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So I wonder if the timer is the wrong thing here? Yes it is set to twice. Not sure what you mean by turning the "lock screw", this is a digital timer. You can only program it to have hot water on at certain times - but surely that is meant for having a hot water cylinder. Why would you...

Girlfriends house has a puzzling (cr#p) heating installation! CH - 11 rads, no room stat. Only two of the rads have thermostatic valves (in two of the bedrooms). This seems to be a rubbish way to try and regulate the house temperature (well, you can't really). There is also underfloor...