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I am trying to improve my father's old central heating system by fitting a programmable thermostat. Before starting the project I did some research and found advice that it is a straightforward process to connect the stat across the 'boiler on' feed from the controller, set the heating to continuous and let the new stat run the system. Unfortunately doing this means the DHW only function is disabled, there is no immersion heater, so no heating in warm weather means no hot water. If I connect the stat across the pump feed, the boiler is on 24/7 which defeats the whole point of the excercise. Installing an immersion is not an option so I am now stumped. Does anyone out there have any suggestions? Is there a wiring solution that I haven't thought of yet? I'm wondering if a cylinder stat might control the boiler, and then the room stat can control the CH valve and pump. Any advice most welcone please.