Hi - I am interested in learning how to use our UFH system more efficiently. I have checked the key post on this topic and I note that a previous poster stated "The system works on the principle that the boiler is always on, thus keeping the underfloor pipes at a minimum temp. all day. Then in the evening or morning, the boiler kicks in at a higher temp and gives a blast of heat that quickly radiates through the room cos the floor is already warm, and doesnt have to be heated from scratch. Because of this, the room heats quicker than with radiators" In our case, we switch on our firebird boiler from about 4.30 every evening for the UFH. Therefore, we are trying to heat up floors that have gone cold. It takes quite a while (maybe 2 hours) for the rooms to reach a comfortable level of heat - even though our room thermostats are set to 24 / 25 degrees. Our oil bill is very high (€2200 for previous 12 month period). I am hesitant to have our boiler always on in case our fuel bill goes even higher and that our firebird boiler wouldn't sustain the pressure of being on all the time. Are we wasting too much oil in heating the floors from cold and would it be more efficient to have the boiler on all the time and set the room thermostats to a lower temp? Any advice would be appreciated.