might be 8-10 years -my mate is council plumber-he services it every year - system has inhibitor in it and anything i let out is reasonably clean -temp guage not worked for over a year but hasn,t affected system before -
i have an 8 year old biasi which up till now has been fairly reliable but now getting various faults - boiler firing up on c/h then running until it overheats and cuts out sometimes not cutting out untill after very hot water is expelled - pump running but won,t fire up...