If you feel it is taking too long to heat your rads may be undersized.
There are various back of the fag box methods for calculating rad size and of course there are proper calculations that should be made regarding exterior walls, insulation, windows, doors, interiror walls etc.
You have to laugh at this guide from SEI www.sei.ie/uploadedfiles/InfoCentre/RadiatorsSizePosition.pdf Firstly they state poor installers oversize then they give back of the fag box calculations. It's worth a read. The important line is "This calculation produces a heat loss figure
in watts, of how much heat you need to warm that room up to the design temperature from -3 deg C in one hour" So in theory you should be able to walk into that room when the temp outside is -3 deg C and within one hour the room will read the desired temp at the thermostat. I think they assume your boiler temp is set high but not max. Most cals would be looking for 70 deg water temp.
There is a lot of glass ....rest of house is fine though. Its a "modern" house with double glazing etc through out.
Yeah - sounds like the extensive use of glass and maybe other issues with general insulation could be a key issue here. Certainly one to check out. Could you monitor things for a few evenings with heavy curtains pulled across such glass areas for example?
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