NorthStar Pressure Washer Heater/Steamer Add-on Unit - 4000 PSI, 4 GPM, 120 Volt Upgrades a cold water pressure washer into a hot water/steam pressure washer For pressure washers from 2-4 GPM and 4000 PSI max. Diesel burner heats water up to 250deg F Diesel burner has 1/2in. Schedule 80 heating coil, temperature control and 4-gallon fuel tank 5-ft. quick-couple hose connects to pressure washer pump