Has anyone had to do this? It's looking like my central heating system has a small leak and there is no obvious signs of a leak above ground. The pipework runs under a raised floor so if its leaking from there the flooring will need to come up (aaaargh). I have heard of companies that use thermal imaging to locate leaks, anyone used these? I'm not sure my insurance company would deal with small leaks, burst pipes yes but not little ones that aren't causing any obvious damage, unless anyone can advise otherwise.