The Danfoss 103 Timeswitch Electro-Mechanical 24-Hour Clock is a reliable and efficient wall-mounted water heater timer designed for use with boilers. With a power source of batteries and a power consumption of less than 100W, this white-coloured device offers accurate timekeeping for your heating system. The Danfoss 103 Timeswitch is a trusted brand known for its high-quality heating solutions, making it an essential component for any home heating system. Comes with FREE CARBON MONOXIDE alarm.