having replaced a ball cock in header tank on my old gravity fed system with imersion tank my hot water flow is slower and sometimes stops, seems to be a delay in the header to imersion tank, all i did was isolate and drain header and imersion as i also replaced a hot water tap, then turned water suply back on, header filled back up and everything seemed ok, but hot flow is slow and perodicaly stops and then returns, have i an air lock??, if so what can i do?, would appreciate any help, not a plumber as you have guessed!!!, cheers
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