Haven't got a smart meter, but really worried how much it's costing to keep the heating on at the moment during these cold temperatures. Like really worried. Seen figures around saying £3 an hour of gas, we've had ours on most of the day as we've got young children. £30 a day? That can't be right can it? Plus electricity, that's over £1000 a month...?
It's a complicated equation. Depends entirely on the configuration of your central heating system and how you operate it.
A bigger house has more radiators so has a higher power boiler which uses more gas per hour than a smaller one.
You may chose to heat the whole house rather than just one room, which uses more gas.
Setting the thermostat to say 15 deg will cause the system to knock itself off sooner than setting it to 25 deg which would use more gas.
A well insulated house may not need the heating on permanently to maintain a sensible room temperature even in the current cold conditions, but a poorly insulated house may need to have the heating stay on to maintain a particular room temperature with a particular outside air temperature, which uses more gas.