Flushing Your Gas Water Heater

Flushing the State Proline Gas Water Heater — Get hard water (calcium) out of tank
This is just a tipsheet. You MUST read and follow the instructions for your particular water heater.  Printer friendly version may be available at bit.ly/water-heater-pdf

This page: bit.ly/gas-water-heater

  1. Gas Heater, turn off gas and then water
    1. AC: Unplug the AC pump that's connected to the wall.
  2. Close main valve lever above water heater
  3. Turn the pilot knob to 'PILOT' or 'VACATION'
    1. Option (deep flush): Turn on hot water in tub so that hot water can be running through (pump the valve lever a few times to create surges to mix up sediment)
  4. Connect hose to drain valve: give a short turn or two with Channel Locks so doesn't leak; can use a bucket to see output
  5. Use screwdriver to open valve
  6. Start some air movement by lifting pressure-relief valve OR loosen but don't have to disconnect one of line nuts on top (rightside is cold)


  1. Reset relief valve OR Open hot water in tub. Push spring-loaded pressure valve down till snaps in place
  2. If applicable, re-tighten nut on top (replace older flex hose if necessary)
  3. Open main valve lever at the top near the ceiling to recycle the tank (5-7 min)
  4. Turn off hose valve (with screwdriver)
  5. Go inside house, turn on the hot water lines to each fixture (to blow air out); about 5 min
    1. If gas heater, refill the tank before turning it back on or can burn out heating element.
      1. Turn on gas valve.
    2. Turn pilot back on if applicable (this can be dangerous, so closely follow your own manufacturer's instructions).
    3. Disconnect hose; Re-plug in AC pump
    4. Gas and Relief Valve: www.youtube.com/watch?v=K6-SquuvHFE
    5. *** pilot light: www.youtube.com/watch?v=N2V4vFKDP6Y
    6. www.youtube.com/watch?v=W5nuZj3wPwA
    7. www.youtube.com/watch?v=6nZjHTX91ZQ
    8. www.youtube.com/results?search_query=how…
    9. www.youtube.com/watch?v=TCDfEzU72E0