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How to Bleed Hot Water Lines?

Published in Plumbing Maintenance 3 mins read

To bleed hot water lines, you essentially need to flush out any trapped air that might be causing problems, such as sputtering faucets or reduced water flow. Here’s how:

Steps to Bleed Hot Water Lines

  1. Open all hot water faucets and taps: This includes faucets in your sinks, showers, and bathtubs.

  2. Turn on the main water supply: Ensure that your main water supply is fully opened, allowing water to flow freely into your plumbing system.

  3. Allow water to flow: Let the hot water run through all the open faucets and taps for 10-15 minutes.

    • Listen for steady sounds: During this time, pay attention to the sound of the water flowing. You should be hearing a consistent hum without any unusual noises like sputtering or gurgling.
  4. Check for a steady stream: As the air is bled from the system, you should observe a consistent, steady stream of water coming out of each faucet and tap.

  5. Turn off faucets: Once you see steady water flow and don't hear any strange noises coming from the pipes, turn off all the faucets and taps.

Why Bleeding Hot Water Lines is Important

  • Removes Trapped Air: Air pockets in your hot water lines can cause inconsistent water flow, noises, and even reduced water pressure.
  • Improves Efficiency: By removing air, you ensure your hot water system works optimally and efficiently.
  • Prevents Damage: Trapped air can contribute to corrosion and other plumbing problems over time.


Step Action Expected Outcome
1. Open Faucets Open all hot water faucets and taps. Water is ready to flow and expel air from system.
2. Turn on Water Supply Turn on the main water supply. System begins to fill and push out trapped air.
3. Allow Water to Flow Let water run for 10-15 minutes. Air is expelled and a steady stream begins to form.
4. Check for Steady Stream Inspect the water flow at each faucet. Consistent flow and no unusual noises are present.
5. Turn off Faucets Turn off all hot water faucets and taps once the air is gone. Bleeding process is complete.


This simple process effectively removes air and should restore proper function to your hot water lines.

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