Undiscoverable water leak

[Aargent]

We have a constant water leak which is after the pump. I cannot find it nor can James Hennessy. an excellent plumber, is there a specialist firm, with specialist equipment, that could trace and fix this leak. We cannot have water running all the time. Switching it off at the main will not solve the problem.

[ast]

I have used James before and found him very competent so why can he not find the leak, if its after the pump it must be under pressure so easier to find. Strange one.

[Paul]

If you can turn off the supply to the hot tank and hot supply to the house and see if it stops.
If it stops then it is on the hot side.
Paul