As a rough guide most apartments and smaller houses, with up to
10 radiators will require a 24-25kw boiler. A 28-30kw would be installed for a medium to large 3-4 bed house with up to
15 radiators, and a 33-35kw and a 40kw would be for a large house with anything up to
20 radiators.Jun 26, 2013
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