Okay, I admit up-front this is a tad feeble, but I'd rather ask the question than expend more effort and money (immediately at least). I recently replaced the siphon in my concealed bathroom toilet cistern after the diaphragm washer started to go. As well as fitting a Dudley Turbo 88 siphon (no...
Ever since my CH system was installed over a decade ago the pump has seemingly pulled air back in through the vent pipe once the water got hot, if set anything higher than the lowest speed. I have had a plumber out once to revise the pipework (pump repositioned vertically rather than horizontal)...