How to Eliminate a Water Hammer After Flushing a Toilet

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Things You'll Need

  • Tubing cutter

  • Emery cloth

  • Flux

  • Acid brush

  • Copper fittings

  • Bladder tank

  • Thread tape

Water hammer can cause serious damage to plumbing fixtures.

New quick-closing toilet fill valves can cause water hammer situations in many plumbing systems. Ways to eliminate water hammer after flushing a toilet include installing a permanent water hammer arrestor at the toilet supply, installing a whole house bladder tank at the water heater or individual fixture arrestors in several locations throughout the home. Installing a small, pressure-absorbing bladder tank on the cold water supply of the home's water heater is the best solution. Installing the tank will require some plumbing skill. The experienced do-it-yourselfer should have no problem with the pipe connects required.


Step 1

Turn the main water supply off to the water heater, either at its individual fixture cut-off or at the main house supply.

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Step 2

Cut the copper supply pipe with tubing cutters in a horizontal location. Sand the pipe ends and fittings with emery cloth. Coat the outside of the pipe and inside of the fittings with flux; use a small acid brush. Install a tee fitting facing up. Cut a 2-inch piece of copper pipe and insert it into the top of the tee, and then slip on a female adaptor. Solder all the joints with a torch and lead-free solder. Wipe the joints clean with a rag and allow them to cool.


Step 3

Wrap thread tape around the male threads of the pressure tank several time to insure a watertight connection.

Step 4

Screw the tank onto the fitting by hand.

Step 5

Turn the water back on and check for leaks.


Always install the tank between the fixture cut-off and water heater. Installing the tank vertically is always the best choice. The bladder tank should be preset to an adequate pressure; however, adjustments my need to be made.


Not following the manufacturer's instruction could cause personal injury and property damage.


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