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 you turn the dial 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 three-wire installation, cut back and make safe the neutral wire; this two-wire thermostat will provide reliable performance for years. Designed to deliver simple automatic ON/OFF control for heating systems by sensing air temperature and activating the heating when the temperature drops below the set point, then switching off once 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 Amps - 2-wire installation - Power supply: 220V AC, 50–60Hz - Temperature setting range: 10°C to 30°C - Current rating: 10(3) Amps - Terminal differential: Approx. 4°C - Operating temperature range: -25°C to 55°C - Dimensions: 83mm (L) x 83mm (H) x 31mm (D) Package Includes: 1 x Thermostat