2024 Guide to Tankless Water Heaters: Everything You Need to Know

This 2024 guide to tankless water heaters provides a thorough overview of their features, installation considerations, and pros and cons.

What Is a Tankless Water Heater?

Tankless water heaters, also known as on-demand or instantaneous heaters, provide hot water as needed, without the need to store it in a tank. They are more energy-efficient than traditional storage water heaters because they only heat water when required.

How Tankless Water Heaters Work

When hot water is needed, a flow sensor detects the water flow and activates the heating mechanism. Gas-powered units ignite a burner, while electric units heat the water using copper rods. The heated water flows through the pipes to the desired faucet or appliance.

How to Select a Tankless Water Heater

Choosing the right tankless water heater depends on:

• Condensing vs. Non-condensing Technology: Condensing models offer higher energy efficiency by recycling heat from exhaust gases.
• Fuel Type: Electric models are easier to install, but gas-powered units heat water faster and can handle more appliances simultaneously.
• Size and Capacity: Proper sizing is crucial to meet household water demands. Sizing is typically based on flow rate (GPM) and temperature rise (difference between incoming and desired hot water temperature).

Tankless vs. Tank Water Heaters

Tankless heaters are more efficient and have a longer lifespan, typically 20 years compared to 10-15 years for tank water heaters. However, tankless units are more expensive to install, and the hot water flow may be limited during high demand.

Advantages and Disadvantages of Tankless Water Heaters

Pros:

• Endless hot water
• Energy-efficient
• Compact design, saving space
• Longer lifespan (15-20 years)

Cons:

• Higher initial cost
• Installation may require upgrading gas or electrical systems
• Potential delay in hot water delivery

Cost and Sizing Considerations

A typical tankless water heater costs between $1,300–$3,900, with high-end models reaching up to $6,000. Installation costs also vary, typically around $2,500. Sizing the unit correctly based on the flow rate and temperature rise is crucial to ensure efficiency.

Recommended Brands

• Rinnai: Known for both condensing and non-condensing gas models with Wi-Fi control and long lifespan.
• Bosch, Noritz, Rheem, and Takagi: All offer high-efficiency units with various features, including indoor/outdoor installation options and advanced technology.

DIY vs. Professional Installation

Due to the complexity of tankless systems, professional installation is often recommended. Installing a tankless water heater may require retrofitting existing plumbing and electrical systems, especially if replacing a traditional tank heater.

Maintenance

To ensure efficiency, maintain your tankless water heater by cleaning the exterior, descaling for hard water buildup, and flushing the system regularly.

Conclusion

Switching to a tankless water heater can offer energy savings, space efficiency, and endless hot water. While the initial cost is higher, the long-term benefits often outweigh the investment, especially for homes with high water usage. Be sure to consult with a professional to ensure proper installation and sizing.

FAQ

• Is it worth switching to a tankless water heater? Yes, for energy savings and continuous hot water.
• Can I replace my 40-gallon water heater with a tankless model? Yes, but be prepared for potential system upgrades.
• How long does a tankless water heater last? Typically 15-20 years.