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The Horstmann Electronic 7 Water Heater Immersion Heater Control G3 is a programmable thermostat designed for wall mounting. It features a rectangular thermostat shape, a grey plastic material, and a push button control style. This universal control is compatible with immersion heaters and offers features such as digital display, timer, and frost protection. With its corded electric power source and heat-off system switching, the Horstmann Electronic 7 is a versatile and efficient choice for controlling your home heating system.