Digital heating controller (AC 230 V) with time programme, need for weather-compensated zone control plus d.h.w. 100 % replacement by RVP350, which has the same dimensions and panel cut-out. A 
Key data to replacement product: room unit (QAW50 or QAW70) is required, all other sensors can be re-used. The 
Key data to replacement product: RVP350 has additional features including multi-functional relay, holiday programme and bus communication. 
Info: Do not use the existing base as terminals are different - the 
Key data to replacement product: unit must be rewired (see Data Sheet).