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Banging from boiler when hot water turned on.

My boiler bangs when i turn on hot water,and it goes hot and cold,can you help,thankyou.

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Install a knocker in the line and bleed the air out

Posted on Jan 14, 2009

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Baxi duotecHEa 40kw combi boiler made loud banging noises for 2 or 3 minutes then stopped. What might have been the problem


the banging is the water boiling/overheating Check the pump is working by undoing the large screw on the front of pump and gently putting a soft stick into the space behind to check that the rotor/impellor is turning. take care to catch the water which drips from the screw hole

Feb 02, 2016 | Water Heaters

1 Answer

Glow worm 45-60 standing boiler making banging noises when in operation


The noise you refer to is called Kettling, it is caused by the hot water in your boiler not being able to leave the boiler quick enough, if the problem developed quickly and your system is a "fully pumped " system this would generally point to your pump either has failed or is on its way out, i.e . your radiators would not heat up as the hot water is stuck in the boiler hence the banging......( if you know where the pump is you can generally feel if it is running by a small vibration ) if you have gravity hot water and pumped heating circuit then I would assume that it is noisy when just doing HW, and the banging is a problem that has gradually got worse it can indicate that the boiler is scaling up (are you in a hard water area). if this is correct there are various additives that can be put in the system to help quieten it down, I suggest you really need a heating engineer to diagnose fully.

Feb 07, 2014 | Water Heaters

1 Answer

Noisy water pipes when neighbours use water


Install air chamber to cushion sudden-stop of flowing water.
Water flow coming to sudden stop is called water hammer, and will bang pipes, but also loosen plumbing joints, causing leaks.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html#bang
http://waterheatertimer.org/images/Flow-rates-water-hammer-600.jpg

Air chamber has to be vertical, and about 18" long, with cap on top.
By code each Hot and Cold line at each tap will have air chamber located behind the wall. So there are two air chambers at each tap.

In your case, you can probably add air chamber to your Hot and Cold lines and solve problem for both dwellings.

Water hammer is caused because water does not compress like air.
So when long column of water suddenly stops... the whole pipe-full of water comes to sudden halt... and that water could weigh 1-1/2 pounds ... and just like a hammer head moving, the weight of water bangs the pipes to dissipate energy, causing noise.

Apr 21, 2013 | Water Heaters

1 Answer

When i run a hot water tap or put the heating on my boiler bangs and the flames flicker like in a draft, when it does this i can smell gas a little , its like a shuddering banging ,i have visions of it...


If you smell gas, call plumber IMMEDIATELY
IMMEDIATELY before house catches fire or blows up
http://waterheatertimer.org/

Install gas detector installed at correct height for type of gas.

Dec 23, 2012 | Water Heaters

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When i turn on the hot water tap the boiler starts to bang and rattle. doesnt do it with just the central heating on. please help


first check for loose pipes the you might want to add a damper on the pipe to absorb the hammering just t in a piece of pipe and make it go higher than the pipe with the noise and put a cap on topp of that

Mar 27, 2012 | Water Heaters

1 Answer

Its takeing a long time for some of radiators to get hot,and when they do they dont get that hot ,iv flushed the system out,could it be heating by-pass valve in the wrong position


hi there

start by turning off the rads that are geting hot,do the colder rads now get hot? try banging them gentle with a rubber mallet around the valves and across the rad.

If the rads are upstairs and the boiler below it may be the pump is showing signs of giving up.
is the circuit balanced correctley?

Dec 18, 2010 | Water Heaters

1 Answer

Boiler bangs when hot tap turned on


Hello,You need to install a domestic/high pressure extrol/expansion tank on your cold water pipe.Should slove noise.

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Alpha 240e boiler wont fire up for hot water, will for heating


most likely the diverter valve.. when hot tap turned on the movement of the water through the valve operates a diaphragm which pushes a pin/button//switch to tell the boiler to fire up

Aug 21, 2009 | Water Heaters

1 Answer

Vaillant ecoMAX 828/2boiler goes on & off when running hot water!


water must be set at 3lts a min ,check diaphragm valve move when hot tap is on, check microswitch ,best of luck

Aug 09, 2009 | Water Heaters

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