GAS-FIRED, DIRECT VENT, CONDENSING, HOT WATER
2015-8-25 · is based on the D.O.E. (Department of Energy) test procedure. The Boilers are certified in accordance with ANSI (American National Standards Institute) Z21.13 standards as gas-fired, direct vent, condensing, hot water boilers. The Heating Capacity indicates the amount of heat available after subtracting the losses up the stack.
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