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

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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