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Gas line size for pool heater
I have a 1.25" line coming off the gas meter. If we came off that line in the basement, the distance from meter to pool heater would be 123'. The manufacturer says it needs to be a 1.5" at that distance to adequately supply a 400K BTU heater. I've had a plumber say we have to run a new 1.5" line from the meter. Another is saying that we can just add the 1.5" onto the 1.25" for the distance of basement to equipment. Although that's a cheaper option, it doesn't sound right to me. Any thoughts?