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Has anyone done a costing over (say) 10 or 15 years to compare the cost of gas central heating/cooking vs off-peak electric heating/cooking. I automatically assumed that gas would be cheaper by far but what if you take into account installation and maintenance costs which can be high for a gas...

I have a gravity DHW/pumped CH system. On the DHW side I have a cylinder stat on the DHW storage cylinder which operates a motorised valve to control flow from the boiler to the storage cylinder. To speed up DHW heating times, could I simply replace the motorised valve with a small water pump...