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Draining and Flushing Your Water Heater

The information on this web site is supplemental to the printed instructions that came with your water heater. To reduce the risk of property damage, serious injury or death, read and follow all labels on the water heater and the safety instructions in the printed owner's manual.


Step 1: Tools and Supplies

Garden hose
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  • Garden hose

  • Non-contact circuit tester

  • Flat-blade screwdriver

  • Bucket (optional)

Step 2: Turn Power OFF

Locate the water heater's circuit breaker and turn it OFF (or remove the circuit's fuses).
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  • Locate the water heater's circuit breaker and turn it OFF (or remove the circuit's fuses).

  • WARNING! Before working on the water heater, use a non-contact circuit tester or volt meter to make sure power is off. Working on an energized appliance can cause electrical burns, electrocution or death.

Step 3: Run the Hot Water Until it's Cool

Open a hot water faucet and let the hot water run until it is cool <em>(this may take 10 minutes or longer)</em>.
  • Open a hot water faucet and let the hot water run until it is cool (this may take 10 minutes or longer).

  • WARNING! Be sure the water runs cool before draining the old water heater to reduce the risk of scalding.

Step 4: Turn Cold Water Supply OFF

Turn the cold water supply OFF.
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  • Turn the cold water supply OFF.

Step 5: Connect a Garden Hose to Drain Valve

Connect a garden hose to the water heater's drain valve and place the other end of the hose in a drain, outside, or in a bucket.
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  • Connect a garden hose to the water heater's drain valve and place the other end of the hose in a drain, outside, or in a bucket.

Step 6: Open Drain Valve

Open the drain valve on the old water heater.
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  • Open the drain valve on the old water heater.

  • Some drain valves may be opened with a handle but others require a flat-blade screwdriver.

  • Let the water heater drain completely.

Step 7: Open a Hot Water Faucet

<strong>Opening a hot water faucet will help the tank drain faster.</strong>
  • Opening a hot water faucet will help the tank drain faster.

Step 8: Sediment May Cause Water Heater to Drain Slowly

<strong>Sediment in the bottom of the tank may clog the drain valve and prevent it from draining properly. If you can't get the tank to drain, contact a qualified person for assistance.</strong>
  • Sediment in the bottom of the tank may clog the drain valve and prevent it from draining properly. If you can't get the tank to drain, contact a qualified person for assistance.

Step 9: Turn the Cold Water Supply ON

Once the tank has been drained, turn the cold water supply back ON and flush the tank until the water runs clear.
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  • Once the tank has been drained, turn the cold water supply back ON and flush the tank until the water runs clear.

Step 10: Close Drain Valve

When you're done, close the drain valve and remove the garden hose.
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  • When you're done, close the drain valve and remove the garden hose.

Step 11: Remove the Aerator

<strong>NOTICE: Do not turn electrical power on unless you are sure all of the air is out of the tank and the tank is completely full of water. If power is applied before the tank is completely full of water, the upper element will burn out (dry fire).</strong>
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  • NOTICE: Do not turn electrical power on unless you are sure all of the air is out of the tank and the tank is completely full of water. If power is applied before the tank is completely full of water, the upper element will burn out (dry fire).

  • To remove air from the tank and allow the tank to fill completely with water, follow these steps:

  • Remove the aerator at the nearest hot water faucet. This allows any debris in plumbing system to be washed out of the pipes.

Step 12: Open a Hot Water Faucet

Open a hot water faucet and allow the water to run until it flows full stream.
  • Open a hot water faucet and allow the water to run until it flows full stream.

  • Let the water run full stream for THREE MINUTES to get all of the air out of the tank.

  • You must remove all the air from the tank and allow the tank to fill completely with water before connecting electrical power.

Step 13: Close the Hot Water Faucet and Replace the Aerator

After all of the air has been removed from the tank, close the hot water faucet and replace the aerator.
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  • After all of the air has been removed from the tank, close the hot water faucet and replace the aerator.

Step 14: Turn Power Back ON

Turn the power back ON at the circuit breaker (or replace fuses).
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  • Turn the power back ON at the circuit breaker (or replace fuses).