Superstor Water Heater Serial Number

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Superstor Ultra Stainless Steel Indirect Water Heater. Heat Transfer Products' years of experience in manufacturing and designing indirect systems have culminated in the development of the SuperStor Ultra Stainless Steel Water Heater. The Ultra's enhanced features and attractive design will provide you with the most advanced appliance available.


  • my 7 year old superstor indirect hot water tank is leaking
    I am wondering is it is normal that I have to replace my 7 year ols superstor SS-30. The cold water intake nipple that is stainless steel and welded into the tank has water weeping through the unused threads. I believe this has happended because the nipple is stainless and the cold water connection is copper pipe. The 2 disimilar metals cause corosan and leaking. Also when no one is using hot water this cold input pipe get hots and when someone uses hot water the pipe is cold, this constant heat and cold expansion and contraction of 2 disimilar metals has a affect. Can some one recomend a reliable indirect hot water tank?
    Thanks for your help.
  • Don
    If the problem is simply water seeping through the threaded connection , you might think about having someone disconnect the connection and re seal the threads. I'm not a huge fan of dielectric unions but that would stop or atleast slow the corrosion between the copper and SS, if indeed there is evidence of electrolisis. As far as hot water bleeding into the cold water inlet, a heat sink would stop some of the transfer.

    Never use dielectric unions or galvanized steel fittings on any domestic
    water connections. Use only copper or brass fittings. Teflon thread
    sealant must be used on all connections.
    This is found on page 8 of the Superstor manual, follow the link below
  • Hey Chuck thanks for the correction
    any idea why that is?? The disclaimer appears to pertain to the Ultra, was it also part of the SS 30 spec's as well?? been looking for manual for SS 30 cant bring one up, only thing available is Ultra, just curious. Thanks

  • > If the problem is simply water seeping through
    > the threaded connection , you might think about
    > having someone disconnect the connection and re
    > seal the threads.
    When I tried to take the connection apart the nipple broke off where the brass tee ends and the stainless steel nipple begins. When you look at the break point you can see the thickness of the nipple on the sides and bottom is 1/8' thick but the top section of the nipple (at 12 O'clock) is less that 1/16' thick. This is what I believe is the electrolisis problem.
    I tried to re-tread the nipple but there is not enough room with my pipe tread tool is to large and there is not enough nipple left.
    Here is a temp fix for this to keep your wife from killing you in your sleep because she has no hot water in the whole house for the weekend because 'YOU' broke the water heater.
    I brought the water supply down and 90 degree elbowed with a 2' long brass 3/4'nipple up to the broken nipple, then went to my favorite AUTO PARTS STORE with a 3/4' nipple and said 'you have any heater hose that this 3/4' pipe will fit in?' They did and I bought a piece. Went home slid the heater hose on the broken nipple and pushed the cold water supply nipple into the other end of the heater hose and put 6 hose clamps on it, and turned on the water ! No leaking at all. I told the wife OK you have hot water now but we should start thinking about buying a new hot water heater.
    I also added a strap around the tank and the cold water supply line because I was worried with it getting hot and cold it might blow off so the strap will keep that from happening.
    I guess from the posts so far that this is not a common problem. I did notice that alot of water heaters have a warranty of 5 years. I noticed AMTROL has a forged brass plate where you connect the water, this looks like a better design, does anyone have any knowledge of this unit?
  • The SS30 is the
    'older' version of the Ultra. I am not sure of the date on the switch of the name.
  • Nice save in a pinch Don
    Sounds as though electrolysis is a possibility. AS far as Indirects go I've had pretty good succes with the Tank in a Tank design such as Tiangle tube or it's sister Weil Mclain.Dielectric's are permitted by these Manufacturer's. Keep in mind electrolysis may not be the problem water content or possibly a grounding issue are other factors as well.
  • Don,
    Check with the warranty department at HTP tomorrow
    1-508-763-8071 ext 150
    Have the model and serial number ready.
    You may still have some warranty left on the tank
  • Don
    I am a Plumbing Contrator and use Super-stor tanks ALL THE TIME.
    We have very little problems with these and would use this tank over a Amtrol every time.
    I would look at the inlet preasure to see if you have excesive preasure which would wear down the thickness of the metal. Possible a poor joint from installation could also be the culprit.
    I can't remember the last leaking Super-Stor we had.
  • Hey Scott,
    I remember the last leaker...I forgot to press a connection. The person servicing the oil burner found it about 4 months after install.
    Don, I'm with Scott on this one. I've only seen one tank returned in the 15 or so years the Super Stor has been around. Follow Chucks advice and call.Nice fix in the jam too! Chris

  • > I am a Plumbing Contrator and use Super-stor
    > tanks ALL THE TIME.
    > We have very little
    > problems with these and would use this tank over
    > a Amtrol every time.
    Hi Scott,
    I am wondering how you hook up the superstor. I have copper water line into brass tee's or elbows onto the stainless steel nipples with pipe dope. I noticed in the ultra superstor installation manual it says teflon must be used on all connections but in the same book for the cold water inlet it say's both tape and pipe dope must be used (page#9). This sounds very strange to me, I think this is the first time I have read somthing like that.
    Also I was talking with a heating supply guy and he said when superstor first came out they had a leaking problem, but then they corrected the problem, do you know anything about this?
  • Someting to check
    I had a problem years ago with a Polaris. Had several leakers and was told to check the tank against ground. I drove a stake into the ground outside and ran a wire from it inside to the tank. Then I checked to see if there were any millivolt difference between them. There was. I then found the electrical panel was grounded to a water pipe instead of an electrical stake. The city changed the incoming water lines to plastic, thus losing it's grounding capabilities. This was causing the leaks because any stray voltage in the house was trying to ground out through the tank, causing electrilysis and leaks. Whew! That one really made my brain hurt figuring it out. Something to check just to make sure. WW
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  • Yes
    Years ago Super-Stor was made with a thru hull fitting that would spin of over tightened. Once the company switched to welding that problem was solved. I can't remember that last leaker we had ( except for poor installation ..Chris ).
    I good joint is a good joint. Pipe dope, teflon, pipe dope and teflon. Its all good, as long as it dos'nt leak. I can not imagine a thread compound effecting electrolosise.
    Call HTP. Good product, good company.
    To Learn More About This Professional, Click Here to Visit Their Ad in 'Find A Professional'
  • you asked about an alternative DHW tank
    and the best warrantee in the industry is offered by Viessmann . The performance is none to shabby either. Ask Paul Polletts about his experiences.

  • Ok, Here is a update on this problem. I called superstor with the serial# on the tank. They said it is lifetime warranty but I have to hire a plumber to do the uninstall and reinstall and the plumber will deal with superstor.
    However, my wife does not want another superstor after all the problems with the first one. I went to a couple of plumbing supplies and found that most indirects are stainless steel. Also talking to one guy and talking about the constant leaking at the cold water input he said 'WICK-IT' . I said what is 'WICK-IT' . He explained that you put pipe dope on the male thread and then wrap a cotton string in the thread . then add more dope and make the connection. when the joint starts to leak the cotton string will swell and stop the leak. It is to late for me since the nipple broke off , but I thought I would share this with you guys.
    I found a indirect water heater tank that looks good to me. It is 'Vaughn top performer' The connecting nipples are brass and the tank is stone lined. The nipples look like they are replacable. The price I got for the 35 gal tank is $660.00 . Does anyone have info on this hot water tank?
  • Check out Ken's article ' Dope'
    It talks about wicking and several other sealents as well as applications and practices.
  • aargh
    'However, my wife does not want another superstor after all the problems with the first one.'
    With all due respect to everyone out there that says things like the above quote, AAAAAAAAAA! Not to poke fun at your wife, however you just had a few experienced proffesionals tell you that these are good units.
    You also know that HTP will warranty the tank.
    In addition you recieved some great info on checking your grounding situation, and to check the chlorine levels. It does not matter whose equipment you use, if the last two items are problems (grounding, and chlorine levels) the same thing may happen again no matter what brand you buy.
    Cosmo Valavanis
    Dependable P.H.C. Inc.

  • > In addition you recieved some great info on
    > checking your grounding situation, and to check
    > the chlorine levels. It does not matter whose
    > equipment you use, if the last two items are
    > problems (grounding, and chlorine levels) the
    > same thing may happen again no matter what brand
    > you buy.
    I forgot to mention I did look for a grounding problem and my electrical box is connected to a ground rod not the water line.
    I am not not going to check the clorine level because I know that my water company adds clorine to the water and that are not going to change it for me.
    From the info posted in this thread clorine and stainless don't work well together and also when you put 2 disimilar metals like stainless steel to copper you get corrosian.
    looking at the vaughn tank it has brass nipples so brass to copper are a good match and stone lined tank is not affected by clorine levels so I think this vaughn tank fits my situation best.
  • Vaughn water heater
    Don check the Vaughn sizing chart to make sure 35 gallons is enough for your water usage, you may want to increase to a larger size. The Vaughn tank is a good quality choice. Good Luck.

  • > Don check the Vaughn sizing chart to make sure 35
    > gallons is enough for your water usage, you may
    > want to increase to a larger size.
    The 30 gal superstor was fine for my needs so the 35 gal vaughn should be more than enough. I heard that when the vaughn first came out the coil was wraped to tight and it had trouble making enough hot water but since then they made a improvment and it makes the correct amount of hot water.
  • Out of the frying pan
    and .....
    Don, the Super-Stor is the better product. You did'nt have problems with the super-stor, you had problems with the install. You had a poor joint not a poor tank. The joint leaked long enough to cause corrosion. We install these tanks all the time and have NO corrosion between the two metals. Viessmann tanks, arguable the best on the market, are a stainless steel tank !!
    Vaughn moved the tightly wound coil from the bottom to the top ??
    You don't have a product problem, you have an install problem.
    My two cents worth.
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  • Super-stor
    We've installed hundreds of ultra tanks. We have never had a leaker. Never! We previously installed a blue tank that looked like a bomb. It was. Changed a dozen bad bombs, got no help from scamtrol. Will never get scammed again by them. Heat Transfer has always been great with any questions or problems. Just never had any with their ultra tank. I think you jumped to a wrong conclusion. Sorry.
  • POST a QUESTION or READ FAQs about how to find out the age of a heating appliance: water heater, heating boiler, heating furnace

InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.

Water heater age decoders, water heater manual sources, all brands:

In addition to details of how to de-code water heater age for all water heater brands we give six ways to determine the age of a water heater. We also discuss the conditions, maintenance, and factors that affect how long a water heater can be expected to last.

Here is a Heating Furnace or Boiler Data Decoding Document that Aids in Determining Water Heater Age. How long should a hot water maker or hot water heater last.

What factors determine the life of a water heater - independent of the water heater's age? DECODING GUIDES for water heater age, 5 data tag decoding documents, books, methods. Geyser & cylinder warranties & water heater life.

We give contact information for water heater, geyser, cylinder, calorifier manufacturers and for water heater installation, operation, & troubleshooting manuals.

Our photo at page top shows an oil fired water heater with a backpressure problem and other safety concerns like a missing extension tube on that relief valve, and maybe a missing draft regulator and perhaps an oil line that is not protected from damage.

We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.

How to Determine the Age of a Water Heater

Article Contents


WATER HEATER AGE DECODING GUIDES - six methods for figuring out the age of a water heater - listed just below:

    1. WATER HEATER DECODING by BRAND - de-coding guide for each water heater brand names + manuals, contact information, alphabetical list
    4. ENERGY LABELS on WATER HEATERS - on the heater
    5. MANUFACTURERS of WATER HEATERS, all countries

Our photo above shows a gas-fired Rheem™ water heater. The label containing the unit's serial number is probably at the water heater top left. The label above the gas control at the water heater bottom typically contains water heater lighting instructions.

[Click to enlarge any image]

Water Heater Age Decoding Charts & Tables: Six ways to find out how old your water heater actually is

1. Specific Water Heater Age Decoding Guides by Brand

Specific Water Heater Age Decoding Guides by Brand are given below in an alphabetical list starting at at WATER HEATER DECODING by BRAND - list of water heater brand names, manuals, contact information, found below in this article.

The data tags (containing the water heater's age) for this heater are hidden by its insulating blanket. Readers who need to determine the age of air conditioning and heat pump equipment should see A/C DATA TAGS.

How can we determine the age of a residential water heater? By looking at and decoding data on the water heater's label.

Nearly all modern water heaters, electric, oil fired, or gas fired, include data tags and stickers that indicate the year and month of manufacture of the water heater.

That doesn't tell you exactly when a water heater was installed in a particular building but it does indicate the age of the water heater itself.

However some manufacturers encode the year and month of manufacture of their water heater in the product's serial number so that the water heater age is not immediately obvious.

2. HVAC Data Tag Decoder Carson Dunlop Associates Technical Reference Guide HVAC & Water Heater Serial Number De-Coding Book

Carson Dunlop Associates Associates provide a most-comprehensive Technical Reference Guide to heating and cooling equipment manufacturers that includes water heater manufacturers.

For an encyclopedic reference including manufacturers, history, contact information, and serial number decoding we recommend this book.

3. Scott LeMarr's Water Heater Age Determination Chart

Scott LeMarr has generously shared his free WATER HEATER AGE DETERMINATION CHART that decodes both furnace age and water heater age from label data.

Scott includes data for many brands of water heater, including hot water systems produced by the manufacturers listed just below. [PDF linked to return here. You can also use the 'BACK' button on your browser to return to this page.


Water heater age is encoded in data on the information label on these water heaters: Ambassador water heaters, American water heaters, ACE water heaters, A.O. Smith water heaters, Apollo, Aqua Temp, Aqua Therm,

Best water heaters, Bosch water heaters,Bradford White, Cafos, Champion, Crosley, Energy Saver, Envirotemp water heaters, GE water heaters,

Glascote water heaters, Golden Knight water heaters, GSW, Hotpoint water heaters, JC Penny, Jetglas, JW or John Wood, Kenmore water heaters (Sears Brand), Lochinvar, Lowes, Mainstream, Maytag water heaters, Montgomery Wards, Knight, P

ermGlas, Reliance water heaters, Revere, Rheem water heaters, Rheem/Rudd/Richmond water heaters, Rinnai, Security, Shamrock water heaters, Standard water heaters, State/Reliance/Sears brand water heaters, Thermo-King, Vanguard water heaters, US Craftsmaster, US Water Heaters, and Whirlpool water heaters.

Mr. LeMarr has also shared his FURNACE AGE DECODING CHART with InspectApedia readers.

You can also use the 'BACK' button on your browser to return to this page.

4. Energy Label on Water Heaters or other Equipment Year May Help Decode the Equipment Age

Our photo (at above left) is from the A.O. Smith EnergySaver water heater in our laboratory. Enlarging this image you will see a date 12/26/02.

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Scott points out that

On occasion there is a yellow 'Energy' label on the unit and at the bottom (sometimes middle) will tell you what ANSI Spec it was built to or it may give you an estimated cost on a particular year. If it reads ANSI Spec 1994 that it would have to be 94 or newer typically these specs come out every 2-3 years.

5. Direct help from water heater manufacturers

For page speed & reader convenience we moved this topic to a separate article - at WATER HEATER COMPANIES by country: Australia, New Zealand, USA, UK etc

6. How to Decode Non-Standard, Unknown Water Heater Serial Numbers & Data Tags to Guess Water Heater Age

Approaches to finding the age of any water heater / cylinder / geyser are given here. If your water heater brand or trader name doesn't appear in the list at WATER HEATER DECODING by BRAND you can use this general data tag decoding guide.

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  1. Find the data tag (as I've discussed above) that will allow us to decode the date of manufacture of the heater.

    Look for reasonable apparent year ecodings in the equipment serial number in format MM YY

    The unit's serial number, MM02-2147713-260 identifies the model and its date of manufacture. The '02' following MM indicates that this unit (in our laboratory) was manufactured in 2002 and the -2 following the MM02- decodes to February.

    In a second water geyser age (cylinder age, water heater age) example, Rheem water heaters provide first the month MM and then the year in the first four digits of the water heater's serial number.

    The label shown here includes 0884 at the beginning of the serial number - August 1984.
    General approach to decoding unfamiliar water heater serial numbers to get water heater date of manufacture

    Typically the manufacturer used

    a two digit month and two digit year,

    1 digit month that used alphabetic characters

    2 digit week (1-52) and 2 digit year

    WITH sometimes a plant ID code in the serial number, typically a letter, separating the numeric or other age and serial number digits.

    So if we have no other data, we look for a pattern that can decode to a reasonable year using those schemas.

    Using Rheem water heaters as an example many, not all, water heaters made by Rheem were sold under other brand names such as Montgomery Ward.

    Modern Rheem water heaters use a 10 digit code:

    MMYYX12345 where X is the plant code and 12345 a consecutive unique ID and of course MM YY are month and year.

  1. Find the installation and service manual for this particular water heater.
    Often the installation guide is stuck behind a pipe or overhead nearby. The manual may include a purchase of sale receipt, handwritten notes on installation date, or even lacking these, it will have a publication date that gives the earliest-likely manufacturing age of this specific heater.
  2. Note the age of the building where the heater (geyser, cylinder) is installed.
  3. Note the age of components used to install the heater such as its wiring and plumbing materials
  4. Contextual clues of water heater age: Note the age and location of the building. That will give us some context. Also note the age of remodeling or building changes.
    Here is an example commentary about water heater age we provided to a reader:

    Your Signature 500 electric water heater (or geyser or cylinder depending on where you live) looks like a much newer installation. I see light colored wood 2x studs (recent construction) and shiny copper electrical wiring at the ground connection at the heater top. Also I see the use of modern red PEX tubing used for the temperature/pressure relief valve discharge tube.

    Certainly the heater could be older than its present wiring and plumbing, but if those are any guide, this is not a very old unit.
    Depending on where you live we could get a more accurate estimation of the year of installation of the water heater plumbing as presently shown even before finding the heater's data tag (which I am betting is there somewhere). PEX surged in popluarity in the U.S. beginning around 2000.

    For example, in the United States, California, one of the last adopters, did not approve the use of PEX (cross-linked polyethylene tubing) for household plumbing until 2007 (on a case by case basis) and not until 2009 for all homes.

    More about PEX plumbing pipes used for building water supply and hot water heating applications can be read at PEX PIPING INFORMATION.

  5. Look around the heater for a water heater service tag, perhaps stuck in a floor joist or on a wall top nearby - that can give an idea when the heater was installed or may give that precise date.

Water Heater Age Decoding, Manufacturers, Manuals, Contact Information by Brand - alphabetical list

While the most complete water heater age de-coding charts and tables are in the book and PDF files we list above, here we also list water heater age or serial number decoding charts for particular water heater brands or products requested by readers.

Because some water heater manufacturers (such as American) produce heaters (or calorifiers or cylinders) sold under multiple brands, you may also find your water heater's age decoder by using your browser's On-Page Search feature (Ctrl-F or CMD-F).

For example, Ace, Apex, Aqua Temp, Aqua-Therm ... Tru-Value, Whirpool and more brand names are all produced and decoded by the American Water Heater Age Decoder.

If your water heater does not appear in this list you are welcome to contact us using the page top or bottom CONTACT link and we'll help reseach your question at no charge.

If the serial number in your water heater data tag format does not match what's given in each of these guides, see DATA TAG DECODING ADVICE for NON-STANDARD DATE CODES.

  • Air Ease Furnaces - see AO SMITH WATER HEATER AGE, MANUALS, ERROR CODES - including ProMax® & ProLine® water heaters
  • Champion Water Heaters - see AMERICAN WATER HEATER
  • Craftsmaster Water Heaters - see AMERICAN WATER HEATER
  • Crosley Water Heaters - see RELIANCE
  • ENVIROTRON ENVIROTEMP WATER HEATER AGE - also see American Water Heaters
  • Glascote Water Heaters - see AO SMITH
  • Golden Knight Water Heaters - see BRADFORD WHITE
  • JC Penney Water Heaters, see STATE WATER HEATERS
  • Kenmore Water Heaters - see either AO SMITH WATER or STATE WATER
  • LOCHINVAR Water Heaters - also see BRADFORD WHITE for decoding codes
  • Lowes Water Heaters - see RHEEM WATER HEATERS
  • Knight Water Heaters - see BRADFORD WHITE
  • Perma-Glas Water Heaters - see AO SMITH WATER

The beautiful antique water heater shown in our photo is mounted on the wall of a kitchen in Dunedin, New Zealand.

  • RANGE BOILERS - from Montgomery Ward and other manufacturers
  • SCHOENBERG ELECTRIC WATER HEATERS - electrical water heater patented by Mjlton H. Shoenberg, San Francisco, CA, assigned to the Shoenberg Electric Appliance Company, of the same place (782,525, February 14, 1905). Milton Schoenberg, Majestic Electric Dev Company, patented an insulated testing plug terminal in 1918. US1255824.
  • Standard Water Heaters - see AMERICAN WATER HEATER
  • Thermo-King Water Heaters - see STATE WATER HEATER
  • Vanguard Water Heaters - see RHEEM WATER
  • WATTS Water Heater Controls - automatic gas shutoff

Aerco Gas Fired Water Heater Manuals

  • Aerco GF-5050 Innovation Series & ReCon Water Heater Venting and Combustion Air Guide [PDF] (2016), retrieved 2017/09/26, original source:
    This manualcoves natural gas modulating condensing water heater models INN600, INN800, INN1060, INN1350, INN1400 and the ReCon 1000 Gas Fired Water Heater.
  • Contact Aerco: Aerco is a WATTS Brand. Aercon International, Inc., 100 Oritani Dr., Blauvelt NY 10913 USA, Website: Tel: 1-800-526-0299 (Technical Support)

American Water Heater Age & Amerian Appliance Manufacturing Water Heater Age & Manuals

Photo: data tag on an American Water Heater, showing serial number 9950123040. This serial number decodes to 1999 week 50.

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Details about American Appliance Manufacturing water heaters are also found at AMERICAN WATER HEATER AGE DECODING

Amtrol Indirect Water Heaters

  • Amtrol BoilerMate™ WH-series INSTALLATION MANUAL [PDF] (2012) AMTROL, 1400 Division Road, West Warwick, RI 02893 T: 401.884.6300 F: 401.885.2567

Also see

A.O. Smith Water Heater Age Decoding

For AO Smith water heaters: Current date code: Ser# YYMM123456

See AO SMITH WATER HEATER AGE & MANUALS for complet details.

Atwood Water Heater Manuals

  • ATWOOD WATER HEATER MANUAL [PDF] (2004) Atwood Mobile, 1120 N. Main St. Elkhart, IN 46514 USA Phone (USA): 800-546-8759 Canada & USA: 800-825-4328retrieved 2018/03/05, original source:
  • ATWOOD WATER HEATER SERVICE MANUAL (2004) [PDF] retrieved 2018/03/06, original source
  • Atwood Bowen Company, division of Dura Automotive, now Dometic, Website:
    Atwood Bowen Company history, Website Excerpts 2018/03/06 from
    Established 1909, Brothers James and Seth Atwood established the Atwood Vacuum Machine Co., Atwood entered the RV market with a trailer coupler in 1936, the screw-type trailer jack in 1949, and surge brakes in 1960. The company grew with strategic purchases of the Bowen Company in 1964, an RV water heater manufacturer .
    In 1985 Atwood was sold to Anderson Industries. In 1986 Atwood Vacuum Machine Co. changed its name to Atwood Industries Inc.
    In 1997 Excel Industries Inc.(Elkhart, Indiana) purchased Atwood Industries. In 1999 Dura Automotive Systems Inc. purchased Excel and Atwood Mobile Products became a division of Dura Automotive.

Bock Water Heaters

Photo: an abandoned, leaky Bock oil fired water heater in a New York home.

  • BOCK WATER HEATER INSTALLATION & OPERATION MANUAL [PDF] (2016) Models LCE6, LCE12, LCE20, LCE30, LCE40, LCE50, including wiring diagrams.
    Bock Water Heaters, Inc. 110 South Dickinson Street, Madison, WI 53703 USA, Tel: 608-257-2225 Website:, retrieved 2018/03/05, original source:
  • BOCK WATER HEATERS, ENGINEERING MANUAL [PDF] retrieved 2018/03/05, original source:
  • BOCK WATER HEATER VENTING SPECIFICATIONS [PDF] , retrieved 2018/11/21, original source:
  • BOCK OIL FIRED WATER HEATER MANUAL 32-51E [PDF] Models 32E, 32EC, 32PP, 32PPC, 33E, 33PP, 40E, 40PP, 50ES, 50ESC, 51E,
    51EC, 51PP, 51PPC, 71E, 120E
  • BOCK OIL FIRED WATER HEATERS MANUAL 72-541E [PDF] Models 72E, 73E, 190E, 241E, 361E, 541E

Bosch Water Heater Technical Support & Water Heater Manuals

  • Bosch Technical Support [USA]: Bosch Thermotechnology, Customer Service Operating Hours Monday - Thursday, 8am - 6pm EST Friday, 8am - 5pm EST Tel: 800-283-3787 Fax: 603-965-7567 Tech Support Fax: 603-965-7581
    Bosch Tankless & Heat Pump Water Heaters General Inquiries: 1-866-642-3198 Technical Support: 1-800-283-3787
    Website: - see this page of Troubleshooting guides: that provides troubleshooting guides for some but not all Bosch water heating products.
    • Bosch Greentherm 9000
    • Bosch Therm C 1210ES
    • Bosch Greentherm C 1050 ES
    • Bosch Greentherm C 950 ES
    • Bosch Therm 940 ES
    • Bosch Therm 830 ES
  • BOSCH MiniMAXX CALENTADOR ESTANCOS de GAS, MANUAL 6720813112 [PDF] (2017/07) - installation & operation
  • BOSCH ProTankless GWH-635-ES Indoor Model MANUAL [PDF] - Bosch 635-ES-N (natural gas) & Bosch 635-ES-L (LP gas)
  • Bosch Optiflow Gas Water Heater INSTALLATION MANUAL, GWH16/20/26 3 CT E23/31 F6L S2406, [PDF] retrieved 2017/04/28, original source:
  • Bosch Optiflow Gas Water Heater OPERATION MANUAL, GWH16/20/26 3 CT E23/31 F6L S2405 [PDF] op cit.
  • Bosch Optiflow Professional Gas Water Heaters GWH 12/16/20 [PDF] op. cit.
  • Bosch Tronic Electric Water Heater Tronic 6000C MANUAL - [PDF] Models WH17/WH27
  • Bosch Tronic Electric Water Heater 5000C Pro MANUAL [PDF]
  • Bosch Tronic Electric Water Heater 3000C MANUAL [PDF]
  • Bosch Powerstar Electric Water Heaters AE 115/125 MANUAL [PDF] - Serial numnber 108 & higher

Also see

  • Bosch NOISE, WATER HEATER WHISTLE diagnosis & repair

Bowen Gas Water Heaters, Atwood Bowen, Dometic

  • Atwood Bowen Company, division of Dura Automotive, now Dometic, Website:
  • BOWEN GAS WATER HEATERS MANUAL, G-106-T, G110-T, G117-M, G-130-M [PDF] Atwood Bowen Company, Atwood Mobile Products, Rockford, Illinois, retrieved 2018/03/05 original source:

Bradford White Water Heater Age Decoding Guide & JetGlas Water Heater Age

Bradford White water heater age is encloded as two letters in water heater's serial number using an alphabetic code for year and month as follows:

Current Bradford White water heater date code format: YM234567...

See complete details and decoding tables for Bradford White water heaters or calorifiers at BRADFORD WHITE WATER HEATER AGE DECODER

Buderus Indirect Fired Water Heater Manuals

  • Buderus contact information: See BOSCH WATER HEATER AGE, MANUALS

Burnham indirect water heaters

  • Contact: Burnham Commercial Boilers P.O. Box 3939 Lancaster, PA 17604 Tel: 888.791.3790 Email: [email protected] Website:

Cal-O-Rex Gas Fired Water Heaters

Cal-O-Rex water heaters, gas fired, are widely sold in Mexico

[More data & citation in process, photos invited- Ed.] Below: a Cal-O-Rex gas water heater data tag.

Cal-O-Rex Dura-Glas is another brand used by this company.

Chrysler AirTemp Water Heater Age Decoding Guide

Chrysler Air Temp Water Heater Age Query: (Mar 16, 2012) Dan said: Need to find age of Chrysler Airtemp Gas Furnace: Model #4208-10, Ser #'s hard to read.

Could be: Ser# 00584865, 06584865, or 0G584865

Reply: best guess 1970.

From Carson Dunlop Associates Associates comprehensive Technical Reference Guide

Chrysler Air Temp Products: see AirTemp and Fedders. In HVAC serial numbers the first digit is a key to the year of manufacture beginning with 1970.

So SN# 42599229 would de-code to be manufactured in 1974

Contact information for Chrysler Air Temp

  • We have not found a useful current (2015) contact reference for Chrysler Air Temp products. Chrysler Air Temp was sold by Chrysler and AirTemp was purchased by Fedders Corporation in the 1970's. Fedders subsequently sold many of its assets to focus on room air conditioners under brands Airtemp, Climatrol and Fedders. Those products are currently produced in China.

Cinsa Water Heaters

The Cinsa water heater shown in our photo was installed outdoors in Uruapan, Mexico. [Details and data tag photos needed]

Electric-Weld Gas-Fired Antique Water Heaters

[Citations needed - Ed.]

Edwin Ruud, a Norwegian-American engineer, invented the first electric arc-welded steel cylinder water heater in 1889 in Pittsburg, Pennsylvania. Ruud is credited with the inventionof the electric water heater in that year.


Envirotron - Envi-ro-Temp Water Heater Age Decoding Guide

Envirotron Water Heater Age Query: (Nov 7, 2011) Jackie said: I need warranty information also. Product #0726021 Serial #0214115365 model #GIF4034T3NV . It's an Envirotemp water heater. Need to know if it's still under warranty.

Reply: Year 2002, week 14. Details are


Contact Information for Envirotron or Enviro-Temp water heaters:

  • Envirotron or Enviro-Temp water heaters are now an American Water Heater product.
  • See AMERICAN WATER HEATER AGE DECODING for contact information .

Everhot Water Heaters, Boilers, Tankless Heaters

Everhot tankless water heaters are still sold, as Everhot, now in Waterville MA, is a division of Therma-Flow
PHONE/FAX: 617-924-3877 • FAX: 617-924-7271 • TOLL FREE PHONE: 1-800-654-8045

E-MAIL /WEB SITE: [email protected] • WEB SITE:

FACTORY: Therma-Flow, Inc. • 191 Arlington Street • Watertown, MA 02472 • MAIL: P.O. Box 416 • Watertown, MA 02471-0416
Here is a link to current Everhot tankless water heater information: this will help you understand your hot water system.
here is the company's pertinent web page

Fairbanks Morse Water Heaters & Appliances

Question: Age & manual wanted for Fairbanks Morse water heater (electric)

2019/03/22 Rene-Philippe Hebert said:

Hi, I'm looking for the age of a Fairbanks Morse water heater model WE39305SE serial 139079-6005, thanks.



I'm researching further but have not (yet) found a Fairbanks Morse water heater age key. From your serial number my guess would be 1979.

Fairbanks Morse & Co. produced a remarkable range of products from radios and pumps and water heaters to washing machines and railroad locomotives.

Fairbanks Morse & Co, (Chicago IL USA) with offices in Australia, England, and in many cities across the U.S. and Canada, starting as a scale manufacturer, was a large 20th century manufacturer of heavy equipment including railroad engines (12-cylinder Fairbanks-Morse Model 38D engine) and smaller engines such as the Fairbanks Morse 2,3, and 6 horsepower 'Z' throttling governor engines.

Wikipedia's current article on Fairbanks Morse cites 3 entities:
Fairbanks Scales is a privately owned company in Kansas City, Missouri, that manufactures scales.

Fairbanks Morse Engine (FME), a subsidiary of EnPro Industries, is a company based in Beloit, Wisconsin, that manufactures and services engines. - Website:

Fairbanks Morse Pumps is a part of Pentair Water in Kansas City, Kansas, and manufactures pumps.

Currently (as recently as 2019) Fairbanks Morse Pumps were produced under the Pentair name (well pumps & ejector pumps).

It would be helpful if you could add an image of your Fairbanks Morse water heater and a closeup of each of its data tags or labels - one image per comment.

The only image of a Fairbanks Morse water heater we've found is from this 1946 advertisement

Reader follow-up:

Rene-Philippe Hebert said:

Here what I got. The machine still working!

Ford Products Water Heater Age, Company Information, History, & Manuals


Fowler Electric Water Heater Age Decoding


General Electric Forced Air Furnace & Water Heater Age De-Coding Guide

GE water heater data tag example

A typical GE water heater serial number is formatted as GE AWWYYnnnnn

Details of decoding GE or General Electric water heater serial numbers to obtain the date of manufacture are


Giant Water Heater Age, Data Tags, & Manuals

Data tag details: pending; images of Giant water heater data tag wanted. Use our page bottom or top CONTACT link - Ed.

  • GIANT ELECTRIC WATER HEATER MANUAL [PDF] Giant Water Heaters, 40 Avenue Lesage, Montreal-East, Quebec, Canada H1B 5H3 Tel: (514) 645-8893 1-800-363-9354 website:
    Giant is a Canadian manufacturer of residential, light duty commercial and commercial, electric, gas and oil-fired water heaters.
  • Giant_Water_Heater_Manual_GI-IM017En.pdf [PDF about 16MB]

Question: where to find Giant brand water heater manuals

I am not sure I have come to the right place however are you able to tell me where I could find a 2006 Giant Electric Water Heater Manual for Model 172ETE-3F5m? - Anon in Toronto, Ontario, by private email 2016/07/27


Giant electric water heaters are manufactured by

Usines Giant Factories, Inc., 40 Avenue Lesage Montreal-East, Quebec, Canada H1B 5H3 Tel: 1-800-363-9354 Website:

The company has a 'literature request' page at

The Giant 172 series water heaters, aka 'Super Cascade' are described by and by

The company's engineering data sheet tells us that a Giant water heater Model 172ETE - 3F5m is not listed but the company currently lists a 172ETE-3F7M as a 74 gallon (279L) or 61 imperial gallon electric water heater using 4500W 240V.

Here is the company's link to the Installation Manual for the Giant 17E heaters:

I am attaching a link to a typical Giant electric water heater installation and operation manual

GSW Hot Water Heater Age De-Coding Procedure - Quel âge a votre chauffe-eau?

The age of a GSW current water heater is coded as YY MM in the first four digits of the serial number, after ignoring any alphabetic letter that starts the serial no. Using the company's example:

GSW heater S/N U0106413635 was manufactured in 2001, June

  • Contact GSW: GSW Water Heaters 599 Hill Street West Fergus, Ontario, Canada N1M 2X1 T 1.888.479.8324 Website: Tel: 519 843 1610

See ANTHES BOILER / FURNACE AGE for more discussion of age decoding and finding manuals for Anthes

See also JOHN WOOD Co. Ltd.

GSW Water Heater Age Query: (Mar 1, 2013) Lee Harding said: I'm trying to determine the age of my GSW hot water heater. Model 6G505DE1
Serial # 50704 535391. I can't tell from these numbers.

Reply: best guess: week 50 of year 1970

Normally the first two digits of the serial number give the GSW heater's year of manufacture. Your serial numbers don't match this system, perhaps because of wear or smearing or heater particulars.

From your serial number we'd guess week 50 year 1970 - which seems a bit antique. Re-check that you're really seeing a 50 in the first two digit positions.

For GSW water heaters manufactured before 2008 the heater the age is encoded as the first four numeric digits of the serial number as two digits of year followed by two digits of month. Ignore any leading alphabetic character.


For GSW water heaters produced after 2008 the water heater age is also encoded in the first four digits of the serial number but as two digits of year followed by a two-digit week number (weeks 01-52).


Contact information Details & Manuals for GSW Water Heaters

Superstor Water Heater Serial Number

From GSW's website (2017 & 2018), GSW produces for-sale as well as rental-water heaters in Canada.

  • GSW- Canada: GSW Water Heaters599 Hill Street WestFergus, Ontario, Canada N1M 2X1T 1.888.479.8324F 519.787.5500 Website:
    Vous pouvez également nous appeler au 1-888-GSW-TECH (479-8324).
  • GSW- USA: GSW Inc., Racine WI, Tel: 414-637-6521

Haier Water Heaters, Appliances Manuals, Service, Parts - GE

In 2016 General Electric sold its appliance business to Haier, a Chinese home appliance manufacturer for $5.4 billion. After 2016 GE no longer provides lighting, home appliances, cooktops, ranges, refrigerators, nor water heaters.

  • Contact: General Electric Appliances, 3136 Easton Turnpike Fairfield, CT 06431 USA, Tel: 1 800-432-2737 Website:
    GE Appliances Consumer Relations PO Box 1780 Rapid City, SD 57709 USA
    Haier Appliances, Haier Appliances Consumer Relations PO BOX 1780 Rapid City, SD 57709 USA, Tel: 1-877-337-3639 Website:
    Haier Canada: 1-877-470-9174 (product support)

Hi Test Hoyt Water Heater Age De-Coding Tips

Hoyt Water Heater Age Query: (Nov 5, 2012) Alexandra said: I am trying to find the age of my Hi Test Hoyt water heater. The Serial is SN A87RNH1373190, model A40HM

Reply: best guess 1987. Details along with contact information for Hoyt water heaters are at HOYT WATER HEATER AGE

Hotpoint Water Heater Data Tag Decoding & Water Heater Age

Hotpoint water heaters prior to about 1980 such as those bearing the data tag shown above use serial numbers in the format AAAWWYY

Hotpoint water heater Serial Number decoding to obtain Hotpoint water heater age and links for Hotpoint water manuals are given in detail at HOTPOINT WATER HEATER AGE & MANUALS

Hoytt Water Heaters


HTP Water Heater Age & Manuals

  • HTP Water Heaters, 120 Braley Rd. P.O. Box 429 East Freetown, MA 02717-0429USA, Website: Founded 1974,
  • HTP OIL FIRED WATER HEATER INSTALLATION MANUAL [PDF] retrieved 2018/05/04, HTP Products, 120 Braley Rd. P.O. Box 429 East Freetown, MA 02717-0429 USA, Website:, original source:
  • HTP OIL FIRED WATER HEATER INSTALLATION MANUAL [PDF] retrieved 2018/03/05 original source:
  • HTP (Heat Transfer Products) Superstor Ultra INSTALLATION MANUAL [PDF] HTP, Inc Corporate Office, 272 Duchaine Boulevard, New Bedford, MA 02745 USA Tel: 800 323 9651 E-mail: [email protected] HTP Technical Support: 800-323-9651

Hubbell Water Heater Manuals & Contact Information

    Stratford, CT 06615-0288 USA Tel: (203) 378-2659 Website: 2018/02/27, original source:

Hydraulics Institute Heaters

Hydraulics encodes the date of manufacture as two digits of week and two of year in positions 1-4 of the serial number


Intertherm Water Heater Age Decoding Guide

Intertherm Water Heater Age Query: Hi, can you tell me the date an Intertherm water heater was made?
Model #IHMS960E4 - Serial #K07433029

Reply: best guess 1974. Details and contact information for Intertherm water heaters are


JetGlas Water Heater Age & Manuals

Jetglas® Water Heater Age Decoder

YMnnnnnnn where the first character encodes the year in a 20-year cycle running as follows

First character Y = Year of manufacture

F = 1989, G = 1990, H = 1991, J = 1992, K = 1993, L = 1994, M = 1995, N = 1996, O is not used

P = 1997, Q & R not used, S = 1998, T = 1999, U-V not used, W = 2000, X = 2001. Y = 2002, Z = 2003

A = 2004, B = 2005, C = 2006, D = 2007, E = 2008, F = 2009, G = 2010, H = 2011

I = 2012, J = 2013, K = 2014, L = 2015, M = 2016, N = 2017, P = 2018, S = 2019

Second character M = Month of Manufacture

A=January to M = December, with the letter 'I' not used

Example: Serial No: LF3337645 (Amber PA plant) from reader Cecil Lockyer

L = either 2015 or 1994

F = June

  • D&B Distributing has claimed the Jetglas name and put up a website at
  • See more details about the production of Jetglas water heaters at BRADFORD WHITE WATER HEATER AGE DECODER

John Wood Water Heaters Age & Manuals JW Water Heaters


Lochinvar Water Heater Age & Manuals

Lochinvar sold water heaters under these brands: Lochinvar, Energy Saver water heaters, Golden Knight Water Heaters, and Knight Water Heaters.

YM123456 where Y encodes the year equating A to 1964 or 1984 or 2004 etc. and M encodes the month using A - N for January - December (the letters I O Q R U V are not used in these coding schemes)

For more about Lochinvar Water Heaters -


Marathon water heater age decoding from serial number

On Marathon water heaters the age is encoded as the first four digits of the serial number.


Contact Information for Marathon water heaters

Marathon water heaters are currently (2015) a Rheem product.

  • Marathon - Rheem Water Heaters, Website: (this is a contact-form page)

Montgomery Ward water heater serial numbers in format Ser# TE22780

Details and contact information for Wards water heaters are


Navien Tankless Water Heater AGe, Manuals, Instructions

  • Contact: Navien Heater Company, Website: Tel: 1-800-519-8794
  • NAVIEN CH WATER HEATER SERVICE MANUAL [PDF] This manual includes all of the Navien water heater error codes, beginning on p. 54 continuing through p. 107

On 2019-07-27 by (mod) - Vent clearance distances for Navien condensing water heaters CH series

The manual for your Navien CH180 Tankless water heater is available from the company at the link I gave earlier, or also here at InspectApedia at NAVIEN WATER HEATERS

Navien notes that all of its clearance requriements are in accordance with ANSI Z21.10.3 and the National Fuel Gas Code ANSI Z223.1 / NFPA 54 and CGA B149.1 National Gas and Propane Installation Code. See the illustration here and the table below.
The vent clearance distances for the heater are given on p. 35 in the manual; I'll post two clips here that give distances.

This Q&A were posted originally at GAS APPLIANCE DIRECT VENT CLEARANCES

On 2019-06-26 by (mod) -

Thanks for the added detail - let's both see what we can find on this Navien model.

The 'T Love' is NOT a Navien water heater model name, part number nor term it's a name associated with an excellent plumbing information website by Terry Love.

Your Water Heaterr models include a Navien CH 180 Gas Fired Water Heater and a Navien CH 210 Gas Fired Water Heater

On 2019-06-25 by Anonymous

I didn't realize auto type somehow changed love to loves. :) These are 2013 Navien T love Ch 180's on left and right. The middle is a 2013 Navien T love CH 210.

On 2019-06-21 by (mod) - Safety of Navien CH water heater vents that may be snow-covered

A good place to start is with the installation instructions from the manufacturer.
Navien Heater Company has a website with plenty of resources and product instruction downloads - you'll need your specific product type, name, model number, and on occasion, serial number.

Navien says the heater vent has to be at least 7' above ground, but where there is snow cover you need to be above the top of the maximum anticipated snow depth OR the vent exits need to be protected from being covered by snow by an external means.

Watch out: any direct vent heating appliance whose air intake or exhaust can be blocked by snow or anything else is potentially unsafe and risks fatal carbon monoxide poisoning of building occupants.

On 2019-06-21 by Joe

Here is the direct vent systems that the Kalamazoo, MI city is finding no problem with despite smelling the exhaust inside at times. Especially in winter when these were all but buried.

We can get up to 2 ft snow here at times. They are saying the clearances are accurate, but we are finding they are not. These 3 systems are Navien T loves. 2 are CH 180s and the middle is a CH 210.

All are common vented intake from a window well you will see in pictures(bottom left).

Bushes may be the problem as well. Furthermore the bottom of the vent exhausts come out of the building at ground level behind the bushes.

Being this does not fit the direct venting specifications what kind of setup would this be classified?

What are your thoughts as we seem to be hitting road blocks getting the city to see there is a problem here.

Noritz Tankless Water Heater Age, Manuals, Error Codes


Optimus Water Heaters, Age, Manuals

This Optimus LP gas water heater is installed outside at Rio-Bec Dreams in Campeche, Yucatan, Mexcio.

Details, data tag photos, manual sources & citations in process. - Ed.

Paloma Water Heater Age Decode

Shown here, the data tag from a Paloma water heater and in a second image, a closer look at the Paloma water heater's serial number.

[Click to enlarge any image]

The serial number for this Paloma water heater is given as RMLN0109J000472

We decode this Paloma water heater serial number as RMLNMMYYP123456or January 2009


Peter Cocks Ltd. Water Heaters, New Zealand

Peter Cocks Ltd. electric water heaters like the unit shown here are produce in Christchurch New Zealand. This is a low-pressure thermal storage water heater whose data tag indicates that the unit was manufactured in 1981.

[Click to enlarge any image]

As you can see from our photo below, this Peter Cocks Ltd. electric water heater uses a single heating element.

Reliance Water Heater Manuals & Age Decoding

Reliance Water Heater company produces both gas and electric water heaters for which we give manuals and details now found at RELIANCE WATER HEATER AGE & MANUALS

Rheem water heater serial number decoding

MMYYX12345 where X is the plant code and 12345 a consecutive unique ID and of course MMYY are month and year.

We discuss Rheem-manufactured water heater date codes in detail at RHEEM WATER HEATERS & HEATER AGE

Richmond Water Heater Age Decoder

Richmond water heaters include the water heater's month and year of manufacture in the first four digits of the serial number as in this example.


Rinnai Furnaces & Water Heater Manuals, Error Codes, Age Decoder


Ruud Water Heater Age Decoding & manuals


Sears Kenmore Water Heater Age Decoding Guide


Below: Data Tag from a Sears Kenmore water heater. [Click to enlarge any image]

The serial number onthis Sears Kenmore natural gas fired water heater is given as 1112A011137 and Model No. 153.331840

Current date code: Ser# YYMM123456 *using A.O. Smith water heater codes indicates that this Kenmore water heater was produced in December 2011.

State Water Heater Age Decoding Information

State water heaters, produced by State Industries, usually encode the age in the first three positions of the State water heater serial number as MYYnnnn

Where M is a one-letter month code, encoded corresponding to A = January through M = December and the second two digits are the numeric year.

See STATE WATER HEATER AGE for State water heater age determination, serial number decoding, and for State water heater manuals.

Superheat Water Heaters, New Zealand

Superheat electric water heaters like the one shown here are typically installed in a utility closet where space is so tight that we found it almost impossible to photograph the water heater's data tag.

[Click to enlarge any image]

The data tag shows that this Superheat is a 300L water heater manufactured in 2009.

Takagi Water Heater Manuals, Troubleshooting Guides, Error Codes Contacts (also AO Smith)

See this separate article:

U.S. Craftsmaster Water Heater Age Decoder

U.S. Craftsmaster water heater age is usually encoded in the first four digits of the heater's serial number as in this example:


Where WW is the week number (weeks 01 through 52) and of course YY indicates the last two digits of the year of manufacture.

U.S. Craftsmaster is an indpendent water heater manufacturer whose heaters have been sold under the following trade names or brand names

Ace Water Heaters, Ace Hardware Water Heaters, American Hardware Water Heaters, America's Best Water Heaters, Apex Water Heaters, Aqua Temp Water Heaters, Aqua Therm Water Heaters, Aquamatic Water Heaters,

Best Water Heaters, Best Deluxe Water Heaters, Craftmaster Water Heaters, De-Limer Water Heaters, Deluxe, Eagle Water Heaters, The Earl's Energy Conservation Water Heater, The Earl's Energy Saver Plus Water Heaters, Envirotemp Water Heaters,

Four Most Water Heaters, Hotmaster Water Heaters, Hotstream Water Heaters, King-Kleen Water Heaters, King-Line Water Heaters, Master Plumber Water Heaters, Nationaline Water Heaters, Neptune Water Heaters,

Penquin Water Heaters, Prestige Water Heaters, Pro-Line Water Heaters, Pro-Line Plus Water Heaters, Quaker Water Heaters, Quick-Flo Water Heaters, Raywall Water Heaters, Revere Water Heaters, Riviera Water Heaters,

Sands Water Heaters, Sentinal Water Heaters, Sentinel Water Heaters, Servistar Water Heaters, Shamrock Water Heaters, Special Deluxe Water Heaters, Standard Water Heaters, Supereagle Water Heaters, Super-Flo Water Heaters, Supreme Water Heaters, Sure-Fire Water Heaters,

Thoro-Clean Water Heaters, True-Test Water Heaters, Tru Value Water Heaters, Tru Value Hardware Water Heaters, U.S. Craftmaster Water Heaters, U.S. Supply Water Heaters, Whirlpool Water Heaters, XCL Energy Saver Water Heaters

Watts Controls for Water Heaters

Details about automatic gas-shutoffs on gas water heaters are


[Click to enlarge any image]

  • Watts SERIES 201-5 AUTOMATIC GAS SHUTOFF VALVES [PDF] (2005) used for gas water heaters retrieved 2017/.11/17 original source:
    Description: Series 210-5 automatic gas shutoff valves are positive-acting energyshutoff for the emergency temperature protection of gas water heaters.They are self-contained devices independent of all other operating controls.
    They provide protection against overheating water in the domestichot water supply heating systems by automatically shutting off the gassupply to the heater in the event that the water temperature reaches210°F (99°C). Series 210-5 must be manually reset in order to resumeheater service.
    This feature serves as a warning of malfunctioning of thenormal operating controls. Manual resetting is easily done and does notrequire dismantling or replacing of any part of the valve. See “ResetButton” feature.
    This gas shutoff differs from other contemporary design in that Wattsengineers have embodied the time tested Watts auto-thermatic thermalactuator principle along with a snap-acting trip latch which closes thevalve at a definite controlled temperature.
  • Contact: Watts Regulator, 815 Chestnut St., No. Andover, MA 01845-6098 USA Website:
    or Watts Regulator, : 5435 North Service Rd., Burlington, ONT. L7L 5H7 Canada Website

Weil McLain Heater Age De-Coding Guide

Weil McLain Heater Age Query: (Oct 25, 2012) carl said: how do you find an age of a Weil Mclain GV 3 Gold serial no cp 3406659

Reply: this looks like you have sent us a heating boiler brand and model number not a domestic water heater. Quoting product literature:

The Weil McLain GV boiler is a high efficiency, gas-fired direct vent water boiler with cast iron sections.
Using sealed combustion technology, the boiler reduces energy usage by eliminating air infiltration. The GV boiler is easy to install and service, and is useful for a wide variety of applications including residential, light commercial, multiple boilers, indirect-fired water heating, and radiant heating.

From Carson Dunlop Associates Associates Technical Reference Guide, the most complete HVAC and water heater age decoding guide I've got (provided courtesy of CDA), Weil McLain heating boiler serial numbers beginning with 34nnnn were manufactured between 1998 and 2000.

This article and comment page are for water heaters. For details on age determination for heating boilers & furances


Watch out: for other Weil McLain boiler numbers one needs to consult the Guide cited above, as the encoding of serial numbers does not afford a formulaic de-code procedure. For example Weil McLain boiler serial numbers beginning with 32nnnnn were made beginning in 1997.

Contact information for Weil McLain heating equipment

  • Weil-McLain 500 Blaine Street Michigan City, IN 46360 800-368-2492; local 219-879-6561 You may also email us at [email protected]

Westinghouse Water Heater Manuals & Contact Information

  • WESTINGHOUSE ELECTRIC WATER HEATER MANUAL [PDF] retrieved 2018/02/27, original source:
  • Westinghouse water heaters contact: Westinghouse Water Heating, 272 Duchaine Boulevard, New Bedford, MA 02745 USA Customer Service: (774) 417-6000 Technical Support: (774) 417-6000, option 2 Email: [email protected] Website:

Whirlpool Water Heater Manuals & Contact Information

  • WHIRLPOOL RESIDENTIAL GAS WATER HEATER MANUAL [PDF] (2015) retrieved 2018/03/05, original source:
  • Whirlpool water heaters are manufactured under license by American Water Heater Company, Tennessee, and a limited warranty is provided by the manufacturer. See AMERICAN WATER HEATER

Williamson Water Heater Manuals

  • Williamson-Thermopride WT INDIRECT-FIRED WATER HEATER MANUAL [PDF] retrieved 2017/11/27 original source
  • WILLIAMSON-THERMOFLO FreeStyle Wall-Mount Gas-Fired CONDENSING BOILER MANUAL [PDF] Models Combi & Heat-Only # 80/120/155 for domestic hot water and/or central heating
  • Also see company contact information found at WILLIAMSON Manuals Williamson Thermoflo / W-T Manufacturing

What Determines Water Heater Life?

Home inspectors typically expect a generic water heater to last about ten years. However all of us have found 20 year old models still going strong, while on occasion a newer model fails early.

Details about water heater life expectancy: We have expanded and moved this topic


What are the Typical Terms of Water Heater Warranties

Type of water heater tank and water heater warranty - modern 'glass lined' water tanks are coated to resist corrosion. The manufacturer's warranty is a clue to how long the company expects their water heater tank to last.
Typical water heater warranty periods for a water heater installed for use by a single family are 6-years, 9-years, or 12-years.

But beware: if the water heater tank leaks and fails before the end of the warranty period, if the system has not been properly installed or maintained the warranty may be void.

Water heater warranties typically indicate that the tank is warranted against leaks due to rust, corrosion, or chemical action of the water but the warranty will exclude warranty coverage for the geyser or water heater for

  • a tank failure due to scale
  • or possibly by failure to maintain the water heater as the manufacturer requires
  • or possibly by using the water heater in a manner not intended, such as for home heating
    The warranty period of a water heater may be encoded in its model or serial number.
    For example Lochnivar water heaters include a model number prefix that determines whether the heater is warranted for six years or for ten years. If the water heater is in any other use than one-family residential, the heater is warranted for one-year on parts and three years on the tank itself.

Water Heater Performance Data

  • Farahan, Ebrahim, 'RESIDENTIAL ELECTRIC & GAS WATER HEATERS', [PDF] Oak Ridge National Laoratory, US Energy Researcy & Development Administration, for Argonne National Laboratory, USEDA, retrieved 2017/11/17, original source:
    Abstract: This report provides performance data for electric and gas-fired residential water heaters. [Water heater] Performance characteristics investigated include:
    [water heater] Unit full-load
    [water heater] Unit part-load
    Overall [water heater] efficiencies
    Detailed examination of [water heater] standby losses
    Also included: brief discussions of energy-conserving options [for water heaters] such as lowering thermostat settings, increasing insulatin thickness, and reducing pilot rate.


Continue reading at WATER HEATER LIFE or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.

Or see WATER HEATER AGE & MANUALS FAQs - questions & answers posted originally on this page.

Or see these

Water Heater Articles

Super Stor Ultra Water Heater

  • WATER HEATER AGE DECODING GUIDES - six methods for figuring out the age of a water heater - listed just below:
      1. WATER HEATER DECODING by BRAND - de-coding guide for each water heater brand names + manuals, contact information, alphabetical list
      4. ENERGY LABELS on WATER HEATERS - on the heater
      5. MANUFACTURERS of WATER HEATERS, all countries

Suggested citation for this web page

WATER HEATER AGE & MANUALS at - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.


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Technical Reviewers & References

  • Scott C. LeMarr has provided his file of keys to decode Water Heater Age from the data provided on the manufacturer's equipment labels. Mr. LeMarr is a professional home inspector, Certified Professional Inspector/President, MASTER Indoor Environmental Specialist (MIES). Vice President of Wisconsin NACHI. He and his company, Honest Home Inspections, LLC. can be reached at 262-424-5587 or by email to [email protected]
  • Carson Dunlop, Associates, Toronto, have provided us with (and we recommend)Carson Dunlop Weldon & Associates' Technical Reference Guide to manufacturer's model and serial number information for heating and cooling equipment ($69.00 U.S.). Technical Reference Guide, Carson Dunlop Weldon & Associates, Ltd., 120 Carlton St. Suite 407, Toronto, Ontario, M5A 4K2 Canada, ISBN 1-895585-90-2 165pp.
  • Mark Cramer Inspection Services Mark Cramer, Tampa Florida, Mr. Cramer is a past president of ASHI, the American Society of Home Inspectors and is a Florida home inspector and home inspection educator. Mr. Cramer serves on the ASHI Home Inspection Standards. Contact Mark Cramer at: 727-595-4211 [email protected]
  • John Cranor is an ASHI member and a home inspector (The House Whisperer) is located in Glen Allen, VA 23060. He is also a contributor to in several technical areas such as plumbing and appliances (dryer vents). Contact Mr. Cranor at 804-747-7747 or by Email: [email protected]
  • G.E. Water Heater warranties and other water heater information can be found online at
  • Lochnivar or some vendors of Lochnivar water heaters provide an online copy of its water heater warranty (01/26/2009)

Books & Articles on Building & Environmental Inspection, Testing, Diagnosis, & Repair

  • Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the InspectAPedia Bookstore. Also see our Book Reviews - InspectAPedia.
  • Carbon Monoxide Gas Toxicity, exposure limits, poisoning symptoms, and inspecting buildings for CO hazards
  • ...
  • Carson, Dunlop & Associates Ltd., 120 Carlton Street Suite 407, Toronto ON M5A 4K2. Tel: (416) 964-9415 1-800-268-7070 Email: [email protected] The firm provides professional home inspection services & home inspection education & publications. Alan Carson is a past president of ASHI, the American Society of Home Inspectors. Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The Home Reference Book & illustrations from The Illustrated Home. Carson Dunlop Associates' provides extensive home inspection education and report writing material.
    • The Illustrated Home illustrates construction details and building components, a reference for owners & inspectors.
      Special Offer: For a 5% discount on any number of copies of the Illustrated Home purchased as a single order Enter INSPECTAILL in the order payment page 'Promo/Redemption' space.
    • TECHNICAL REFERENCE GUIDE to manufacturer's model and serial number information for heating and cooling equipment, useful for determining the age of heating boilers, furnaces, water heaters is provided by Carson Dunlop, Associates, Toronto - Carson Dunlop Weldon & Associates
      Special Offer: Carson Dunlop Associates offers InspectAPedia readers in the U.S.A. a 5% discount on any number of copies of the Technical Reference Guide purchased as a single order. Just enter INSPECTATRG in the order payment page 'Promo/Redemption' space.
  • The Home Reference Book - the Encyclopedia of Homes, Carson Dunlop & Associates, Toronto, Ontario, 25th Ed., 2012, is a bound volume of more than 450 illustrated pages that assist home inspectors and home owners in the inspection and detection of problems on buildings. The text is intended as a reference guide to help building owners operate and maintain their home effectively. Field inspection worksheets are included at the back of the volume.
    Special Offer
    : For a 10% discount on any number of copies of the Home Reference Book purchased as a single order. Enter INSPECTAHRB in the order payment page 'Promo/Redemption' space. editor Daniel Friedman is a contributing author.
    Or choose the The Home Reference eBook for PCs, Macs, Kindle, iPad, iPhone, or Android Smart Phones.
    Special Offer
    : For a 5% discount on any number of copies of the Home Reference eBook purchased as a single order. Enter INSPECTAEHRB in the order payment page 'Promo/Redemption' space.
    Building inspection education & report writing systems from Carson, Dunlop & Associates Ltd
  • Commercial Building Inspection Courses - protocol ASTM Standard E 2018-08 for Property Condition Assessments
  • Home Inspection Education Courses including home study & live classes at eleven colleges & universities.
  • Home Inspection Education Home Study Courses - [email protected] Training 10-course program.
    Special Offer: Carson Dunlop Associates offers InspectAPedia readers in the U.S.A. a 5% discount on these courses: Enter INSPECTAHITP in the order payment page 'Promo/Redemption' space. editor Daniel Friedman is a contributing author.
  • The Horizon Software System manages business operations,scheduling, & inspection report writing using Carson Dunlop's knowledge base & color images. The Horizon system runs on always-available cloud-based software for office computers, laptops, tablets, iPad, Android, & other smartphones
Publisher - Daniel Friedman