What size exhaust pipe do I need of 7500 in 5900 BTU out gas furnace? [Archive]

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denysepoulsen

Sep 19, 2012, 12:04 PM

What size exhaust pipe do I need for a 7500 in/5900 out BTU gas furnace plus a 40 BTU hot water heater, in a 2000 square foot house?

ma0641

Sep 20, 2012, 04:57 AM

Think your numbers are off. Never saw a heater or hot water heater with BTU ratings that small. However, the heater manuals should tell you what you need.