I have a 3 bedroom semi detached house, large rooms downstairs. Downstairs is underfloor water heating, going in 4 rooms, in the hall way 1x large 4 column radiator, upstairs towel radiator in bathroom, 3 bedrooms have 2 column radiators in. I have a baxi 105 he combo boiler, this has an expansion valve on it. My rads upstairs seem to take an age to
Heat up, and then I'm not sure if they are big enough to give out the correct heat. Also water pressure is rubbish. Will changing the boiler to a bigger flow rate and higher heat output solve most of these issues?