• Replaces Honeywell DT92E: For DT92, DT92E and DT92E1000 wireless room thermostats. Use the relay box in the kit, or bind the thermostat to the BDR91 relay box you already have
• Check your system first: Works with a BDR91 or the supplied relay box. Not for a DT92E paired to an ST9420C or ST9120C programmer, evohome systems or wired thermostats
• Made and supported by Resideo: TotalHome is a Resideo brand. Resideo is the company behind Honeywell Home and was Honeywell's home heating business until 2018. The TTHWFD relay box is marked From Resideo
• Easy to fit: Keep your existing BDR91 and bind the new thermostat to it with no new wiring, or fit the new relay box with mains N L L and volt free A B C terminals
• ECO button and intelligent heating control: Set the temperature with the up and down buttons, press the green ECO button to save energy and the power button for off
• Relay rated 24 to 230V 5(3)A: Volt free changeover contacts switch standard and combi boilers with simple on off control. Boiler Plus compliant with a time control

Pro Wireless Digital Room Thermostat - A digital heating and cooling thermostat equipped with an energy-efficient, self-learning algorithm and a one-touch energy-saving ECO button. Easy to use with no learning curve needed, the Pro Wireless Room Thermostat is a universal thermostat suitable for almost all heating applications. The thermostat, thanks to radiofrequency communication, can be placed anywhere in the house. It sends on / off indications to the receiver, placed near the boiler and connected to it with cables.