this gives an estimated requirement of around 2,100 BTUs so you should be fine with this, provided that your ceilings are no higher than 8ft, which is what i allowed in the calculation. (bear in mind heat rises, so higher ceilings would simply allow all the warm air rise above a useful level).
as i said however the above formula is only a rule of thumb. factors such as double glazing, loft & cavity insulation etc also need to be taken into account. also worth checking to ensure your boiler has the necessary capacity.
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