Analogue heating controller with time switch. Direct replacement by RVP201.1, same dimensionsandpanel cut-out. Room unit QAA35.3 must be replaced by QAA50.110/101 (analogue) and QAA80 by QAW70 (digital). All other existing 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).