Hi all, renovating an old house and putting an extension on at the same time, so was wondering what size combi boiler I would need (going to purchase myself as have a mate that works for Bosch so can get it cheap) when finished house will consist of a mix of underfloor heating and radiators, downstairs will consist of four separate underfloor heating areas and the rest of the house will consist of about 8 - 10 radiators. There is also going to be a family bathroom, an ensuite shower room and also a seperate toilet with wash hand basin.
The majority of combi boiler will cope with 8 radiators, the consideration has to be given to the hot water flow rate. Get a boiler with a better flow rate and it should meet your needs.
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