Listing all the features of the Boxxer 421 from HydraMaster “is a bit daunting,” the company said. The Boxxer 421 has a fuel-efficient, 21 hp engine with a two-cylinder, overhead valve (OHV) design.

Generating up to 3.5 gallons per minute of cleaning power with fully adjustable 0 to 1,000 psi, the Boxxer 421 “can clean carpets and deep clean tile and grout.” The Heat Exchanger System heats water up to 250 degrees, improving the efficiency of carpet cleaning chemicals and expediting drying time, according to HydraMaster.