Digital heating controller (AC 230 V), with time programme, used for weather-compensated control of two zones, plus burner and d.h.w. control. Replacement is the RVP361, which has the same dimensions and panel cut-out. Room Units must be replaced (by QAA50.110/101 or QAW70), all other sensors can be re-used. 
Info: Do not use the existing base as terminals are different - the 
Key data to replacement product: unit must be rewired (see Data Sheet).