Single boiler pack designed for installation with a flow boiler, for a heat-only system installation. 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 central heating program. 5-35°C Temperature Range Suitable for All Boilers Mains-Powered with Battery Backup 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 5-35°C Temperature Range Suitable for All Boilers Mains-Powered with Battery Backup 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