Sun, 17 May 2026 15:43:29 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18396&Focus=310074#Comment_310074 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18396&Focus=310074#Comment_310074 Mon, 19 Jan 2026 21:07:50 +0000 morsing
I installed a Vent-Axia Kinetic quite a few years ago, but this month I have suddenly had a new problem pop up.

We suddenly noticed a damp patch on the ceiling which turned out to be condensation on the outside of the condensation drain pipe. I originally fitted pipe insulation on the first two meters of pipe, can't easily go any further, and water is dripping out from the end of that.

It's very odd. I wasn't quite sure if removing or extending the pipe insulation would help, but I am more puzzled about why this is suddenly happening.

What should I look for? It's like the condensation water is suddenly colder than normal? Oddly it first happened when there was over-night frost but it is still happening now it is warmer.

Thanks]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18396&Focus=310075#Comment_310075 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18396&Focus=310075#Comment_310075 Mon, 19 Jan 2026 21:18:22 +0000 djh
Is the pipe insulation around the condensation pipe sealed along its length and at both ends? If so, where is the drip coming from? If not, then it needs to be!

How is the drain pipe terminated? Ours goes into an internal SVP, for example. If yours is open to the outside or is connected to an external SVP then the air inside could easily get cold enough to be below the dewpoint of the air outside the pipe and cause condensation.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18396&Focus=310076#Comment_310076 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18396&Focus=310076#Comment_310076 Tue, 20 Jan 2026 08:23:12 +0000 GreenPaddy
I'd open the access panel, pull out the heat exchanger, and have a look inside. Swimming pool?? Foggy memory, but there was quite a narrow drain pipe, which I used a bottle washer long brush on a wire, to rod the pipe, and a clump of gouk came out. Problem solved. Give it a go, it only takes a few minutes, and you could give the internals a clean whilst your there.

I suspect you wouldn't get enough condensation on the outside of the condensation pipe to cause ceiling staining. I personally wouldn't bother with insulating the condensate drain, any more than insulating the drain under my sink for when I run the cold tap but I don't suppose it's doing much harm.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18396&Focus=310224#Comment_310224 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18396&Focus=310224#Comment_310224 Sun, 15 Feb 2026 14:24:48 +0000 borpin