What Could Be Wrong With The Water Heater If It Creates Popping/Knocking Noise


The water heater is made up different components and elements. ?With the constant usage, the performance and efficiency will be affected without being known to you. They might degrade and turn to harmful if proper care is not taken. Similarly if you hear rumbling noise or loud noise resembling to cooking of popcorn or knocking, then you have to take immediate step to rectify it.

The main culprit is the building of sediments or minerals in the water heater disturbing the working of anode and other elements. But the question still remains as to what went wrong suddenly and how it can be diagnosed before it causes extensive damage. Here?s the reason and steps required to repair the fault.

Reasons of sediments build-up:

The water that we use and drink is made of very essential minerals. These minerals found in abundance in hard water are the enemy of water heater, since they are basic cause of getting stuck and settling down in the water heater tank.

Once the sediments settle down in the water heater tank, it will decrease the efficiency and increase your financial outflow. The chances of your tank getting damaged are more, since the water heater will exert extra efforts to give the desired temperature.

Reason for knocking noise:

The water heater are made of elements and usually located at the bottom of it. When the sediments settle down, it blocks the elements. As soon as the water heater starts, the element does not work and noise starts in the initial stages. This noise is similar when steam is generated with covered boiling water pot.

The repercussions of sediments:

The lower element exerts more pressure to work and eventually damage other components. This can cause either longer hours to heat, overheating or deteriorate the inner lining / protective surface of the water heater tank. Ultimately, it might result to burn out or lead to leakages.

What is the solution?

You can fix the issue by flushing the water heater tank. In order to understand how the process is done, you will have to understand certain parts, their functioning and their location. You can learn more about it from the manufacturer?s installation manual or ask your nearest helpline.

Follow the following procedure to flush the water heater tank carefully or take the help of nearest experienced plumber to get the job done.

  • Turn off the water heater and turn the main switch off in case of electric water heater or switch off the gas pilot in case of gas water heater. Take care to wear heavy-duty gloves to avoid any accident.
  • Close the cold-water valve and allow the water heater to cool for minimum 30 minutes.
  • Use garden hose and connect one side of it to drain valve and leave another end at a place where you can safely drain the sediment water.
  • Open the pressure relief valve so that sediment water comes out of the hose.
  • After the water is drained out, close the pressure relief valve to open the cold water supply. The flushing process shall start. Open and close the cold water valve until you see the clear water coming out of the drain.
  • Close the drain valve, disconnect the hose and turn the cold water on.
  • Turn on the heater once the water tank is filled up with water.

Thus, you have to diagnose and take early precautions to clean the sediments and fix the issue before it create more damages.