Four models comprise this new line of commercial-duty, gasoline-powered pressure washers. Honda engines, ranging from 5 to 13 horsepower, power the washers and have direct-drive pumps with five-year warranties. Cleaning power ranges from 2,400 to 3,600 psi. A 3-piston, axial pump features a swash-plate design with fewer moving parts than traditional pumps for smoother, quieter operation and longer life, according to Karcher.