How to Drain a Water Heater
When you decide to drain your water heater, you’ll need to follow a few essential steps to ensure the process goes smoothly and safely. In this article, we’ll be covering everything you need to know about how to drain your water heater, including the tools, the steps for various types of water heaters, how long it takes, and more.
Steps to Drain Your Water Heater
- Disable the recirculation pump (if applicable): If your system includes a recirculation pump, disconnect it from the power supply. If not, proceed to the next step.
- Turn off the heat source: For gas water heaters, switch the burner control knob to the “pilot” setting. For electric water heaters, disconnect the power by either unplugging the unit or switching it off at the circuit breaker.
- Shut off the water supply: Most water heaters have a shut-off valve on the cold water line leading to the top of the tank. Turn off the water supply here. If your system lacks this, you will need to shut off the water at your home’s main supply line.
- Attach a hose to the drain valve: Connect a garden hose to the drain valve located at the bottom of the tank. Run the other end of the hose to a suitable drainage area, such as a floor drain, outside to the driveway, or into a sewer line. If a hose is not practical, you can use a bucket to catch the draining water.
- Open the drain valve: Once the hose is securely connected, open the drain valve to release the water. This can often be done by hand, but you may need a screwdriver. Be cautious as the water will be hot.
- Let air into the tank: The water may drain slowly due to a vacuum inside the tank. To break this vacuum, you can:
- Open the pressure relief valve on the tank, if available.
- Loosen the piping at the top of the tank to allow air to enter.
- Turn on the nearest hot water faucet to relieve pressure and get the water flowing.
- Completely drain the tank: Allow the water to fully drain from the tank. Depending on the size, this may take 5-10 minutes. Be careful as the water may still be hot.
- Flush the tank: If you loosened any piping earlier, tighten it before proceeding. Then, turn the cold water supply back on and let the water run through the tank. You can tap the side of the tank to dislodge any remaining sediment. Let the water flow until it runs clear, typically for 5-7 minutes.
- Close the drain valve and disconnect the hose: Once the tank is clean, close the drain valve securely. Remove the hose and ensure all connections are tight to prevent leaks.
- Release air from the system: Turn on every hot water faucet in your home to release any trapped air. Let the water run until normal pressure is restored, and any sputtering stops.
- Reconnect the recirculation pump (if applicable): If you disconnected a recirculation pump earlier, now is the time to plug it back in.
- Restore the heat source: For gas water heaters, turn the burner back on. For electric units, reconnect the power or switch the system back on at the circuit breaker.
Tools Needed
Draining a water heater doesn’t require much. Here’s a list of the tools to prepare yourself for the process:
- Garden Hose: To connect to the drain valve and direct water to a drainage area.
- Bucket: Useful if you don’t have a drain nearby or want to monitor the water’s sediment levels.
- Screwdriver: May be needed to open the drain valve if it can’t be turned by hand.
- Adjustable Wrench or Pliers: To loosen or tighten any fittings, valves, or piping connections.
- Towel or Rags: To clean up any spilled water and protect the floor around the water heater.
- Gloves: To protect your hands from hot water or sharp edges on the heater or tools.
- Flashlight: Helpful for seeing under or behind the water heater, especially in dimly lit areas.
- Teflon Tape (optional): For resealing any connections that need to be tightened after draining.
How long does it take to drain a water heater?
With the necessary tools in hand, the average tank typically takes 20-30 minutes to drain, but heavy sediment can prolong this. Here are the times it takes for different-sized water heaters:
| Water Heater Size (Gallons) | Estimated Drain Time (Minutes) |
|---|---|
| 30 Gallons | 5 – 10 |
| 40 Gallons | 10 – 15 |
| 50 Gallons | 12 – 17 |
| 60 Gallons | 15 – 20 |
| 75 Gallons | 20 – 25 |
| 80 Gallons | 20 – 30 |
| 100 Gallons | 25 – 35 |
Monitor the draining process closely. If water flow diminishes prematurely, sediment might have clogged the valve—use a coat hanger to dislodge obstructions. Once water ceases, flush the tank by reopening the cold water supply for a few minutes, facilitating sediment removal.
Close the drain valve, detach the hose, and shut the pressure relief valve. Refill the tank by reopening the cold water supply, then restore power or relight the pilot. Verify the system’s operational status post-refill.
Should You Drain Your Water Heater?
You need to assess whether a professional plumber or a DIY approach best suits your situation. If significant sediment accumulation has already compromised efficiency, it might be too late for a simple drain. Ignoring regular drainage can lead to problems like reduced heating efficiency and potential tank damage.
Professional Vs. DIY
Deciding whether to drain your water heater yourself or hire a professional boils down to evaluating your technical proficiency and understanding of the system’s intricacies. DIY enthusiasts might relish the challenge, but professional plumbing guarantees thorough service, minimizing potential pitfalls.
DIY Approach:
- Skill Level: You need a solid grasp of plumbing systems, including the shut-off valve, pressure relief valve, and drain valve.
- Tools: Essential equipment includes a garden hose, bucket, pipe wrench, and possibly a pump.
- Time Commitment: Allocating a few hours for the task, including setup, draining, and cleanup, is necessary.
- Risk Management: Potential for scalding, water damage, or improper reassembly exists if not executed correctly.
- Cost Efficiency: DIY can save on labor costs but might incur expenses for tools and potential repairs.
Professional Service:
- Expertise: Licensed technicians bring specialized knowledge, guaranteeing thorough and safe procedures.
- Equipment: Professionals utilize advanced tools and techniques, such as sediment removal systems and diagnostic instruments.
- Time Savings: Professionals typically complete the task faster and more efficiently.
- Risk Mitigation: Reduced risk of errors, leaks, or damage, guaranteeing the longevity of your heater.
- Thorough Maintenance: They often provide additional services like inspections and minor repairs, enhancing overall performance.
Is It Too Late to Drain Your Water Heater?
Most water heaters last 8-12 years. If you’re observing signs of your water heater being damaged or old, such as water leaks or strange noises, it may be too late to drain your water heater. However, speak with a professional plumber to assess any possible damage.
How Often do Water Heaters Need to be Drained?
Regular maintenance of your water heater, including periodic draining, is essential for ensuring its longevity and efficiency. Drain your water heater every 12 months to prevent sediment buildup and corrosion. Key benefits include:
- Enhanced energy efficiency
- Prolonged operational lifespan
- Reduced risk of system failures
- Improved heating performance
- Minimized water contamination
Don’t overlook this simple yet vital maintenance task.
Problems Arising from Not Draining Your Water Heater
Failing to drain your water heater can precipitate a cascade of technical issues that compromise its efficiency and longevity. Sediment accumulation is the primary culprit. Minerals like calcium carbonate settle at the bottom, forming a layer that insulates the heating element from water. This causes the heater to work harder, increasing energy consumption and operational costs. Over time, this buildup can induce corrosion, leading to leaks in the tank.
Moreover, sediment can clog the drain valve, making future maintenance more challenging. The sediment layer also reduces the tank’s effective capacity, meaning you’ll experience less hot water. In extreme cases, excessive sediment can cause the tank to overheat and potentially rupture, posing safety risks.
Additionally, sediment can affect the anode rod, a critical component in preventing tank corrosion. When sediment surrounds the anode rod, it hinders its ability to protect the tank, accelerating internal rust. This degradation can result in premature tank failure, necessitating costly replacements.
Thus, neglecting to drain your water heater not only diminishes performance but also shortens its lifespan, leading to increased maintenance expenses and potential safety hazards. Regular draining is essential for peak operation and durability.
Draining Other Types of Water Heaters
Other types of systems include electric and tankless water heaters. Both types require adherence to manufacturer guidelines for peak performance and safety.
Electric Water Heaters
Before you begin draining an electric water heater, verify that the power supply is completely disconnected to prevent electric shock. Locate your circuit breaker panel and switch off the breaker linked to your water heater. Confirm the deactivation using a non-contact voltage tester.
Next, follow these steps to guarantee a smooth drainage process:
- Pressure Relief Valve: Open the pressure relief valve to mitigate internal pressure.
- Cold Water Supply Valve: Close the cold water supply valve to cease incoming water flow.
- Drain Valve Attachment: Attach a garden hose to the drain valve, directing the other end to a suitable drainage area.
- Opening Faucets: Open a hot water faucet to facilitate air entry, allowing faster drainage.
- Drain Valve Operation: Open the drain valve to commence water egress.
Once the water heater is fully drained, inspect the tank for sediment accumulation. Sediment buildup can greatly impair heating efficiency and should be flushed out thoroughly.
Tankless Water Heaters
Draining a tankless water heater, often referred to as an on-demand water heater, involves a meticulous process to guarantee longevity and efficiency. Begin by powering down the unit either by switching off the circuit breaker for electric models or setting the gas valve to the off position for gas models. Disconnect the water supply by closing the cold water inlet valve and the hot water outlet valve.
Attach a hose to the service port valves, often denoted as isolation valves, and direct the other end to a drainage area. Open the service port valves to allow the water to flow out. It’s vital to use a descaling solution, such as white vinegar or a commercially available descaler, to flush the system and remove mineral buildup.
Utilize a submersible pump to circulate the descaling solution through the heater for approximately 45 minutes. Afterward, close the service port valves, remove the hoses, and reopen the cold water inlet and hot water outlet valves. Power the unit back on and check for leaks or irregularities. Properly draining and descaling guarantees peak performance and extends the lifespan of your tankless water heater.
Conclusion
Regularly draining your water heater is essential for maintaining operational efficiency and prolonging its lifespan. By following the outlined steps—disconnecting the power supply, closing the cold water valve, attaching a garden hose to the drain valve, and flushing the tank—you’ll mitigate sediment buildup and enhance performance. Whether opting for DIY maintenance or hiring professionals, staying proactive prevents complications. Remember, neglecting this maintenance can lead to decreased efficiency and potential system failures. Prioritize regular drainage for peak function.