Vapor-Flo 7990Freight not included. As one of the most powerful pressure washers in the Vapor Flo series, the Vapor Flo 7990 features high pressure levels of 2175 psi (150 bar) and a high flow rate of 10. 2 LPM, ideal for the most difficult industrial applications. For added versatility, this model can function as either a hot water or cold water pressure washer. Temperatures reach 79. 4C in only 20 seconds using heavy duty, stainless steel heater exchange coils.