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it's an easy job to do.requires new fibre washers as well.you might not require inhibitor if the boiler is at the high point of the system, you would only need to drain a small amount of water from the heating circuit. if you haven't added inhibitor to the system for a few years now should be...

hi normally when an analyser reading is taken some engineers will only take a reading at high output and not also at minimum, the foghorn noise is resonance from the burner when the min gas mixture is set too low .the premixed gas and air is flowing slower than the burn rate .definatly one for a...

please be advised again ,do not attempt any repair on your boiler, only a gas safe registered person can fix your boiler. it does sound very likley that it is your fan though.