Baxi Condensing Boiler Issue

jgc115

Hi All,

Ever since I got a Baxi compact condensing boiler installed recently upstairs I seem to have air in the water mains systems - i.e when I turn on the cold water tap downstairs (fed directly from mains) I get a lot of vibrations in the cold water pipe going upstairs to my water tank and Baxi boiler. The symptoms are like as if there is air in the system.

Would anyone have any idea how I could prevent this??

Thanks

jgc115

corkgsxr

Sound like water hammer.

Replace your water tank ballcock as they can often cause it as they get old

You can add a tee before the ballcock with a blanked pipe pointing up. The trapped air pocket provides a cushion and can reduce it. (Cheaper than a pressure vessel)

jgc115

corkgsxr wrote: »

Sound like water hammer.

Replace your water tank ballcock as they can often cause it as they get old

You can add a tee before the ballcock with a blanked pipe pointing up. The trapped air pocket provides a cushion and can reduce it. (Cheaper than a pressure vessel)

Thanks for the info - but would you believe it I had the ballcock replaced recently for another problem (overflow was leaking all the time) but that didnt make any difference to the banging and vibrations of the cold feed pipe. One thing I did notice is if I turn on the cold tap (downstairs) slowly and carefully it doesn't happen - strange!

spireland32

Try an equilibrium ballcock in your domestic tank or a water disc... equilibrium would be better

jgc115

spireland32 wrote: »

Try an equilibrium ballcock in your domestic tank or a water disc... equilibrium would be better

Many thanks!
I will look in to this and would you recommend any particular make of equilibrium ballcock?

sullzz

jgc115 wrote: »

Many thanks!
I will look in to this and would you recommend any particular make of equilibrium ballcock?

An equilibrium ballcock is a make of ballcock , be prepared to pay a fair few quid for it , I can't remember how much exactly they are but I remember they are expensive , prob around the 50 or 60 euro mark . I'd doubt this is the problem tough if the banging happens when you use your tap in the kitchen , I'd say it is something to do with the installation of the new boiler , possibly loose mains pipework where they connected in the filling loop , did they run a new mains pipe or take a connection off in the attic for a filling loop , get someone to turn the tap on and off and you trace the pipe , possibly something as simple as a loose pipe needing clipping .

jgc115

sullzz wrote: »

An equilibrium ballcock is a make of ballcock , be prepared to pay a fair few quid for it , I can't remember how much exactly they are but I remember they are expensive , prob around the 50 or 60 euro mark . I'd doubt this is the problem tough if the banging happens when you use your tap in the kitchen , I'd say it is something to do with the installation of the new boiler , possibly loose mains pipework where they connected in the filling loop , did they run a new mains pipe or take a connection off in the attic for a filling loop , get someone to turn the tap on and off and you trace the pipe , possibly something as simple as a loose pipe needing clipping .

They took a connection off in the attic - and the pipes they used are hard plastic but not bolted down??

gdavis

i agree with sulz,it sounds to me like pipes knocking where they are not bracketed,get somebody to check any new pipework as u turn tap on and off

jgc115

gdavis wrote: »

i agree with sulz,it sounds to me like pipes knocking where they are not bracketed,get somebody to check any new pipework as u turn tap on and off

Thanks gdavis - but I'm wondering why this this didn't happen until after the new boiler was put in and it's seems to be the old vertical cold water feed that is shaking and banging against the side of the vertical rise.

Also just yesterday we think we heard a banging noise from the attic after using the upstairs electric power shower which is also fed from the same cold feed.

gdavis

pipe may have been dislodged from bracket while boiler being installed,who knows! have u confirmed that is what it is?if so,u can pick up a few nail/screw clips urself and fit them