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The basic function of a power washer thermostat is to regulate the operating temperature in the engine. With a thermostat, you can prevent your engine from cooling and heating excessively. The thermostat also allows users to control the amount of coolant in the engine. Some of the components in a pressure washer thermostat include a rod, valve, cylinder, and wax. Among the most efficient electrical components for the Magnum 4000, GP Panel adjustable thermostat tops the list. At Hot Power Washers, our GP Panel Mount Probe Adjustable Thermostat allows you to regulate the engine temperatures from 86 to 250 degrees. You can get this adjustable thermostat for as low as 57.95.