How to Weld a Hot Water Tank

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Things You'll Need

  • Wrench

  • Soap

  • Water

  • Dry cloth

  • Welding torch

  • Welding mask

  • Welding gloves

  • MIG welding wire

The hot water tank in your home is used to heat the water that flows through the faucets. The water tank is coated with a polymer material that prevents the tank from rusting. However, a hot water tank may get damaged which can lead to leaks. Damage can include cracks in the tank or a tank pipe busts from cold weather. Welding cracks and pipes on a hot water tank is one method to fix a leaking water tank. You may choose to replace the water tank or fix it yourself. Welding a water tank can be completed with the right tools, saving you the expense of replacing the hot water tank.


Step 1

Turn off the water flow from the hot water tank. Disconnect the hoses on the end of the water tank with the wrench. Redirect the end of the hose to the outside of the house. Turn the tank flow on to empty the water tank. Disconnect the hose connected to the tank.

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Step 2

Inspect the tank weld seams and valve seals. Locate the area of the tank with the crack. Wash the cracked area with soapy water. Wipe the area clean with the cloth.


Step 3

Put on protective welding gear, including gloves and a welding mask.

Step 4

Turn the acetylene gas valve on. Click the striker to ignite the welding gun. Increase the gas slowly to increase the flame.


Step 5

Weld the cracked areas of the tank. Feed the welding wire through the welding gun to the location of the crack on the tank. Turn the acetylene gas valve off once completed.

Step 6

Reassemble the hot water tank hoses. Tighten the hoses with the wrench. Refill the tank with water.


Prevent burns by wearing long-sleeved clothing.

Clear the work area from grease and oil products.


Do not leave the gas valve turned on for long periods of time.

Do not attempt to light the torch with other materials besides the welding striker.

Weld in a well-ventilated work area.


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