WIRED PROGRAMMABLE THERMOSTAT FOR DIRECT INSTALLATION - Designed for systems where the thermostat is wired directly to the boiler. Unlike the RT520RF wireless kit, this model does not include a receiver and requires wired installation OPENTHERM, VOLT-FREE & 230V BOILER COMPATIBILITY - Supports OpenTherm modulation as well as standard volt-free and 230V switching, making it suitable for both modern and traditional heating systems BOILER PLUS COMPLIANT (ErP CLASS V CONTROL) - Meets UK Boiler Plus requirements when correctly installed, helping optimise system efficiency and support lower energy usage COMPLETE WIRELESS THERMOSTAT & RECEIVER KIT - Supplied with thermostat and receiver, providing a full wireless heating control solution with no wiring required between units FLEXIBLE 5/2 OR 7 DAY HEATING SCHEDULING - Set daily or weekly heating programmes to match your routine, helping balance comfort and energy use