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Seems odd that the boiler is constantly running. There are two demands, one is the room stat, the other is the stat in the boiler which measures the heat of the water circulating in the system.
Our place leaks heat massively (Victorian town house); if it's below zero outside, the max inside temp we can achieve is about 17 degrees. So the demand for heat from the room stat is constant (although it's set at 18 degrees, 21 is a sauna!)
However the boiler isn't working constantly as it can maintain 70 degrees water temp without having to be on all the time. I guess if we had more radiators, the house would be a bit warmer and the boiler would be working harder.
Moved into a new place (3 bed bungalow) a couple of weeks ago and we seem to be using about 10m3 / 100 kwh of gas every day (meaning about £4+/day just on gas).
Central heating isn't on all day but the boiler is burning constantly when the central heating is on. Thermostat is 21 degrees or so. Boiler is new but all the other gubbins is old.
Seems crazily high to me, considering it's not even that cold outside - or is that normal for a house and I've just been spoilt til now living in flats?