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OK. Update: The leak is coming from the tundish. It was hard to spot, because the water on the ceiling actually occurs when the flow through the tundish has slowed to a very slow trickle. So slow, that it no longer streams like the picture in post 25: It's when it slows down so much that the...

Having investigated though a downlight cutout, I can tell that the water marks on the ceiling are along a line where 2 plasterboards meet. Above is a tiled bathroom . So the water might be coming from anywhere in a roughly 4 to 5 foot square area and then trickling to the edge of the...

But could I speed that process up by pouring fresh water into the tundish?

Yes - followed the pipe from the tundish. Can't find any leak yet. I'm leaving it to run a lot longer to see if perhaps a build up is required before the leak starts

Still haven't found the leak. However, shortly after turning the hw on, a small trickle flows into a recepticle which passes it into a copper pipe which is connected to the soil stack. Is this to relieve pressure as the water in the cylinder expands? Is it normal /expected? Here's a wider...

HW cylinder is mains pressure type. I.e. I don't have a cold water tank but I do have a pressure vessel. After terryplumb helped me understand that UFH CH and HW are all fed by same flow and return, I'm starting to think that the leak travels in the ceiling void before coming through the...

Thank you, BTW.

OK. I understand your earlier query about the rads now. Quite weird that ufh doesn't cause the leak. Will check rads tomorrow.

... At least I will only have to drain the top floor though

Not quite, but your reply answers my question. I was hoping the cylinder coil was seperate from the radiators and ufh, only because it felt like that might have made the scope of the job smaller - less to drain etc

Boiler and cylinder are in a loft conversion (where there are two bedrooms with rads and a shower room). Is the hw circuit independent of rads? Edit : sorry, didn't actually answer your question. The leak drips through the ceiling of the room below the loft conversion. The boiler is at one side...

Don't think so. Certainly not the underfloor heating. Will try with the rads tomorrow am. But as it stands I have a high confidence that it's the indirect hw circuit specifically.

It's definitely the indirect HW cylinder circuit. As soon as the pump kicks in to heat the cylinder, the leak starts. As soon as I turn the hot water off at nest thermostat, the leak stops.

I might start cutting the ceiling this weekend and will report my findings, but in the meantime I would still welcome any thoughts on the questions above.

Hi all, the circuit that heats my HW tank has developed a leak. What are my options for fixing it? * The leak is in the copper pipe run between the boiler and the tank - i.e. not at the connection to the boiler nor at the cylinder. * It only drips through the ceiling when the boiler fires up to...

No - I've got the 250l version. In the tech specifications table in that image (very small print) it shows that 2 are standard for that size tank. So just a bit of a weird design. It would heat up quicker using 2, but the gledhill support guy (whom I don't hold in high regard) really tried to...

Yes, but then they would have made a poor choice designing their system with this indirect horizontal cylinder whose elements can only heat up the upper half of the tank!

They were definitely in parallel, 2.5mm from CU, into one FCU, into second FCU and then into circulation pump. I contacted Gledhill and the guy there said that the two immersions are indeed at the same height and therefore heat the same water space (implying that there isn't any clever...

I would have thought quite a long time. The intention was to heat up the whole tank - so I would have planned to leave it for an hour or so. And I think I did that on at least two or three occasions. (Edit: Actually I might have even though of legionella, so might have deliberately left it on...

No. This was a whole house rewire and completely new plumbing throughout as well. I can at this stage though question the quality on the contractor :(