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A powerful fan with a 1.8kW maximum output which switches itself off and on thermostatically. The 2 in 1 heating or cooling mode circulates heat in winter and cool air in summer. Features include 3 power settings with a thermostat and safety cut-off. This heater can be floor mounted with a handle and feet supplied or roof mounted with chains supplied for hanging from the roof apex. The diameter is 220mm (9"). The length is 250mm (10"). A stainless steel housing is supplied. A standard domestic 13 amp electricity supply is required. This heater provides heating for a greenhouse up to 8'x8' or frost protection for a greenhouse up to 8'x11' in normal site conditions. Heating requirements vary greatly with less heat required in a sheltered location or a lean to and more heat required in Scotland than in Southern England.