Raypak 266, 000 BTU Propane Millivolt Pool Heater 266,000 BTU propane millivolt pool and spa heater Mechanical thermostat can be set precisely to your liking , set it and forget it Cabinet and the internals are non-corrosive and rust resistant Features PolyTuf powder coating, polymer headers, and an all copper-fin-tube heat exchanger Also features a stainless steel tube sheet, 2 inch CPVC water connections, burner tray and fire tile