The Deluxe Proheater is a much larger greenhouse heater for semi-commercial greenhouses. Heating and frost protection from 500sq.ft upto 1000sq.ft. The Gold is operated by an electrical thermostat (requires 230v 3 pin plug) and electrical solenoid valve which reduces the output to a small pilot flame. The electrical thermostat gives greater accuracy and consequently better control over fuel economy than the Silver model. This heater runs off propane. 630mm wide x 170mm deep x 535mm high. Regulator, gas hose and jubilee clips not included available in the accessories section below.