To empty an AO Smith water heater, turn off the power, shut off the cold water supply, attach a hose to the drain valve, and open the valve to drain the tank.
Maintaining your AO Smith water heater by regularly draining it is crucial for performance and longevity. Sediment buildup can reduce efficiency, cause strange noises, and even lead to leaks. Follow this comprehensive guide to safely empty your unit.
Why Draining Your Water Heater Matters
Mineral deposits naturally accumulate in all tank water heaters over time. Hard water accelerates this process. Flushing removes sediment that can:
- Reduce heating efficiency by up to 30%
- Cause premature tank failure
- Create rumbling or popping noises
- Discolor your hot water
For optimal performance, AO Smith recommends annual flushing. Homes with hard water may need to drain every 6 months. Learn about ideal water heater temperatures to maximize efficiency.
Safety Precautions Before Draining
Turn Off Power Source
For electric models:
- Locate your circuit breaker panel
- Switch off the breaker labeled “water heater”
For gas models:
- Find the thermostat dial
- Turn to “Pilot” or “Off” position
Shut Off Water Supply
Locate the cold water inlet valve above your heater. Turn it clockwise until fully closed. For added safety, consider shutting off your main water supply.
Prepare Your Workspace
- Wear thick gloves and safety goggles
- Have towels ready for spills
- Position a 5-gallon bucket near drain valve
- Connect a standard garden hose (3/4″ diameter)
Step-by-Step Draining Process
1. Release Pressure in System
Open a hot water faucet in your home (like a kitchen sink). This prevents vacuum lock and allows smooth draining.
2. Connect Drain Hose
Attach one end of your garden hose to the drain valve at the base of the tank. Route the other end to a floor drain, outside, or into your bucket.
3. Open Drain Valve
Slowly turn the drain valve counterclockwise. Expect an initial burst of water as pressure releases. Let water flow until it runs clear (typically 10-20 minutes).
4. Flush Remaining Sediment
Briefly turn the cold water supply back on to stir up remaining debris. Repeat draining until water runs completely clear.
After Draining Your Water Heater
Refilling the Tank
- Close the drain valve tightly
- Disconnect the garden hose
- Turn cold water supply back on
- Leave a hot water faucet open until steady flow occurs
Restoring Power
For electric heaters:
- Wait until tank is completely full
- Restore power at circuit breaker
For gas heaters:
- Follow manufacturer’s relighting instructions
- Verify proper burner operation
Troubleshooting Common Issues
| Problem | Solution |
|---|---|
| No water flows from drain | Check for clogged valve – use a thin wire to clear debris |
| Water continues draining slowly | Sediment may be blocking valve – repeat flush cycle |
| Leaking drain valve | Replace washer or entire valve if damaged |
For persistent issues, consult AO Smith’s technical literature or contact a professional plumber.
Maintenance Tips Between Drains
- Test the pressure relief valve monthly
- Inspect the anode rod annually
- Consider installing a water softener if you have hard water
- Monitor for signs of sediment buildup
Proper maintenance extends your water heater’s life and ensures efficient operation. For more home heating solutions, explore our guide to optimal pool heater temperatures.
