The T3R enables automatic time and temperature control of heating systems in homes and apartments. The T3R saves energy - the advanced Honeywell Home TPI self-learning algorithm ensures that boiler control becomes more efficient than ever. The cost of the T3R offers the best value for money. These thermostats are easy to use and feature precise temperature control that makes the operation of boilers more efficient. They are characterized by a contemporary design, clear, backlit temperature displays that are visible from a distance, and large temperature buttons that are easy to operate. All of this, along with a straightforward programming philosophy, makes installation simple and extremely user-friendly. The T3R is completely wireless and consists of a radio thermostat and a radio receiver box. The radio thermostat can be placed anywhere in your home, while the radio receiver box can be directly wired to your boiler - without any cables between the thermostat and your boiler. (2x AA batteries for powering the thermostat are included). This thermostat is compatible with 24 - 230 V on/off devices such as gas boilers, combination boilers, and heat pumps. It also works with zone valve applications. Not suitable for electric heating.