The wireless LCD digital rooms thermostat are designed to be used with electric, gas or oil heating system. Room thermostats are an effective way of controlling the temperature of the room/house, which in turn will save on your fuel bill. With the receiver being wired to programmer/boiler the thermostat can be in any room or area up to 20M away without the need for wiring back to the receiver. Digital display and simple to operate push button up / down temperature adjustment, constantly showing actual room temperature and set temperature when activated or adjusted, very easy to understand with "no set up" This thermostat is battery operated and the receiver has 24-240 volt free contacts for use with ANY condensing or combi boiler.