Time switch designed for heat-only setups. Volt-free and mounted on a 6-pin backplate. Offers 3 operating modes including 24hr, 5/2 day and 7-day, ideal for controlling a boiler in a central heating system. Features blue backlight display, lockable keypad, preset clock, frost protection, and holiday mode with auto winter / summer time. 5-35°C Temperature Range Suitable for All Boilers Mains-Powered Thermostat Mains-Powered with Battery Backup Programmer 7 Day, 5 Day & 24 Hour Programmable 3 Pre-Set Programmes 3 On / Off Periods per Day Boost Facility Frost Protection Holiday Mode 5-35°C Temperature Range Suitable for All Boilers Mains-Powered Thermostat Mains-Powered with Battery Backup Programmer 7 Day, 5 Day & 24 Hour Programmable 3 Pre-Set Programmes 3 On / Off Periods per Day Boost Facility Frost Protection Holiday Mode