This Honeywell programmable thermostat features wireless connectivity, a 5–35°C temperature range and a digital display, allowing you to control your heating controls with ease at home. The Honeywell T3R Programmable Wireless Thermostat is compatible with a wide range of boilers and systems including 24 V to 230 V on or off, such as gas and oil boilers, combi-boilers and heat pumps. The T3R offers OpenTherm control but is not suitable to control electric heating.