• In this video, This Old House plumbing and heating contractor Richard Trethewey installs a heat pump water heater.

    1. Remove access panel to expose the water-supply pipes.
    2. Turn off the water leading to the pipes and drain water system.
    3. Clean the copper hot- and cold-water pipes with an emery cloth.
    4. Hold the arrestor against the pipes and mark cut lines.
    5. Cut through both hot- and cold-water pipes with a close-quarter tubing cutter.
    6. Apply flux to pipe and T-fittings.
    7. Use a propane torch and lead-free solder to sweat the T-fittings onto the pipes.
    8. Wrap Teflon tape onto the threaded fitting on the arrestors.
    9. Thread the arrestors onto the T-fittings.
    10. Use an adjustable wrench to tighten the arrestors.
    11. Secure loose pipes to the wood framing with pipe clips.
    12. Turn the water back on, then replace the access panel.
    • Difficulty: Moderate
      requires mid-level plumbing skills, including how to solder copper pipe
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      Tools List

      • close quarter tubing cutter
        Close-quarter tubing cutter, used to cut copper tubing
      • adjustable wrench
        Adjustable wrench, used to tighten threaded fittings
      • propane torch
        Propane torch, used to solder pipe joints
      • drill
        Drill/driver, used to screw pipe clip onto loose pipes

      Shopping List

      1. Water-hammer arrestor, for silencing noisy water pipes

      2. Copper pipe and assorted fittings, used to connect water arrestors

      3. Solder, flux and emery cloth, for sweating copper pipe 4. Teflon pipe tape, used to form watertight seal on threaded fittings

      5. Pipe clips, for securing loose pipes