Response to Hi, I'm showing if you have a Two Stage Regulation System then you can use 1/2" gas line up to 150' from the outlet of the first regulator to the inlet of the 2nd regulator and then 3/4" gas line from the second regulator to the heater, not to exceed 10'. If you have a single stage regulator and you have 50' of 3/4" gas line then, unfortunately, you would need to go to a smaller 150,000 BTU heater like the Hayward 150,000 Universal Heater.
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