The Deluxe Proheater is a much larger greenhouse heater for semi-commercial greenhouses. Heating and frost protection from 500sq.ft upto 1000sq.ft. The Silver has a non electric thermostat which turns the heater down to just a small pilot flame when the desired temperature is acheived. 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.