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You should call the manufacturer. Pentair is 800-831-7133 and Hayward is 866-429-7665. Jandy, Zodiac, is 800-822-7933. There are typical sizes i could give you, but it's gonna be very upsetting if you need to rerun piping because of low pressure.

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Q: What size gas line do you need to run a 250 BTU above ground pool gas heater From the meter to the heater is 70'?
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What size gas heater should you buy for a 27' above ground pool in Upstate New York?

400,000 btu's minimum ...pat What Pat is not considering is the size of your gas meter or the gas line to the equipment pad if there is one. If you are starting from scratch you still need to know the gas meter size and the length and diameter of the gas run. Absolutely critical to heater installations. Because of the existing gas line and meter you may be limited as to the size or BTU of the heater. k


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