noisy pipes

[Ken shaw]

whenever my glowworm central heating boiler fires up there is a tremendously loud knocking noise in the pipes. Any clues ?Thank you

[cm]

: whenever my glowworm central heating boiler fires up there is a tremendously loud knocking noise in the pipes. Any clues ?: Thank you YOU HAVE WHAT IS CALLED WATERHAMMER. THERE IS ONLY ONE WAY TO SOLVE THIS PROBLEM. ON A PIPE CLOSE TO THE BOILER YOU NEED TO INSTALL A AIR CHAMBER. THIS IS A 18 LONG PIECE OF PIPE THAT WILL POINT STRAIGHT UP AS CLOSE TO THE BOILER AS POSSIBLE. THE BOILER DEMANDS ALOT OF WATER WHICH CAUSES THE WATER TO PULL CAUSING AIR POCKETS. THIS AIR CHAMBER WILL SOAK UP THE AIR ELIMINATING THE HAMMER.

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