Introduction
This manual provides instructions for the installation, operation, and maintenance of the A. O. Smith 100108260 Aluminum Anode Rod. This anode rod is designed to protect your water heater tank from corrosion, extending its lifespan. It is a replacement part compatible with Reliance water heaters.
Safety Information
WARNING: Always shut off the water supply and power to the water heater before performing any maintenance or installation. Failure to do so can result in serious injury or property damage. If you are unsure about any step, consult a qualified plumber.
- Ensure the water heater is completely depressurized before attempting to remove the old anode rod.
- Wear appropriate personal protective equipment, including gloves and eye protection.
- Handle tools with care to prevent injury.
Setup and Installation
Replacing an anode rod requires careful attention to detail. The following steps outline the general procedure. Specific water heater models may vary.
- Prepare the Water Heater:
- Turn off the cold water supply valve to the water heater.
- Turn off the power supply to the water heater (gas valve for gas heaters, circuit breaker for electric heaters).
- Open a hot water faucet in your home to relieve system pressure and prevent a vacuum.
- Connect a garden hose to the water heater's drain valve and direct it to a suitable drain. Drain several gallons of water from the tank to lower the water level below the anode rod opening. This helps reduce pressure and makes removal easier.
- Locate the Anode Rod:
The anode rod is typically located on the top of the water heater, often beneath a plastic cap or insulation. You may need to remove some foam insulation to access it.
Image: The A. O. Smith 100108260 Aluminum Anode Rod. This image shows the full length of the anode rod, which is designed to be submerged in the water heater tank.
- Remove the Old Anode Rod:
- Use a socket wrench (typically 1 1/16 inch or 1 1/8 inch) and a long breaker bar for leverage. The old rod can be very tight.
- It is highly recommended to have a helper hold the water heater steady, or ensure it is securely strapped down, to prevent it from moving during removal.
- Apply penetrating oil (like WD-40) around the anode rod fitting if it is seized.
- Turn counter-clockwise to loosen. Be prepared for some water to leak out.
- Carefully pull the old rod out. It may be corroded and brittle. If it breaks, you will need to flush the tank to remove any pieces.
Image: Close-up view of the threaded connection point of the anode rod. This is where the rod screws into the water heater tank.
- Install the New Anode Rod:
- Wrap the threads of the new A. O. Smith anode rod with PTFE (Teflon) tape to ensure a watertight seal.
- Carefully insert the new rod into the opening.
- Hand-tighten the rod, then use the socket wrench to tighten it securely. Do not overtighten, but ensure it is snug to prevent leaks.
Image: Side view of the A. O. Smith 100108260 Aluminum Anode Rod, illustrating its uniform cylindrical shape.
- Restore Water and Power:
- Close the drain valve on the water heater.
- Close the hot water faucet you opened earlier.
- Slowly open the cold water supply valve to the water heater, allowing the tank to refill.
- Once the tank is full and water flows normally from a hot water faucet, turn the power supply back on to the water heater.
- Check for any leaks around the new anode rod fitting.
Operating Principles
The A. O. Smith Aluminum Anode Rod functions as a sacrificial component within your water heater tank. It is made of a more electrochemically active metal (aluminum) than the steel tank. This difference in electrical potential causes the anode rod to corrode preferentially, attracting corrosive elements in the water away from the tank's interior lining. As the anode rod corrodes, it protects the tank, thereby extending the water heater's operational life.
Maintenance
- Anode Rod Inspection: It is recommended to inspect the anode rod every 2 years. The rod should be replaced when it is significantly corroded, reduced to half its original diameter, or completely disintegrated.
- Water Heater Flushing: Flush your water heater every 6 to 12 months to remove sediment buildup. Sediment can reduce efficiency and contribute to premature tank failure.
- Replacement Schedule: Consider replacing the anode rod after the expiration of your water heater's tank warranty (typically 6-9 years), or sooner if water quality is poor.
Troubleshooting
- "Rotten Egg" Smell (Sulfur Odor): A depleted or missing anode rod can sometimes contribute to a sulfurous or "rotten egg" smell in your hot water. Replacing the anode rod, especially with a magnesium or aluminum/zinc alloy rod, can often resolve this issue.
- Premature Tank Failure: If the anode rod is not maintained and replaced, the water heater tank itself will begin to corrode, leading to leaks and premature failure. Regular inspection and replacement are key preventative measures.
Specifications
| Brand | A. O. Smith |
| Model Number | 100108260 |
| Part Number | 9000029-005 |
| Material | Aluminum |
| Dimensions | 3/4 inch diameter x 29 inches length (approx. 39 x 2 x 2 inches packaged) |
| Item Weight | 1 pound |
| Compatibility | Designed for Reliance water heaters |
Warranty Information
This product comes with a manufacturer's warranty. For specific details regarding the warranty period, coverage, and claims process, please refer to the documentation included with your purchase or contact A. O. Smith customer support directly. The general warranty description is "Warranty".
Customer Support
For technical assistance, replacement parts, or further information, please contact A. O. Smith customer support. You can typically find contact information on the A. O. Smith official website or on your water heater's documentation.
Note: Always provide your product model number (100108260) when contacting support for efficient service.
