Leak on heating system where is manifold

lomb

Can anyone tell me where around 30 years ago the flow and return pipes from a boilerhouse would manifold off to the rads circuit. Where is this manifold?
The pipes are buried in concrete and I suspect a leak under the concrete as the 28mm pipe(one inch) are heading into concrete without denso tape from the boilerhouse . The rad pipes are 15mm(1/2) and hotpress are 22mm(3/4)
There is no leak the expansion vessel, prv as these were letting by and have been replaced or at any of the rads and the hot water cylinder has been replaced. Heat exchanger is ok as no water in a bag tied to the condensate pipe over 24hrs. All copper coming up from concrete to rads is pvc coated so presumably would be ok so its from the boilerhouse to manifold likely.

Robbie.G

lomb wrote: »

Can anyone tell me where around 30 years ago the flow and return pipes from a boilerhouse would manifold off to the rads circuit. Where is this manifold?
The pipes are buried in concrete and I suspect a leak under the concrete as the 28mm pipe(one inch) are heading into concrete without denso tape from the boilerhouse . The rad pipes are 15mm(1/2) and hotpress are 22mm(3/4)
There is no leak the expansion vessel, prv as these were letting by and have been replaced or at any of the rads and the hot water cylinder has been replaced. Heat exchanger is ok as no water in a bag tied to the condensate pipe over 24hrs. All copper coming up from concrete to rads is pvc coated so presumably would be ok so its from the boilerhouse to manifold likely.

If a manifold system was used its more than likely in the hotpress or a press downstairs
It's also very possible it was piped conventionally
With means the rads are teed of the main flow and return

lomb

Thanks likely I need a thermal imager to see whats happening.

lomb

To save myself the cost of thermal imaging I have found how the bare 28mm heating pipes(no denso)come into the house. Also the expansion/contraction when stuck in concrete cant be good.
Im putting 2 lever valves on the flow/return and will isolate and pressurise the section under the concrete to double check if the leaks are there but what is the likleyhood of there being pin hole leaks in copper when buried directly in concrete for many years?. The leak has to be there as there is no condensation/wet rooms present and the leak has been there for years with the system a closed system connected to the cold storage tank through a (failed open) one way valve pressurising to .5 bar it loses .1 bar every 2 days.
If I was getting a first fixed heating system I would insist on qualpex pipes with no joints coming in behind rads and compression or push fit coming from the wall so the points are accessible.
I can see the fun in putting new pipe work in not:mad: