Hotsy's HWE series hot-water pressure washers run entirely on electricity. Water heats in a stainless steel coil, which lies in a tank of water solution for instant hot water when the washer is plugged in. With no noise or fumes, the company claims HWE pressure washers are ideal for industrial cleaning indoors. The machines are compact, feature auto start, and are backed by the company's 7-year warranty. Power ranges from 2,000 to 3,000 psi, and volume ranges from 3.46 to 3.9 gpm.