EPH Combi Pack 4 Wireless Open Therm Smart Kit CP4iBoiler Plus compliant Pre paired Opentherm Voice control with Alexa Ability to control up to 6 zones with additional thermostats Hot water control available with additional thermostat Cost effective 5 Year warranty User friendly WiFi enabled digital RF programmable room thermostat and receiver suitable for controlling one or multiple heating zones (with additional thermostats). This programmable thermostat gives you all functionality of the COMBIPACK