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I see is not so old post, but similar question to posted, I have is well vaillant Eco 831 and I'm looking for new thermostat, receiver with whole set, any recommendation? Water is heating when using which is good then only interesting for central heating

Hi all, How to find compatibility remote control to my receiver Sunvic programmable, I lost my old one and I need to invest in new, but I'm not sure if I need to lookonly for same brand as sunvic or could I go and brought other one? Can you help me with that please I attached photo of...