We had a Vaillant Ecotec Boiler installed in 2014 and we have had nothing but problems. The install went well enough but we continued to have problems with the flue leaking, they sent out an engineer to replace part of the flue several times as the boiler refused to work due to this problem and water was collecting on the top casing, the kept on happening until the entire boiler had to be replaced due to corrosion. Fast forward to now (20/02/2017) and the flue has leaked again and now we are without heating or hot water for the last week. Vaillant sent out an engineer and he has condemned the boiler due to safety concerns. We are still waiting for Northern Gas Heating to come back to us with the date of when the intend to repair it. I shall need to contact Gas Safe to report these cowboys.