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i read in an earlier answer that radiators shouldnt really be bled often, is that right??? would the pressure would be low in a sealed system if there is air in the system instead of water??

help, i had a worcester bosch 28i fitted 2 years ago and had problems with the pressure dropping ever since. at first there was a rad leak but no more obvious leaks. the last time i had to repressurise the system was 10 months ago, is this normal? all i get from the plumbers is more pumping up...