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size up where you can - a gas boiler will still benefit as you can lower the flow temps which makes your boiler work more efficiently
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That rad would go behind a sofa
As far as I understand the rad needs an air gap otherwise you won't get as much/any convection. Similar logic for putting new rads beneath windows; gives a large temperature gradient adjacent to the rad and thus more convection so the room is better heated.
I would put as much radiator into every room as you can fit/afford. If you have too much rad then you can run them cooler - possibly more energy efficient, and more comfortable if you're right next to the radiator. Conversely if you have too little rad then you'll run them hot, possibly be uncomfortable when right next to them, and still have cold spots in the room.
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gillies
Cupcakes
@hugo7
What's the deal with radiators?
We have one of these cheap ones in our dinning room that's quite big
I'd like something smaller, but not thicker.
It's in a Dining room/WFH room and you sit next to the rad when WFH. B&q BTU calculator says I need something with 4356BTU. Do you take these figure with a pinch of salt or what?
Similarly we need a rad for our sitting room which currently just has a gas fire and blankets. That rad would go behind a sofa and could only be 1m long, but fairly tubby.
All gas boiler central heating with no plan to change as we've just had a new boiler.
Cheers