How to eliminate a water hammer after flushing a toilet

Written by kelly schuler
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How to eliminate a water hammer after flushing a toilet
Water hammer can cause serious damage to plumbing fixtures. (faucet image by Lynne Davis from

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 arrester at the toilet supply, installing a whole house bladder tank at the water heater or individual fixture arresters 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.

Skill level:

Things you need

  • Tubing cutter
  • Emery cloth
  • Flux
  • Acid brush
  • Copper fittings
  • Bladder tank
  • Thread tape

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  1. 1

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

  2. 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.

  3. 3

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

  4. 4

    Screw the tank onto the fitting by hand.

  5. 5

    Turn the water back on and check for leaks.

Tips and warnings

  • 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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