Choosing the Right Pipes for Your Tankless Water Heater

To ensure the efficiency and longevity of your tankless water heater, selecting the appropriate pipes is crucial. In this article, we will discuss the different types of pipes that can be used with a tankless water heater, the considerations involved, and the necessary components such as valves and flues. We will also explore the specific requirements for both gas and electric tankless water heaters.

Common Types of Pipes Suitable for Tankless Water Heaters

When installing a tankless water heater, the types of pipes you can use typically include:

Copper Pipes

Strength: Durable and resistant to corrosion Heat Conductivity: Good heat conductivity Applications: Typically used for both hot and cold water lines

PEX Cross-Linked Polyethylene Pipes

Flexibility: Flexible and easy to install Resistance: Resistant to freezing and bursting Usage: Suitable for both hot and cold water

CPVC Chlorinated Polyvinyl Chloride Pipes

Durability: Rigid and durable Temperature: Suitable for hot water applications Protection: Resistant to corrosion and scale buildup

PVC Polyvinyl Chloride Pipes

Usage: Generally used for cold water and drainage Limitations: Not suitable for hot water applications due to heat sensitivity

Stainless Steel Pipes

Corrosion Resistance: Highly resistant to corrosion and scaling Compatibility: Can be used for both hot and cold water systems

Considerations for Pipe Selection

When selecting pipes for your tankless water heater, consider the following points:

Compatibility

Ensure that the pipes are compatible with the specifications of your tankless water heater.

Temperature Ratings

Check the temperature ratings of the pipes, especially for hot water applications.

Local Codes

Adhere to local plumbing codes and regulations regarding pipe materials and installation methods.

Additional Components: Tanks and Flues

For a standard tankless water heater with 80 to 85 percent efficiency, a flue system is required to ensure safety.

Requirements: Double-walled and made of stainless steel to withstand corrosive acid fumes. Cost: The flue system can be quite costly, often as expensive as the heater itself. Efficiency: For high-efficiency tankless heaters with 95 percent or more efficiency, a condensing system can significantly reduce the cost.

If the tankless water heater is gas-powered, a gas line and a flue are necessary. However, if it is electric, no gas line or flue is required.

A valve is added for flushing purposes, which enhances the plumber's friendliness of the tankless water heater system.

Conclusion

The choice of pipes and additional components can significantly impact the performance and cost of your tankless water heater installation. By carefully considering the type of pipes and adhering to local regulations, you can ensure a reliable and energy-efficient system.

Key Takeaways

Use durable pipes that match the system's temperature ratings and local regulations. Consider the added costs of flue systems for gas-powered tankless heaters. Evaluate the efficiency of the unit and the associated costs to make an informed decision.