Drip from bottom of boiler. Vokera Vision 30C

1 Dec 2022
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United Kingdom
I did a bit of searching, but couldn't find this fault elsewhere. I've got a constant (but pretty slow) drip from what seems to be a part of the DHW Non-return valve. It does seem to have an outlet on the bottom of the boiler where it was leaking from and a plastic pipe the plumber left with bits and pieces when it was installed 6 years ago seems to fit this, so I'm wondering if the drip is normal and a waste pipe should have been fitted to drain it away? I'll include some pictures. Its not the condensation pipe. There is a row of 6 in and out pipes under the boiler but this outlet is further back. You can see a drip in the picture. Hope someone can advise.
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Just trying to figure out if this tube is meant to leak water out or if there is a fault and what I might need to replace. Much apprieciated for any help.

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