How to Find the Age of a Hot Water Heater, Calorifier, Geyser

In this serial number BM refers to Boiler Mate - an indirect fired water heater. Boiler Mate water heaters inculde a "top mount" heat exchanger. Amtrol BM water heaters were announced in 1986 so a BM- heater will be no older than 1986 (and usually newer). The company's records …

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