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I've bought 4 new rads to replace existing ones. They are all singles and have inlet marked on lefthand side. The problem is that the existing pipework (microbore, plastered in-wall) has the inflow sometimes on the right and sometimes on the left. As the rads are singles I can't reverse them. It would be a real pain to replumb - floorboards up, replaster etc. What is the consequence of incorrect installation? Is it just an efficiency problem, e.g. it would take longer to warm up?