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Discuss Heatrae Sadia unvented cylinder & Tundish in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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Hi All

I have a Heatrae Sadia unvented cylinder... with the usual PVR on the side... which discharges to a tundish which is then connected to a 'fanny trap'.

The problem -
Water trickles through the tundish after about an hour or so of the hot water being heated and the pressure rises. It's only a trickle. To stop this - I have followed the instructions to re-charge the air at the top of the tank. This goes fine - as per instructions. Once air in tank is reset - the tundish trickle stops. Give it about 6 weeks... and its back.

Is this normal - should I have to re-charge the air bubble in the tank every 6 to 8 weeks ?

Thanks,

Tim
 
You need a G3 qualified engineer to work on it my friend. I’m guessing you are not one
 
In which case my friend you will need to enlist one as what you describe isn’t right
 
Looks like your cylinder has developed a fault which might be permanent and can only be sorted by a new cylinder which would be too costly, or a different fix which a G3 plumber would hopefully recommend.
Either way, you need to get a qualified person to do the work.
Cannot say more than that obviously.
 
Looks like your cylinder has developed a fault which might be permanent and can only be sorted by a new cylinder which would be too costly, or a different fix which a G3 plumber would hopefully recommend.
Either way, you need to get a qualified person to do the work.
Cannot say more than that obviously.
Thanks Best. I assumed there must some 'bigger' issue - as I just cant see its normal to have to keep re-charging the air in cylinder. My local plumbing firm have had countless attempt to 'solve' it - and £hundreds later I am still left with the problem. Thanks again.
 
Theres a mod you can do
Thanks Best. I assumed there must some 'bigger' issue - as I just cant see its normal to have to keep re-charging the air in cylinder. My local plumbing firm have had countless attempt to 'solve' it - and £hundreds later I am still left with the problem. Thanks again.

Tim try find a local g3 specialist , it may be hard though , where are you based ?
 
In which case my friend you will need to enlist one as what you describe isn’t right
Thanks Riley - yep - thanks for confirming what I feared. The problem is (and the reason I am on this forum) is that I have enlisted a G3 firm already - and seem to be getting nowhere :-(
 
tbh i would get the g3 engy to fit a new part and do away with the internal bubble as there too much hassle
 
Seems a fairly simple fix for someone who should know
 
Hi All

I have a Heatrae Sadia unvented cylinder... with the usual PVR on the side... which discharges to a tundish which is then connected to a 'fanny trap'.

The problem -
Water trickles through the tundish after about an hour or so of the hot water being heated and the pressure rises. It's only a trickle. To stop this - I have followed the instructions to re-charge the air at the top of the tank. This goes fine - as per instructions. Once air in tank is reset - the tundish trickle stops. Give it about 6 weeks... and its back.

Is this normal - should I have to re-charge the air bubble in the tank every 6 to 8 weeks ?

Thanks,

Tim

You need a G3 engineer without a doubt but the problem is most likely a failed expansion. An external expansion can be fitted of the correct size but only by G3 engineer.
 
Like people have already explained to you. It’s a very easy fix for a g3 engineer.
There is also a fix for the internal bubble which isn’t always guaranteed to work. We had this issue with some of the new cylinders being stored on there side and developed a remedy for it.
 

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