The lack of electronics leads to a very high efficiency of the device.
TOWER FROST PROTECTION THERMOSTAT STAT STTRFSN 10A Volt Free Replaces Honeywell
TEAMS FROST PROTECTION THERMOSTAT STAT STTRFSN 10A Volt Free
TOWER Frost Protection Thermostat Combi Boiler Heating Control Heat STTRFSN STAT
Frost Protection Thermostat Combi Boiler Heating Control Heat For Zone Valves
Frost Protection Thermostat Combi Boiler Heating Control Heat For Zone Valves UK
Tower Frost Protection Thermostat Combi Boiler Heat STTRFSN Brand New
