What Causes Banging Sound in Your Hot Water Heater? There is a lot of explanation on what are the source of loud sound in your water heater. In some cases, the banging could be caused by pieces of metal or other objects that have become lodged in the heating unit's pipes. In other cases, the banging could be the result of the water heater itself hitting against something else inside your water heater. However to know more what are the causes you need to identify and locate the sound or noise. Where can you ask for help to fix the banging sound in your Water Heater? Contact your residential plumber near you they are equipt and knowledgeable in dealing with these problems. Hot Water 2Day supply and install gas and electric hot water systems in Canberra, Newcastle, Central Coast & Port Stephens. Call us today!