The figure for around 700-1Kw is pretty much what I have found, depending on the weather. At high room temps or when not cooking,its lower.
But it is, you have a 10KW plus boiler constantly on and off, maintaining temperatures throughout MUCH of the year.
As I said, in summer the aga is switched off. In winter its supplemented. It is like 'baseband' heating then..its always there operating at high efficiency. The lower efficiency non condensing oil boiler is used for demand peaks. Or open fires,. but lets not muddy the waters..
Now, I know, because ny stats and thermometers tell me, that this particular house in winter, loses about 0.5C per hour when its around
19C inside and -2C outside.By timing my heating I can - say - reduce the average temperature and hence heatloss by a bit - but not by much. Sadly even if we went out to work, the time the house is coldest is around 6 a.m. which is when we are in it and need a bit of heat, in the bedrooms at least.
Its a very moot point as to whether the firing cycle of the boiler, or having it ruin flat out at 10KW plus, with a lot of heat going up its balanced flue which comes STRAIGHT from outside, is not infact hugely less efficient than the aga, which has a 10meter conventional flue, and draws its air under the floors where it gets a bit of warming first.
The more mass is in the house, and the more efficient the insulation, the less it matters whether you time or not. I have to say that it scarcely makes any difference here, in the ground floors with the huge mass of screed above the insulation.
I do find that the upper floors of lightweight timber construction show far bigger heatloss at night: To the point where we need to use heating there in the wee small hours, and late at night too.
HOWEVBER iun SUMNMER we need to run fans up stairs - the solar gains are such that its insuufferbay HOT especially where the computers are... Whereass downstairs its cool..the mass helps reduce heat GAIN in summer, and reduces any need to cool the place. So it actually works BETTER and uses LESS energy in summer. Don't underestimate the cooling effect of a large lump of cold aga, either.
Well essentially it can.
`The things are massively insulated. YOU put 4 lightbulbs inside a box surrounded with rockwool and vermiculite and see how hot it gets inside..Our aga runs at a case temperature of around 45-50C estimated, and at a room temp of around 20-23C its seems to be losing around 700W or so to the room.
Which is prefect for that room on its own in winter, or half the house in spring and autumn. We simply leave the doors open,.
Not at all.
An aga doesn't DO 10Kw, unless yoou leave the oven doors open, when it might for about ten minutes till it cools down and becomes unuseable as a cooker..;
Dunno. Try the oil one with a conventional flue. I'd say 75%.
Better than my oil boiler for sure.
I use two electrics and a microwave as auxiliaries, but in summer it tends to be a barbecue outside.
If the weather goes cold, we light the aga again..;-)
Only takes about 6 hours to come up to temperature.