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In an effort to control my extremely high gas consumption, I turned down the "flow setpoint" temperature on my Keston Heat 55 boiler from 70 degrees to 48 degrees. This has substantially reduced my gas usage. I have underfloor heating and this new temperature seems to be high enough for that...

I had been hearing a loud clicking noise from a motorised central heating valve, as per the following clip: I've now moved the lever on the valve to the position shown in the attached photo (the opposite of where it was) and the clicking has stopped. I can see that the lever's current position...