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A heater with a 1.5kW maximum output, which switches itself off and on thermostatically. The heater output is adjustable with flame failure device and CO2 sensor. The casing is durable zinc coated steel with a powder coated finish. The height is 450mm (18"). The width is 310mm (12"). The depth is 130mm (5"). Ventilation required when in use. At a typical site this heater will provide heat for a greenhouse up to 6'x8' or frost protection only for a greenhouse up to 8'x10'. 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.