I have a problem with a new heated towel rail which is not heating up properly. It is connected to the hot water system (as was my previous radiator) and contains a dual function element at the inlet side which is not yet connected to the electrics. The inlet pipe has a thermostatic valve which is on full, the shield valve also seems to be fully open (it has a plastic cover which I turned as far as it would go in the + direction). The inlet pipe is very hot, but the towel rail is only just warm. Could it be a gravity related problem? the top of the towel rail is about 70 cms above the top of the water cylinder? Any ideas anyone? I tried bleeding it, but there is no air in the towel rail. Thanks.