How To Install A Gas Water Heater

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Gas water heaters are very common for residential use. According to a survey by Energy Star, nearly 53% of the residential water heaters are the gas water heater. A gas water heater has a life of 8-10 years, and it will work appropriately for the tenure if you take care of it. If your gas water heater is not working well and has a leakage to repair every other month, then it is the time to buy a new gas water heater. This article is going to explain to you how to install a gas water heater. It will be helpful if you are going to install the gas water heater yourself.

Before installing a new gas water heater

you will need to remove the old one. Therefore, we are going to tell you the quick steps to remove the old heater. Then we will dive into how to install a gas water heater. So, here are the steps for the removal of an old gas water heater.

  1. Turn off the gas supply to your heater.
  2. Look for the valve near the gas supply and turn it off. The valve will be perpendicular to the pipe when it is off.
  3. Open hot water faucet of your house to drain the boiling water. When the hot water is completely replaced with the new pool, close the tap and the inlet water valve.
  4. Disconnect the gas pipe and venting system from the heater.
  5. To empty your water heater tank, connect a garden hose on the drain valve and drain the water in a bucket.
  6. Now remove the discharge pipe from T&P (Temperature and Pressure) relief valve.
  7. Finally, remove the inlet and outlet pipes and move your old heater to another place.

How to install a gas water heater

Once you have removed the old heater, it is time to install the new one. Make sure to buy the new heater according to your hot water requirement. To install a new gas water heater, follow the following steps.

1) Connect the discharge pipe

After placing your water heater at the right place. Connect the discharge pipe to the T&P relief valve. You can connect the discharge pipe with a floor drain, or you can place a bucket under it.

2)  Connect the inlet and outlet water pipes

Connect the water inlet and outlet to the pipes. Do not open the water valve at this stage. You can use a flexible hose to connect the water heater with the pipes. The flexible hose is safe in the earthquake as well. Do not forget to use plumbing tape to avoid leakage. Tighten the nuts using a spanner.

To check for the leakage, open a hot water faucet, and then open the water inlet valve. Check for the leakage and if there is any later try to tighten the nut. Leave the inlet open until the tank is full and the water flows from the faucet. When there no air left in the tank, close the faucet.

3) Connect the Venting System

Connect the venting hood on the top of the water heater. Use the screws or bolts to tighten it.

4) Connect the gas supply

You can now connect the gas supply pipe with the heater. Make sure that the gas valve and the gas control knob is off. Now join the flare nuts on the gas line and the gas control valve. Connect both using a flexible hose and make sure to use the plumbing tape.

To check the leakage, prepare a water and soap solution. Apply the answer on the gas fittings and turn on the gas. If you see bubbles, then there is a leakage. Try to tighten the nut and check again. You can also use leakage checking solutions to check the leakage. After checking turn off the gas supply.

5) Checking the Ignition

This procedure is the final step, and you need to turn on the gas supply for this. After that move the gas control selector to pilot and press it and hold it. Now press the ignitor button. You can see flame if there is any window to watch the fire. A new model gas water heater has a status light on the control unit. It will start to blink.

Questions and Answers

What can we save the heater during an earthquake?

You can use the flexible hose as it will not break or leak due to the earthquake. It tends to bent. To save the body of the water heater, you can install earthquake straps. These straps will keep the water heater at its place during an earthquake.

How can we prevent corrosion between two metals?

To prevent corrosion between two metals, you need to place dielectric nipples. These nipples will prevent corrosion in different metals. You can connect it between two metals using nuts.

What can we check and stop the leakage?

To check the leakage, apply water and soap solution and see if there is any bubbling. If you see bubbles, then try to tighten the nut. If it does not work, then there can be a problem in the threads of pipe, or you might not have used the plumbing tape.

Can we use the old T&P discharge pipe?

Yes, you can use the old discharge pipe. Make sure that it is in good condition and the treads are clean.

How to check the vent system?

To check the vent system, you need a match stick. Burn a match stick and extinguish it near the vent hood. If the fumes get into the vent pipe, it means the venting system is working fine. However, if the fumes blowback, then there is a problem with it.


To install a new heater, first, check the specification of the old radiator and buy a new one. Follow the steps of how to install a gas water heater in the given order. If you don’t know how to use tools, then please call an installation team. Make sure that the gas supply is off during the installation. After installation, never forget to check for the leakage. Use flexible hose and straps for earthquake protection. If you know how to install a gas water heater, then you can install it or watch the plumber whether he is doing well on not.