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@Mr_Smyth
i’ll be speccing 22mm pipes and bigger triple column rads on new (late 50’s) flat with future heat pumps in mind, even if we move on before they become available for the building.
Will be internally insulating and secondary glazing too but at least we get 10 years of lower bills and a decent EPC rating which people are bothering to look at now.
what is the risk of over specifying your rad sizing with a gas boiler?