For a 75m2 apartment (2 bed property) running your heating for an hour will cost up to 18.85pence.
If you were to have your heating on for 6 hours a day during the heating season (October-March inclusive) this would potentially cost around £210
The technical bit - how did we work the above costs out?
Assuming we have a modern building with low heat losses, a reasonable assumption for the winter heating requirement is 30 watts per meter squared of floor area.
For a 75m2 apartment this results in a peak heating requirement of:
30 watts x 75m2 = 2,250 watts OR 2.25 kWh’s (2.25 units of heat).
Based on a unit cost is 0.0838p/kWh, we calculate the cost of running your heating for one hour works as follows:
2.25kWh’s x 0.0838p = 18.85p per hour