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A heater with a 4.2kW maximum output, which switches itself off and on thermostatically. A regulator with hose is included as standard. The stainless steel burner provides adjustable heater output with a flame failure device, CO2 sensor and push button ignition. The casing is durable zinc coated steel. The height is 485mm (19"). The width is 360mm (14"). The depth is 130mm (5"). Ventilation is required when in use. At a typical site this heater will provide heat for a greenhouse up to 10'x13' or frost protection only for a greenhouse up to 10'x20'. 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.