Hi, I'm desperately hoping that some clever person out there can help... we have recently installed a water underfloor heating system connected to our combi boiler in our kitchen extension. It is just two loops (both about 50m in length) back to the manifold. Unfortunately the pressure in the underfloor pipes keeps dropping, from 2 bar to 1 bar overnight. We have the underfloor isolated so it isn't a leak elsewhere within our central heating system. We therefore have to conclude that somehow we have leaks in the underfloor pipes, presumably caused when the screed was poured. A plumber suggested I get a thermal imaging camera for my phone and that was supposed to show where the leaks are. Having now tried on many occasions with the thermal imaging we just can't get any decent picture definition of the pipes (we just get a mass hot area showing across the whole floor) and we believe that is because the pipes are now under the layer of screed then under a layer of adhesive which is sticking down a plastic tiling de-coupling mat then with more adhesive and tiles on top. So, does anyone know if there are any other ways of finding the location of the leak before we have to remove all of the tiles, rip up the de-coupling mat and then dig up the screed? Please!