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I'm have 4 x 400mm wide radiators installed in a semi circle bay window. My builder has started to pipe them up in series with the outlet of the first radiator feeding straight into the inlet of the second and so on. I'm pretty sure that it won't work as the temperture drop across each rad (i'm presuming about 20 degrees) will leave the 3rd and 4th rad barely warm. Can anyone confirm if this is correct? I'm pretty sure each rad needs its own feed directly off the main. I don't want to have to wait for it to fail before getting him to re pipe it.