Pilot light gas usage
Forgetting the cost of the gas used for a minute, you're assuming all that
energy is wasted. It's not - only a proportion is. The rest goes to
keeping the water inside the boiler warm so it doesn't have to heat up so
far when it fires next. More wastage when the system isn't in use though I
suppose.
Hadn't thought of it like that, but there's only so much water inside a
boiler. As soon as the pump starts and cold water is drawn in then
surely this preheating effect is minimal?
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