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Am putting in solar and battery system. I know I can heat my hot water with an immersion heater, but can I also fit an immersion heater into the closed central heating system that is currently heated by my oil-fired boiler? I can't find anything online about immersions in the wet central...

Have brick-built barn, which has been previously converted by putting timber studding about 30cm from inner brick wall and covering with Kingspan. 2 of the rooms are at angles to the rest of the building and are much colder, both single story with vaulted ceilings. Both have huge draughts...