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Hello all, Having recently moved house, we've just changed our old unreliable boiler and vented hot water tank system for a Viessman 100 combi boiler. We have radiators upstairs and a few downstairs - all now getting much better heat through them. We also have two wet underfloor 'zones'...

Hello all, Having recently moved house, we've just changed our old unreliable boiler and vented hot water tank system for a Viessman 100 combi. We have radiators upstairs and a few downstairs - all now getting much better heat through them. We also have two wet underfloor 'zones' downstairs...