BTU's and boiler question

[Markey]

Hi all,
My first time here and i have a few questions.

My lounge is 20ft x 12ft with an open chimney, double glazed window and double glazed french doors. I only have one rad 2200x600 single skin/convector ( i think thats right ). What would be the BTU output of this rad and what is needed for this room?

Does anyone have a way to workout the btu output of a rad based on its size? (mine are all single skin single convector)

My current boiler is labelled as a 40/55 NG boiler,which i guess should have been converted to LPG burners but if it hasnt could this explain using 2x47kg bottles of gas (about £72) every three weeks with about 6hrs day usage?

I have a large 3bed semi (see the lounge size) in the middle of nowhere on top of a hill(hence the LPG). Can anyone give a gut feeling for boiler size needed? currently the rads only get warm to the level where i can still lean against them just wearing a shirt. I can barely touch the rads in my parents house.

 

[cross thread]

boiler sounds undersized.rad needed for a lounge that size is about 2.5 kw.sounds like your ready for an updated boiler and system, new condensing boiler will drop gas usage

 

[cross thread]

boiler sounds undersized.rad needed for a lounge that size is about 2.5 kw.sounds like your ready for an updated boiler and system, new condensing boiler will drop gas usage

 

[Markey]

Many thanks for your comments gordongas definatly going to replace it

i guesstimated about 70,000 btu boiler but i am thinking about extending in the not too distant future so i wanted to get a bigger boiler than i needed say the baxi 100/2 HE, is it a problem this running at a lower level it says its fully modulated between 9-30kw.

 

[JohnD]

I like to have extra-big rads (with TRVs) so the boiler can run full tilt getting them all heated up, then have a rest. then, if you've been out all day, it has ample power to warm the house quickly, also in unusually cold weather.