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:wink: F & E Tank full , no by pass ,assume one of the bathroom rads is being used for this ?

Sorry all should have added this info too? 3 floors above ground have a ceiling height of 2.74m basment is 2.5m Making a head od around 10.22 m I guess ? F & E tank is in attic sitting on the joists. It has been some while since the top rads worked or got warm. but have worked in the past.

Hello, Newbie question :oops: We have a victorian house of 3 floors & basement.With 11 rads of varying sizes. The top floor rads dont get hot and we think it maybe the 15-50 grundfos not pushing the water well enough ? even with all the other rads turned off it still dont get up...