Heating leak under a cottage's later concrete floor
The property
An older brick cottage in the town. A previous owner replaced its old floor with concrete and laid the downstairs heating pipes in it.
The problem
The gauge sank far enough to need refilling twice weekly, and the floor by the sitting room hearth felt warmer than the rest. The boiler had passed its checks.
How we found it
Shutting off the upstairs radiators did not stop the pressure falling, so the leak was downstairs. Hot radiators then let the thermal camera pick out heat fanning from the hearth; tracer gas confirmed it after draining.
The outcome
We marked the spot by the hearth and photographed it. For our repair, quoted separately, one small square of concrete was opened; the rest of the floor stayed down.