This rotary knob digital room thermostat provides reliable temperature control for a range of heating systems. Compatible with multiple heating systems: Designed to work with electric heating, hot water heating, and gas boilers to help maintain a comfortable indoor climate. Dual sensor options: Builtin aluminum sensor and an external sensor up to 3 meters (300 cm) long for flexible placement and accurate readings. Precise control: Set temperature from 5 to 40 C in 5 C steps, with a calibration feature to match the actual room temperature. Clear LED indicator: An integrated LED shows red when the heater is active for quick ataglance status. Rotary knob operation: Simple manual control with a rotary knob for easy adjustment. Use scenarios Living room with electric heating: Use the thermostat to maintain a comfortable setpoint while keeping energy use efficient. Home with gas boiler central heating: Place the external sensor in a central living area to reduce boiler cycling and improve room comfort. Rooms with placement considerations: Use the external sensor in a location away from direct heat sources to ensure readings reflect actual room temperature.