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Cchrish0
Hi all. Wondering if any one can help out. We are having a new grant external blue combi fitted on a project we are working on. The total rad kW is about 12000. There is one main bathroom with poss combi fed shower. An on suite with Elec shower, downstairs toilet and kitchen. Engineer is planning on fitting a 21 kW model. My concern is this may be a little small. Any advice would be great.