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Life expectancy of a Hoyt water heater:
This article describes how to read the data tag and de-code its numbers to determine the age of a Hoyt water heater. We explain the current and past owneship of Hoyt water heaters and give company contact information. We show typical water heater data tag model and serial number formats and note where in that information the year or week or month and year are encoded in the Hoyt water heater serial number.
How to De-Code the Data Tag on a Hoyt Water Heater - Age Determination
Hi Test Hoyt Water Heater Age De-Coding Tips
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
Most likely the year is following that "A" and denotes 1987.
The Hoyt Water Heater company "... have been engaged in the business of manufacturing, selling, repairing and servicing water heaters in Los Angeles since 1911 under the trade name of Hoyt Heater Company and Hoyt Automatic Water Heater Company." - Hoyt Heater Co. v. Hoyt
68 Cal. App. 2d 523
Hoyt was subsequently purchased by American Water Heaters or the American Water Heater Group.
From Carson Dunlop Associates Technical Reference Guide, the most complete HVAC and water heater age decoding guide available, the first two digits of the serial give the year and the second the week of manufacture.
Adding to what my mom calls "a lot of 'who struck john'" confusion,
A.O. Smith owns GSW
which in turn owns American Water Heater Company (AWHC)
which in turn owns Polaris.
American Water Heater Group, 500 Princeton Rd., Johnson City TN 37601 Tel: 800-999-9591
Reader Query: (Nov 11, 2015) chris said:
i am trying to find the age of my hot water heater. it is a hoyt and has the serial number:544872.
Reply: I'm guessing from several reader serial numbers provided that in the 1980's Hoyt Hi-Test water heater age was encoded in positions 4&5 of the serial number: in your case 1987
Reader query: 2016/06/05 David Stackhouse said:
Trying to find out age and value of Hoyt automatic water heater; size 3 serial number 16372 patent July 15th 1919. Feel free to contact me at email@example.com for pictures if necessary
This heater has a short serial number - send me a photo of its labels and I'll try to research it further; If I had to guess from just what's given it'd be 1972.
Reader Comments about Hoyt Water Heaters
Question: life expectancy of a Hoyt Hi-Test water heater
(Mar 5, 2014) SA said:
Regarding life expectancy: I purchased a 50-gallon Hoyt Hi-Test water heater on 28 Aug 1986 from Orchard Supply Hardware for $169.88. Serial #1148036. I replaced this unit today, having received nearly 28 years of excellent service from it. A few days ago, it began leaking. The reason for the longevity of service is probably because it has been used with soft water. Coincidentally, my plumber chose a new unit manufactured by American Water Heater Company, the same company that bought Hoyt. 4 Mar 2014
Thanks SA for this posting, having real reports of heater life are very helpful to everyone. I agree that water chemistry is a significant factor in heater life. Tell us - did you ever in 28 years drain and flush the water heater as manufacturers recommend or were you able to get away with skipping that task (as does almost everyone)?
Troubling is that it's not easy to find a "1986" in your water heater's serial number. I suspect it was made on day 114 of 1980 and had been in stock even when you purchased it, but that's just a guess. We see from various reader comments and questions that Hoyt Hi-Test water heater age encoding in serial numbers is a bit variable.
(Mar 9, 2014) SA said:
You're welcome, Dan. Count me in with "almost everyone," it was not even on my radar. The Hoyt water heater was never once drained and flushed during its 28-year life. But, most likely due to our water softener system, when the Hoyt was drained for the first time a few days ago, no sediment came out of the hose. I will be paying closer attention to our new water heater. But somehow, I don't expect to get the same kind of longevity from the new unit.
I agree that too often newer equipment, even by the same manufacturer, may have a shorter life; thinner steel, push to reduce production costs &c;
If you have not tossed out the old heater it would be instructive to pull the sacrificial anode to take a look at its condition; photos of the heater and its data tag and of the anode would be valuable to our readers if they're within your scope and not too much work. The CONTACT link on our pages works for sending pix if you like.
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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 firstname.lastname@example.org
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.
G.E. Water Heater warranties and other water heater information can be found online at geappliances.com
Lochnivar or some vendors of Lochnivar water heaters provide an online copy of its water heater warranty (01/26/2009)
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