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I don't know much about single loop or microbore but I do know that smaller pipes are less efficient, so your bro in law is right about that, and because of that they'll be a problem if you switch to a heat pump in future. So if you're thinking about that or even want that option in future then redoing it would make sense.
Fox
Sumo
Central Heating question. Our house has a combi boiler with 2 fat pipes that go to a T junction then a manifold one for downstairs and one upstairs. That manifold has ins and outs for each radiator, pretty sure that makes it a single pipe loop system https://www.bestheating.com/info/the-ultimate-guide-to-heating-pipework/.
My bro in law is convinced we should update it to a flow and return system because it'll be more efficient. I think we should just chase all the pipes and insulate them with lagging. We're changing the radiators to some bigger ones and will update the boiler at some point in the future too. Has anyone got any input on whether this single pipe loop system will be a problem?