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Hi, Another question if I may! Can anyone point me to a reasonably technical theory on how combination boilers work? Regards FarmerJo

Hi, I have a Potterton Puma 80 combi and wondered if there was a manual or URL link containing instructions on how to program its internal timer. Failing this, if anyone has this timer and knows how to use it, it would be appreciated if some instructions could be posted. Many thanks...