Response to This heater does have a water pressure switch and has a thermostat, so it does sense both water flow and temperature. Since your house is at 5,600 you would need a Raypak High Elevation Heater. The 206,000 BTU Raypak heater has a minimum flow rating of 20 Gallons Per Minute (GPM) and a max flow rating of 120 GPM's. Based on these flow ratings any pump from 1/2 HP to 2 HP would work fine with this heater.

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