Discuss Water hammer after combi boiler installed in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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Hi,


I'm new here and would greatly appreciate some advice. We recently had a combi boiler system put in our late 1960s semi - We used to have a gravity system with conventional boiler that was sited in the kitchen on the ground floor but the new combi boiler is now upstairs in the airing cupboard where the old immersion tank used to be and is adjacent to the bathroom. The new installation uses our old rads and a new rad with some new pipework.

We have quarter turn mixer taps on the kitchen sink downstairs and on the bath and bathroom wash hand basin upstairs. Since the installation, all taps - both hot and cold - clunk when we turn the taps off (and sometimes they clunk when they are turned on but to a much lesser extent, except for the hot tap on the kitchen sink which clunks more when turned off than when it is turned on). When the taps on the kitchen sink downstairs clunk shut it causes water hammer and reverberation in the toilet cistern upstairs. When the toilet is flushed and the cistern fills up it clunks shut and causes reverberation in the toilet cistern and water hammer. When any of the bathroom taps - both wash hand basin and bath, hot and cold - are turned off some water comes out of the instant shower situated over the bath and to a lesser extent some water comes out of the shower when the cold tap, but not the hot is turned off on the kitchen sink. We are guessing this is to do with the water pressure.

We called out the installers who told us that everything was down to water pressure and that we should turn down the main stop tap. They are refusing to do anything else even though that hasn't helped. We want to call another plumber out but are we right in thinking that this is going to be a process of trial and error? Where do we start? - With replacing the valve in the cistern with a Torbeck equalibrium valve or a Fluidmaster Quiet Float Valve (400UK074)? - We don't know as yet but we guess that current the valve in the cistern may not have had the restrictor inserted because the toilet was previously tank fed but is now mains fed. Would replacing the main stop tap help? - We read something about jumpers working loose in stop taps. And might a water hammer arrestor help and where should this be put? We don't know what our water pressure is, but could it be that we need to have a 'pressure reducing valve' put in near the main stop tap?

Many thanks for your advice.
 
you need a pressure reducing valve and an expansion vessel, call a proper plumber in :)
 
Your best bet is to put a shock arester valve in, like a little expansion vessel should stop all your water hammer
 
Sounds like the hot and cold are all piped in copper, adding a certain amount of plastic pipe will kill the water hammer. But in this case the small shock arrester wil do nicely.
 
Billee , where did you get plumbers from , telling you to turn mains down instead of fitting a pressure reducing valve, I would change main stopcock first , to a lever valve , if no good then fit a arrestor or P R V , maybe both ...
 
that's what i was thinking. it would probably do the same with a new one.
 
Many thanks for all the advice. Where would we need to site an arrestor? - bearing in mind that the water hammer is caused by using the kitchen hot and cold taps, all of the bathroom hot and cold taps and flushing the cistern in the bathroom..and use of the washing machine in the kitchen. Does this mean that an arrestor needs to be fitted to each of the supply pipes to each of these fittings? - as I notice that in the description of the arrestor it says that it needs to be installed close to the fitting.

Would it also be advisable to change the valve in the cistern to a Torbeck equalibrium valve or a Fluidmaster Quiet Float Valve (400UK074) as we're not sure, but we think that the valve that's in there might not have had the restrictor fitted in (as the cistern was previously tank fed, but is now mains pressure fed) - or would this just be a waste of time, do you think?




 
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