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I just put in a new pool with a Laars LT 400,000 BTU natural gas heater. The pipe from the gas meter to the heater is 1 1/2" and is reduced to 3/4" at the meter and at the heater. The length of the 3/4" pipe is about 4" at the meter end and about 18" at the heater end. When I turn the heater...