Boxxer 421 has a laundry list of features

The Boxxer 421 from HydraMaster has a fuel-efficient, 21-hp engine with a dependable 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 Advanced Heat Exchanger System heats water up to 250 degrees, improving the efficiency of carpet cleaning chemicals and expediting drying time.