Twin boiler pack designed to accompany a flow boiler, to achieve a heating and hot water (s-plan) 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 2 zones in a central heating system. Each zone can be independently operated, with up to 3 daily heating programs which can be viewed on the LCD screen of the programmer. 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 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