Designed to provide automatic time and temperature control of heating systems in homes and apartments. Compatible with 24-230V on/off appliances such as gas boilers, combi-boilers and heat pumps. Suitable for zone valve applications but not with electric heating (240V). 5-35°C Temperature Range Suitable for All Boilers 2 or 3-Wire Installation Mains or Battery-Powered Backlit Digital Display 5/2 Day or 24 Hour Programmable 2 Pre-Set Programmes 5/2 On / Off Periods per Day Boost Facility 5-35°C Temperature Range Suitable for All Boilers 2 or 3-Wire Installation Mains or Battery-Powered Backlit Digital Display 5/2 Day or 24 Hour Programmable 2 Pre-Set Programmes 5/2 On / Off Periods per Day Boost Facility