Flooded Water Heater (C) Daniel Friedman Hoyt Water Heater Age Decoder
Hoyt water heater data tag indicates heater age

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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 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.

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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,

  1. A.O. Smith owns GSW
  2. which in turn owns American Water Heater Company (AWHC)
  3. which in turn owns Polaris.
  4. American Water Heater Group, 500 Princeton Rd., Johnson City TN 37601 Tel: 800-999-9591
  5. Website: www.americanwaterheater.com.

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