Freezing Tankless Water Heaters: A Wintertime Hazard You Can Avoid

Tankless water heaters are becoming increasingly popular due to their energy efficiency and space-saving design. However, with the arrival of winter, homeowners may wonder if their tankless water heater is vulnerable to freezing. In this comprehensive guide, we will explore the answer to the question “can tankless water heater freeze” and provide detailed instructions on how to prevent it from happening.

Understanding Tankless Water Heaters

Tankless water heaters operate differently from traditional tank-style water heaters. Traditional water heaters store a reserve of hot water in a tank, while tankless water heaters heat water on demand as it flows through the unit. This eliminates the need for a large storage tank, making them a more compact and energy-efficient option.

Can Tankless Water Heaters Freeze?

Yes, tankless water heaters can freeze if they are not properly winterized. When the outdoor temperature drops below freezing, the water inside the water heater and its pipes can freeze, causing damage to the unit and potentially bursting the pipes.

Factors Contributing to Freezing

Several factors can contribute to the freezing of tankless water heaters, including:

• Outdoor Temperature: When the outdoor temperature falls below freezing for an extended period, the water in the water heater and its pipes can freeze.
• Wind Chill: Wind chill can lower the effective temperature even further, increasing the risk of freezing.
• Poor Insulation: If the water heater and its pipes are not adequately insulated, they are more susceptible to freezing.
• Power Outages: If the power goes out during freezing temperatures, the water heater will not be able to maintain its temperature, increasing the risk of freezing.

How to Prevent Tankless Water Heater Freezing

To prevent your tankless water heater from freezing, it is crucial to take the following steps:

1. Insulate: Insulate the water heater and its pipes with foam insulation or fiberglass wrap.
2. Drain: Drain the water from the water heater and its pipes if you will be away for an extended period or if freezing temperatures are expected.
3. Use Antifreeze: Add a non-toxic antifreeze solution to the water heater to prevent freezing.
4. Install a Freeze Protection Kit: Some tankless water heaters come with built-in freeze protection kits. If yours does not, you can purchase and install one.
5. Set a Winter Temperature: Adjust the temperature setting on your water heater to a higher level during winter months to prevent freezing.
6. Keep the Area Warm: Keep the area around the water heater warm by closing windows and doors and using space heaters or other heating devices.

Impact of Freezing on Tankless Water Heaters

If a tankless water heater freezes, it can cause significant damage, including:

• Cracked Heat Exchanger: The heat exchanger is the component that heats the water. Freezing can cause it to crack, leading to leaks and reduced efficiency.
• Bursting Pipes: The frozen water can expand and burst the pipes connected to the water heater, causing flooding and water damage.
• Electrical Damage: Freezing can also damage the electrical components of the water heater, rendering it inoperable.

Repairing a Frozen Tankless Water Heater

If your tankless water heater has frozen, it is important to act quickly to prevent further damage:

1. Turn Off the Power: Immediately turn off the power to the water heater at the circuit breaker or fuse box.
2. Thaw the Water: Use a heat gun or hair dryer to thaw the frozen water in the water heater and pipes. Do not use open flames or heat sources that could cause a fire.
3. Inspect for Damage: Once the water has thawed, inspect the water heater and pipes for any cracks or leaks.
4. Repair or Replace: If there is significant damage, it may be necessary to repair or replace the water heater.

FAQs

Q: Can I just leave my tankless water heater on during the winter to prevent freezing?
A: No, it is not recommended to leave your tankless water heater on continuously during the winter. This can lead to increased energy consumption and wear and tear on the unit.

Q: How often should I drain my tankless water heater during the winter?
A: It is recommended to drain your tankless water heater monthly during freezing temperatures to prevent freezing.

Q: Can I use antifreeze in my tankless water heater?
A: Yes, you can use a non-toxic antifreeze solution in your tankless water heater to prevent freezing. Follow the manufacturer’s instructions carefully when using antifreeze.