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AGE of WATER HEATERS
APPLIANCE DIAGNOSIS & REPAIR
AQUASTAT CONTROL Functions
BACKFLOW PREVENTER, HEATER WATER FEEDER
DRAIN a WATER HEATER TANK
ELECTRIC WATER HEATERS
FLOODED WATER HEATER REPAIR
GAS FIRED WATER HEATERS
HOT WATER EXPANSION TANKS
HOT WATER SUPPLY
HOT WATER IMPROVEMENTS
HOT WATER DELIVERY SPEED UP
INDIRECT FIRED WATER HEATERS
MANUALS & PARTS GUIDES - HVAC
MIXING / ANTI-SCALD VALVES
NO HEAT - NO HOT WATER: HEATER DIAGNOSIS
NOISE, WATER HEATER
RELIEF VALVE, WATER HEATER
SOLAR HOT WATER HEATERS
TANKLESS WATER HEATERS
THERMOSTATS, WATER HEATER
TIMERS for ELECTRIC WATER HEATERS
WATER HEATER ALTERNATIVES
WATER HEATER ANODES, DIP TUBES
WATER HEATER AIR INLET
WATER HEATER DEBRIS FLUSH
WATER HEATER DRAIN PROCEDURE
WATER HEATER EFFICIENCY
WATER HEATER FLUSH PROCEDURE
WATER HEATER NOISE DIAGNOSIS, CURE
WATER HEATER PROBLEM DIAGNOSIS
WATER HEATER COMPARISONS, PROPERTIES
WATER HEATER SCALE
WATER HEATER SAFETY
WATER HEATERS for HOME HEATING USE?
WATER ODORS, CAUSE CURE
WATER PIPES, Clogs Leaks Types
WATER PRESSURE TOO HIGH: DANGERS
WATER PRESSURE LOSS DIAGNOSIS & REPAIR
WATER SOFTENERS & CONDITIONERS
WINTERIZE A BUILDING
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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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
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,
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