Hot water heater making knocking noise

Hot water heater making knocking noise. Water is the basic need of everyone. We use water for drinking and cleanliness. Water is used to wash pots.

We also take a bath and wash our clothes with water. In summer, we drink and consume cold water, but everyone needs hot water in winter.

It is difficult to take a bath and wash pots after dinner with cold water. So water is heated and consumed. If the quality of the heater is good, then water is heated in no time. Usually, different water heaters are used by people.

Traditional, instant-on water heaters, suction pumps, stellar/solar, and shrink are different kinds of hot water heaters we use for heating water.

Hot water heater works on electricity and gas both. Both water heaters work in the same way. Hot water heaters are fixed at different places in homes, in basements or roofs, etc. They look like big metal barrels and big drums.

The drum is filled with water, and the heating system is fitted inside or bottom. The outside of the drum looks simple, but the inside design is innovative. The heating mechanism, heat out the pipe, stop valve, switch, pressure relief valve.

Hot water heater making knocking noisehot water heater making knocking noise 2022

When water is heated up in the water, then water bubbles come up from the bottom due to the settlement of sediment. When this matter of sediment breaks down and becomes loose in the barrel, then a harsh sound is produced due to the hot water which comes up through sediment matter in the bottom.

When hot water makes its way through the bottom, it makes a knocking noise which is sometimes very annoying.

Sizzle, clattering, ticking, shriek, and popping are different types of sounds that are produced from hot water tanks.


Sizzling and rambling are the most common sounds which water heaters produce while heating water. When sediment in water increases at the bottom, then it may behave or react with the heating element of the tank, and sound is produced due to this which we here.

We can avoid this sound by clearing the water after some time and removing all the sediment from the bottom of the tank.


When sediment water in the bottom is increased, then water gets plucked in between the heating element and matter in the bottom.

When water heats up, then it tries to come up into the tank from the sediment, a knocking sound in the water is the cause of this.

It is time to clean the tank from sediment. This can be done by yourself or by hiring some technician.


If you are heating water to take a shower or washing machine, then you start hearing a ticking sound suddenly out of the water tank, then it is due to the rise of water pressure.

If the water pressure is changing, then the sound will produce. The first thing to do is find a pressure-decreasing valve and reduce the water pressure in the tank.

Tickling sound, which is irritating. You will remove it after adjusting the water pressure valve.


Sometimes, a high-pitched sound comes out of the water heater. It is due to the restriction of water flow in the tank.

If you face such a problem, then see the valve, which is sometimes closed by anyone. Water in the pipes is stopped due to the close of the valve.

All we just have to do is re-open the valve and let the water allow to enter the pipes of tanks at suitable pressure.


What is the reason behind the increase of sediment in water?

The main reason behind the sediment in the water is that amount of alkali in the water is more in that area.

Why my water heater is continuously leaking?

It is due to the temperature and pressure valve. If the valve is set at a high-pressure temperature or pressure, then it will cause leakage in the tank due to no space.

How long does a water heater tank usually work?

A good quality water tank normally works for up to 8 to 12 years and even more if we use it carefully.


Water heater tanks are used in winter to take baths and wash pots and clothes. Water heaters look simple from the outside, but the inside design is not simple.

The main part of the heater is its valve. Always set the T&P valve at the normal position so water can easily flow and heat up in the tank. If it is in the proper position, no knocking sound will come.

After some time, one other thing to do is that drain and clean the sediment from the bottom of the heater then, no disturbance sound will come.

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