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Whilst I think of this! Can anyone recommend a good quality reliable CO detector, a battery one? I have an old spot card one but I'd like a good quality reliable one to fit near my boiler. Thanks for any help

Hello, a quick query I'd like to ask for help with if I may, please don't laugh as it is probably simple but I just cannot work it out :oops: = If a boiler's heat exchanger (normal boiler not combi) is blocked with sludge etc why would the flow get really hot and the return stay cool? I know...