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I've just had a new Worcester Bosche 30si condensing boiler fitted and I'm interested in the most effcient way to run it. Currently its on timer for the heating coming on at 05.30 off at 07.30 and again on at 18.30 and off at 10.30 with the wireless thermostat in the lounge set at around 19deg.
Would it better to leave the boiler on all the time so its just topping up the temp in the rooms when it drops rather than warming up the rooms from cold?
I have mine set to 14 during the day when I'm not here, then 13 during the night. It is rare for it to come on in the night, but on cold days does come on in the day.
Never too chilly when I get home early, and, from what I have read, it is more efficient that way - though I woulnt keep it at 19 all day.
Mine is 19 in the early morning, 21 between 6 and 10 in the evening.
3 bed semi, heating bill is quite reasonable.
Research shows (will post if i can find )the more heat you put in a house the more heat you lose ,there will be a few exceptions like super insulated
House isn't the most insulated place at the moment but it will be. I guess i need to run the boiler on the timer for a week and then leave it on for a week and compare the meeter readings.
there was about a 50 page thread on this a while ago, debating merits of constantly on at (low temp) with top up at peak or [i]habitated[/i] hours vs, fully off then back on - thermal mass plays a big part in this - also see threads about stoves in single brick cottages...
As mentioned above, it depends on things such as the construction of the building, what insulation there is, airtightness, , type of windows/glass, ventilation, thermal mass etc.
As heat loss is proportional to temp delta between outside and in, the longer the house is warm, the more heat you will lose.