Discuss Heatrae Sadia unvented cylinder & Tundish in the Plumbing Forum | Plumbing Advice 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
 
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Riley

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You need a G3 qualified engineer to work on it my friend. I’m guessing you are not one
 
OP
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You need a G3 qualified engineer to work on it my friend. I’m guessing you are not one
Thanks Riley - yep I know that - and correct I am not one - and I have no intention of working on it.
 

Riley

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In which case my friend you will need to enlist one as what you describe isn’t right
 

Best

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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.
 
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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.
 

townfanjon

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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 ?
 
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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 :-(
 

ShaunCorbs

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tbh i would get the g3 engy to fit a new part and do away with the internal bubble as there too much hassle
 

Riley

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Have you asked them if they’re G3
 

Riley

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Seems a fairly simple fix for someone who should know
 

king of pipes

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Yes mate I am Norwich way i can take a look if you're getting nowhere Tim pm me cheers tkop
 
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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 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.
 
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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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