The Vaillant VRT 350F programmable room thermostat is available for wired or wireless installation. This thermostat modulates the boiler for maximum efficiency and comfort, including quick mode selection, automatic daylight saving and holiday functions, as well as fault and service indicators for added convenience. It features a blue backlit display, 2 push buttons and 1 rotary knob, holiday set-back function and calendar function, and automatic summer/winter change over. It also has advanced override settings, 3 independent time settings. The Vaillant Programmable Wireless Room Thermostat has intelligent room compensating controls that allow you to fine tune your heating system, giving you even more control. You can turn your system on or off at different times of the day, and it continually monitors and adapts to give you the desired room temperature. Features & Benefits: Intelligent time and temperature control of heating and domestic hot water. Attractive, easy to read and easy-to-use design with blue backlit display. Adjusts heating and hot water to British summer/winter time. Two push buttons and one rotary knob are needed to select and change data. Five operation modes: automatic, summer, comfort, set-back & system off. Two temperature setting levels: desired and set-back temperature. Cylinder boost option. Wireless control.