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Sorry I meant to say flow and return. the flow = hot for me, return = cold. some radiators have 1 hand valve on each side, so I guess it doesn't matter, but some others have the hand valve on only one side, so is there a problem from where the flow come in ? The system is a basic combi/boiler...

I need to do a central heating pipe network under the house, just wondering if it matters the hot going to the radiator pipe with the valve or to the radiators normal pipe ? Please explain why ? System is a normal condensing boiler with expansion vessel. thank you