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Transam, Expertgasman, as I said earlier, I am not a heating/plumbing engineer, so I do not know the exact details of how a pressure test is performed. However, after we had the problems (as is always unfortunately the way) a friend of my wife told us how she had recently had a combi...

JohnD, they could see where the leak was coming from and then dug up the floor. They then saw the pipe was heavily corroded, and replaced the leaking section with a new length of pipe. I fully appreciate that it is not reasonable for a business to be held responsible for installations...

PS: Thanks to everyone who went to the trouble to post replies on this topic, it is much appreciated.

Just to update the thread (for reference for anyone else in this situation)following further independent advice: 1) The Institute of Plumbing & Heating have advised that the pressure test should have been performed over a duration of at least 2 hours in order to allow weak pipes to be...

Agile, thanks for the input The pipes are buried under the floor in concrete, and I was not made aware (either verbally or in writing) with the associated risk. As I mentioned, I was aware of the risk of going to a combi boiler because of increased water pressure, but did not know...

Thanks for the prompt reply Andy. They did not warn me about the risks before, though I was aware because I had heard of people with similar problems, and was in 2 minds whether to go with a combi for that reason. The company is not a major national, but are reasonably large (i.e. not a one...

I had a Combi boiler installed 3 months ago and from the day of installation have had problems with the existing CH pipes leaking uder the higher pressure of the Combi. No new pipes were fitted, the leaking pipes were exisiting ones and are fitted underfloor and have apparently corroded with...