Tag: Honeywell T4 Thermostat

Honeywell T4 Programmable Thermostat  Introduction The T4, T4M and T4R thermostats are designed to provide automatic time and temperature control of heating systems in homes and apartments. The T4 It’s compatible with 24-230V on/off appliances such as gas boilers, combi-boilers and heat pump. Also works with zone valve applications but not with electric heating (240V).…