Has anyone used a leak detection service?

[ADMum20]

Our relatively new boiler is losing pressure... the plumber has visited and can’t see anything obviously wrong. All the radiators are working ok so we don’t think it’s pressure release causes by a blockage

I’m assuming it’s a leak somewhere (no visible signs) Has anyone used a leak detection service?

If so, was it expensive and did it work?

I'm sure I once heard that you can fill the system with a leak repair solution and it fills all the leaks
Don't know if it works or is good practice though

We have this problem and after 4 years of this have gradually been finding and fixing leaks e.g. water running down the side of a radiator resulting in a little puddle, or a stream of water coming from a downlighter. Everyone we've called in seems to throw their hands up and say oh, well, nothing to be done - it's infuriating!
But we did use a leak detection service in a previous house where one wall was soaking wet and no-one could find the source. They were amazing and pinpointed it quickly (despite it being very difficult to find). But with a whole heating system, with pipes running under every floor, it might be a lot harder to find a leak.

Check that the pressure vessel for the heating isn't failing as if so it spits water out then hot. Our BG plumber didn't spot that.

Some plumbers don't like leak sealer in the heating due to worried about wrecking the boiler.

I agree with @Mareig10 check the pressure vessel.

The overflow may only run intermittently and my plumber missed it first time.

As it was my problem was slightly unusual, the water pressure coming into my property was too high and was causing issues with the pressure vessel.

We fitted a pressure reducing valve to the water inlet pipe and have had no problems since.

Ok that’s interesting both, thanks. I have no idea where the pressure vessel is... would that be near the boiler or immersion cylinder?

Mine sits in the top of the casing of the cylinder OP.

Do you know the make of your Cylinder? Mine is an OSO and the pressure vessels can be seen by lifting the top plastic cover. Previously I had a Megaflo in which the pressure element was integral to the cylinder.

Of course I am assuming you have an unvented cylinder. If not, and you simply have an old fashioned hot water cylinder then my thoughts about it being a pressure vessel issue might be a red herring.