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All Thanks for your feedback. House is c 3000sq feet with high celings and high heat loss through the walls, 3 bathrooms, 5 bedrooms, and a need to have the house somewhat warmer than average. Boiler already installed so committed to it. 2 circuits, one for hw and the other for the rads +...

Can someone please help me? Our house is having a new central heating system installed, with a Viessmann 200W 35kw boiler and a separate unvented Viessmann 250 litre cylinder. The boiler has been installed with 22mm flow and return circuits (2 separate circuits). An outside heating...