hi can anyone help with a problem with my boiler. i had a heatline vizo installed 2 years ago, and shortly after it started making a noise whe it was switched on and also when the hot water is turned on at the tap or shower. british gas have been out to check it and say there is nothing wrong with the boiler itself. Heatline have also been out and say the same thing and suggest i go back to the person who installed it. A friend of a friend who is corgi reg took a look and suggested it may be the size of the supply pipe to the boiler as it is only 15mm and should be 22mm. i understand that this is a new requirement that only came into force last year. i have been in touch with the person who installed it but would like some solid evidence as to what is wrong with it because i feel he is going to fob me off.