Easy replacement of the CentaurPlus, ServicePlus and Thermoplus range - Uses a standard 6-pin backplate for easier retrofits of C17 and C27 - designed to supersede the CentaurPlus and ServicePlus range of time switches and programmers by using the same wall plate with minor wiring changes Combi or system boilers and heat pumps up to 2 zones - Central heating and hot water control Programmable via the Secure Controls bluetooth installer app or the wireless display without a Wi-Fi connection Smart control capability by Wi-Fi adaptor (Sold separately) 7 year no quibble warranty Significantly improves boiler efficiency with load compensation and optimum stop/start