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How to Bring Hot Water Outside

Ask This Old House plumbing and heating expert Richard Trethewey helps a homeowner add an outdoor faucet with both hot and cold water


  1. Before doing any plumbing work, turn the water off at the water main.
  2. Use the compact pipe cutter to cut the cold line to the existing outdoor faucet. With the line cut, remove the old faucet.
  3. Measure the center to center distance between the hot and cold pipes on the new faucet.
  4. Transfer that measurement to the wall, using the old cold line hole as a reference for the new hot hole.
  5. Use the drill with a hole saw attachment to drill a hole for the new hot water line.
  6. Loosen and remove the stem units so the washers on them aren’t destroyed by heat when soldering.
  7. Use thread sealing tape on the male ends of the wall hydrant, then thread on copper female adapters.
  8. Cut two pieces of copper pipe about a foot long to fit through the wall.
  9. Clean the inside of the female adapter and the outside of the copper pipe using plumber’s sand paper and apply flux to those same spots. Solder the joint together using the torch and solder.
  10. Apply silicone caulking to the back of the hydrant and push the assembly with pipes into the holes in the wall. Secure with all weather screws.
  11. Use copper pipes and fittings to make the connections from the backside of the hydrant to existing hot and cold water lines inside. Add ball valves to each line for future service.
  12. Reinstall the stem units and turn the water back on.


The Woodford Hot and Cold water frost-free outdoor faucet can be found at the local plumbing supply center or online at Woodford Manufacturing Company.