Power flushing a water heater removes sediment buildup to improve efficiency and extend its lifespan. Here's how to do it:
Steps to Power Flush Your Water Heater
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Turn off the Water Heater and Water Supply:
- First, turn off the power to your electric water heater at the circuit breaker or shut off the gas supply to your gas water heater. Let the water cool down for several hours to avoid scalding.
- Next, shut off the cold water supply valve to the water heater. This is usually located on the pipe leading into the top of the tank.
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Connect a Garden Hose to the Drain Valve:
- Locate the drain valve near the bottom of the water heater tank.
- Attach a garden hose to the drain valve.
- Run the other end of the hose to a safe drainage location, such as a floor drain, utility sink, or outside to your yard (ensure proper drainage and no environmental harm).
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Run Hot Water and Open the Drain Valve:
- Open a hot water faucet somewhere in your house. This will help prevent a vacuum from forming in the tank, allowing it to drain more effectively.
- Open the drain valve on the water heater. Let the tank drain completely. The initial water will likely be murky and full of sediment.
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Turn the Water Supply Back On to Flush the Tank:
- With the drain valve still open and the hot water faucet open, slowly turn the cold water supply valve back on just enough to allow water to flow into the tank while it continues to drain.
- The incoming water will stir up any remaining sediment in the tank. Continue this process until the water running clear from the drain hose. This might take several minutes. Adjust the cold water supply valve as needed to maintain a steady flow without overwhelming the drain.
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Close Drain Valve, Fill Tank and Turn On Water Heater:
- Close the drain valve tightly.
- Turn off the hot water faucet you opened earlier.
- Fully open the cold water supply valve and allow the tank to fill completely. You will hear the water flowing.
- Once the tank is full and the air is purged from the lines (water flows steadily from the hot water faucets without sputtering), turn the power back on to your electric water heater or relight the pilot light on your gas water heater according to the manufacturer's instructions.
Important Considerations:
- Frequency: How often you need to flush your water heater depends on the hardness of your water. If you have hard water, you may need to flush it every six months. Otherwise, once a year is usually sufficient.
- Safety: Always turn off the power or gas supply before working on your water heater. Be cautious of hot water, even after it's cooled, as it could still cause discomfort.
- Sediment Buildup: Regular flushing prevents excessive sediment accumulation, which can reduce the tank's efficiency and lead to premature failure.
- Professional Help: If you're uncomfortable performing this task yourself, consult a qualified plumber.
Flushing your water heater is a simple maintenance task that can significantly extend its lifespan and maintain its efficiency.
