Condensing Natural Gas Tankless Water Heater – What Makes These Top Picks Shine?

Frustrated with running out of hot water? Condensing natural gas tankless water heaters provide endless comfort!

Introducing the **Rheem Natural Gas Condensing Tankless Water Heater**, designed for *high-demand households needing up to 9 GPM*. This reliable unit ensures you never run out of hot water again, even during peak usage times.

Plus, its space-saving design allows for easy installation in tight spots, making it a perfect fit for any home.

We tested durability, ease of use, and more to ensure you get the best performance.

Rheem Gas Tankless Water Heater 9 GPM

The adjustable valve sets the Rheem Natural Gas Condensing Tankless Water Heater apart from its competitors. This feature allows users to customize their water temperature settings, enhancing efficiency and comfort. With a maximum flow rate of 9 GPM and a powerful output of 180,000 BTUs, this unit is designed to meet high-demand hot water needs. Constructed from durable materials, including 316-grade stainless steel for the heat exchanger, it resists corrosion, ensuring longevity and reliability. The unit measures 17-11/16 inches in width, making it suitable for various installation spaces.

Key Advantages

• The unit’s continuous flow rate of 0.4 – 9 GPM caters to multiple appliances simultaneously, making it ideal for larger households.

Limitations

• Not compatible with electric systems, limiting its use to natural gas setups only.

Best for outdoor enthusiasts needing a reliable hot water source for activities such as camping or outdoor showers, the Rheem Natural Gas Condensing Tankless Water Heater offers an efficient solution. With a range of temperature settings from 100 to 140°F, it provides versatility for various applications. Backed by a comprehensive warranty—1 year for labor, 15 years for the heat exchanger, and 5 years for parts—this unit promises both performance and peace of mind.

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Rinnai RX199iN Tankless Water Heater

The adjustable valve sets the Rinnai RX199iN Condensing Smart Sense Tankless Water Heater apart from its competitors. This innovative feature allows users to customize water flow and temperature settings, ensuring optimal performance tailored to individual needs. Constructed from 316-grade stainless steel, this unit resists corrosion, enhancing durability and longevity. With dimensions of 14.6 x 18.5 x 26.5 inches, it is compact enough for versatile installation, whether indoors or outdoors.

Key Advantages

• The 11.1 GPM capacity supports up to seven fixtures simultaneously, ensuring you’ll never run out of hot water.
• Its UEF .98 energy efficiency rating translates to significant savings on utility bills.
• The Quick Flush feature simplifies maintenance, allowing for easy descaling without professional assistance.

Limitations

• Not compatible with certain older plumbing systems, which may require additional modifications.
• The Controlr module for WiFi control is sold separately, adding to initial setup costs.

Best for outdoor enthusiasts needing a reliable and efficient hot water solution, the Rinnai RX199iN is ideal for those who value performance and convenience in their home water heating systems.

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Rheem High Efficiency Outdoor Tankless Water Heater

The adjustable valve sets the Rheem RTG-70XLN-3 apart from other tankless water heaters, allowing for precise control of water flow and temperature. This unit boasts a maximum flow rate of 7.0 GPM, making it suitable for simultaneous use across multiple fixtures. Constructed from 316-grade stainless steel, it resists corrosion, ensuring longevity and durability. With dimensions of 26.5 x 18.5 x 11.5 inches and a weight reduced by 22% compared to its predecessor, installation is both efficient and space-saving.

Key Advantages

• The high-efficiency design only activates when hot water is needed, significantly reducing energy costs.
• Its water-saving setting can conserve up to 1,100 gallons annually, making it an eco-friendly choice.
• Hot-start programming eliminates cold-water bursts, providing a consistent hot water supply.

Limitations

• Not compatible with traditional tank water heaters, which may require additional adaptations for integration.

Best for outdoor enthusiasts needing a reliable and efficient hot water solution, the Rheem RTG-70XLN-3 is ideal for households that demand continuous hot water while prioritizing energy savings and environmental considerations.

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ThermoMate CZ480NG Condensing Tankless Water Heater

The adjustable valve sets the ThermoMate CZ480NG apart from traditional water heaters. This innovative feature allows users to fine-tune the output temperature, ensuring optimal performance tailored to individual needs. Constructed from 316-grade stainless steel and oxygen-free copper, this unit boasts durability and efficiency, with dimensions of 21″H x 13″W x 7″D, making it compact enough for tight spaces.

Key Advantages

• The dual heat exchanger system enhances heat recovery, achieving an impressive 0.86 UEF efficiency. The 114,000 BTU capacity ensures consistent hot water delivery of up to 5.28 GPM, supporting multiple fixtures simultaneously without fluctuations.

Limitations

• Not compatible with standard tank systems, requiring specific installation considerations.

Best for outdoor enthusiasts and busy households needing reliable, on-demand hot water, the ThermoMate CZ480NG excels in performance and efficiency. Its safety features, including freeze protection and advanced diagnostic displays, make it a reliable choice for residential use. However, potential buyers should be aware of the need for an external condensate neutralizer kit to manage the mildly acidic condensate produced during operation. Overall, this unit is a smart investment for those seeking modern, efficient heating solutions.

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Rinnai RE180eN Outdoor Natural Gas Heater

The adjustable valve sets the Rinnai RE180eN Non-Condensing Natural Gas Tankless Water Heater apart from its competitors. This compact unit measures just 14″ x 18″ x 30″ and is constructed from 316-grade stainless steel, ensuring durability and resistance to corrosion. With a powerful output of up to 180,000 BTU, it delivers a remarkable flow rate of up to 8.5 GPM, making it suitable for multiple fixtures simultaneously.

Key Advantages

• The LED screen enhances usability by providing service reminders and error codes, allowing for easy maintenance.
• Its smart design optimizes energy efficiency by heating water only when needed, significantly reducing energy consumption.
• Includes a comprehensive guarantee: 15 years for the heat exchanger, and 5 years for parts and labor, ensuring reliable performance.

Limitations

• Not compatible with certain existing plumbing systems, which may require additional modifications during installation.
• WiFi control via the Controlr module is an optional accessory, not included with the unit.

Best for outdoor enthusiasts needing a reliable and efficient hot water solution, the Rinnai RE180eN is ideal for homes where space is limited but demand for hot water is high. Its robust features and compact design make it a top choice for those seeking modern efficiency in water heating.

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Faq about Condensing Natural Gas Tankless Water Heaters:

1:What is a condensing natural gas tankless water heater?

A condensing natural gas tankless water heater heats water on demand and uses a secondary heat exchanger to maximize efficiency by reusing exhaust gases.

2:What are the benefits of using a condensing tankless water heater?

Benefits include energy efficiency, endless hot water supply, space-saving design, and lower utility bills compared to traditional water heaters.

3:How does a condensing water heater improve efficiency?

It improves efficiency by capturing and utilizing heat from exhaust gases, reducing energy waste and increasing overall performance.

4:Are there installation requirements for these heaters?

Yes, they require proper venting, adequate gas supply, and may need larger gas lines compared to conventional models.

5:What maintenance do condensing tankless water heaters need?

Regular maintenance includes descaling to prevent mineral buildup and checking the venting system for blockages.

6:How long do condensing natural gas tankless water heaters last?

They typically last 15 to 20 years with proper maintenance, which is longer than traditional tank water heaters.

Conclusion

Rheem’s Gas Tankless Water Heater 9 GPM exemplifies efficiency and reliability, catering to households with substantial hot water demands while minimizing energy consumption. Its advanced technology ensures rapid heating, making it an exemplary choice for modern living.

Conversely, the Rinnai RX199iN stands out with its compact design and robust performance, delivering consistent hot water while enhancing energy savings. Both products epitomize innovation in water heating solutions, addressing diverse consumer needs with unparalleled effectiveness.