nod Posted September 2, 2023 Share Posted September 2, 2023 I’ve started the plumbing running a flow and return in 22 mil copper from the manifold into the ceiling The 28 mil to the boiler room The ASHP guy has been down and said it needs to be 28 mil to the manifold and to the upstairs radiators Which seems like overkill to me Any thoughts ? Link to comment Share on other sites More sharing options...
JohnMo Posted September 2, 2023 Share Posted September 2, 2023 All depends on the flow rate though the system, length and bends. Is your manifold with mixer and pump or direct from heat pump? Link to comment Share on other sites More sharing options...
nod Posted September 3, 2023 Author Share Posted September 3, 2023 9 hours ago, JohnMo said: All depends on the flow rate though the system, length and bends. Is your manifold with mixer and pump or direct from heat pump? I’ve added a mixer pump to the manifold Link to comment Share on other sites More sharing options...
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