Why are the running costs of my UFH system high?

If you are finding that your running costs for your underfloor heating is beginning to rise, here are a few reason that could be casuing this:
-That the UFH system is correctly electrically connected to the boiler to prevent short cycling and to ensure that the boiler is not running when it is not required. 
-That the room temperatures and thermostat settings are not too high (typical comfort temperatures are 20OC in living rooms and 18OC in bedrooms). 
-For any open windows or draughts. It is not unknown for windows to be opened in cold weather, as the internal comfort remains constant with thermostatic controls. 
-That the boiler is running correctly. Has it been serviced and/or commissioned by an approved engineer. 
-That the floor downward losses are high due to inadequate level of floor insulation.