Interesting. My Potterton Kingfisher 2 RS 80 boiler was installed 23 years ago. The plumber told me this type is very simple with not much to go wrong, but three years ago he advised me to buy a replacement pump as this would be the most likely source of failure and spares were getting hard to find. This I did but he is no longer available to consult, although there is no trouble at present, so could you say if you had to drain your system before changing your own pump?
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