My neighbor's hot water tank is the loudest one I have ever heard. It is electronic ignition style (Atwood I think). He adjusted the air flow sliding the cover almost closed. It quieted down some but the flame is now really yellow. To get a good burning (blue) flame he has to open the air nearly all the way, but it sounds like a jet engine when set like that. He is going to clean the tube and then see if it helps, but if anyone has any suggestions please help. tks in advance