Unvented cylinder constantly dripping (Ed.)

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Hi All

Hoping for a bit of plumbing help. Our tundish is always dripping.
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It always (and I mean always) drips, 24/7 but since the heating has been back on its more like a flow of water as pictured. I assume its an overflow from the hot water tank but I dont understand why it would always be dripping. There is a pipe outside our house where I assume the water runs to and the path where the water exits is almost always wet if not puddling. This has been since we moved in a couple of years ago, its just suddenly gotten worse with the cold weather and heating being on.

I am getting a plumber out but as with all things it would be amazing to understand what it is before hand so I can ensure I am getting the right assistance.

Can anyone explain to me what this is and if the severe dripping is a serious issue or not?

Many thanks in advance.
 
Last edited:
Sorry not a plumber but watch it doesn't freeze in this weather where it exits the house.
 
You have a minimum of an expansion related issue, if it was serviced annually by a G3 registered engineer, you wouldn’t have this issue.
 
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