GAS-FIRED, DIRECT VENT, CONDENSING, HOT WATER
2020-7-30 · Boilers are certifi ed in accordance with ANSI (American National Standards Institute) Z21.13 standards as gas-fi red, direct vent, condensing, hot water boilers. Heating Capacity indicates amount of heat available after subtracting losses up the stack. Most of this heat is available to heat water.
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