14 radiators, two linked to hot water circuit, modern Valiant condensing boiler, smart/adaptive temperature controls, silly amounts of loft and wall insulation, double glazed…..£65 per month and we are well in credit.we do benefit from the sun shining directly into the main living areas which heats the place pretty well, even in winter.
The boiler is the biggest saving (changed it when we moved in), the smart/adaptive temperature controls definitely help,as does having the system split in two; the bedrooms circuit is kept much cooler than the rest of the house.
Another big saving is being able to check what the room thermostat has been set to when I’m out by ‘someone’, nice feeling being able to turn it down remotely