This basic mechanical room thermostat is an economical and simple-to-use device for controlling room temperature. Simply turn the mechanical control dial to your desired temperature setting to regulate heating. An audible click sounds when the dial is turned past the current room temperature, indicating when the system switches ON or OFF. This 2-wire mechanical thermostat is easy to install and features volt-free contacts, making it compatible with combination boilers and standard boilers. For three-wire installations, safely isolate the neutral wire—the thermostat will operate reliably as a two-wire device. Designed for simple automatic ON/OFF control of heating systems, it senses ambient air temperature and activates heating when temperature falls below the set point, then deactivates once the set temperature is reached. Features: - Dual diaphragm temperature sensing element - Suitable for surface or back-box mounting - Temperature set point range: 10°C to 30°C - Current rating: 10 A (resistive load) - 2-wire installation - Power supply: 220 V AC, 50–60 Hz - Terminal differential: approx. 4°C - Operating temperature range: −25°C to +55°C - Dimensions: 83 mm (L) × 83 mm (H) × 31 mm (D) - Package includes: 1 × Thermostat