ProCom MNSD2TPA Dual NATURAL/PROPANE GAS Vent-Free Heater, 10,000 BTU Not To Be Used in Recreational Vehicle, Ignition:- Electric Piezo Pressure Regulator Setting:- 6" W.C , 10,000 BTU Inlet Gas Pressure* (inches of water):- Maximum 9" Minimum 7" Pressure Regulator Setting:- 10" W.C BLOWER and BASE NOT INCLUDED.& NOT TO BE USED IN Recreational Vehicle