This Choice basic mechanical room thermostat is an economical and simple to use room thermostat. Simply turn the mechanical control dial to your desired temperature to control your room temperature. This unit produces an audible click when the dial is turned past the current temperature, indicating when the system is turned ON or OFF. This mechanical 2-wire thermostat is easy to install and features volt-free contacts, making it suitable for systems with either a combination or standard boiler. For a 3-wire installation, disconnect and insulate the neutral wire; this 2-wire thermostat will provide reliable performance for years. Designed for simple automatic ON/OFF control of heating systems by sensing air temperature and activating the heating when the temperature drops below the set point, then switching off when the desired temperature is reached. Features: Dual diaphragm temperature sensing element Suitable for surface or pattress box mounting Set point range: 10°C to 30°C Current rating: 10 Amp 2-wire installation Power supply: 220V AC, 50-60Hz Temperature setting range: 10°C to 30°C Current rating: 10(3) Amp Terminal differential: Approx 4°C Operating temperature range: -25°C to 55°C Dimensions: L83 x H83 x D31mm Package Included: 1 PC Thermostat