Among the most powerful models available, virtually every 4000 PSI pressure washer is a rugged, gas-fueled unit with a direct drive axial pump and used primarily for commercial applications. The average homeowner will get everything they need out of a less powerful 1500 to 3000 PSI pressure washer. 4000 PSI units commonly feature a high rate of water flow, a powerful engine and industrial-grade components designed to take a lot of wear and tear.
With the entire system mounted on an all-steel frame and moved by large, durable pneumatic tires, 4000 PSI pressure washers are often built with a 390cc Honda engine or something comparable. The direct drive pump usually features a sight glass for oil, an adjustable pressure unloader and a drain plug. Thermal overload relief valves help to eliminate overheating, while rubber feet reduce vibration during use.
4000 PSI pressure washers commonly come with up to 5 pro nozzles with quick-connect couplers, a 50 foot wire-braided hose and a chemical injector. Hose reels may be installed for organizational purposes. Other features of gas-fueled washers are low oil shut-down mechanism, adjustable pressure valve and easy-start function. Numerous brands including Cam Spray, Mi TM Corp, Campbell Hausfeld and Northstar offer 4000 PSI models at prices ranging from $900 to $6,000 and more for incredibly powerful hot water pressure washers.