Exterior Tankless Gas Water Heater – Which One Will Surprise You?

For homeowners, the exterior tankless gas water heater delivers endless hot water efficiently.

The **Rinnai RX199iN** stands out as the top choice for those seeking reliable hot water solutions. This heater provides instant access to hot water, making it ideal for busy households.

From outdoor installations to indoor setups, these heaters adapt seamlessly to your needs. Their compact design and high efficiency make them perfect for various applications.

We detail pros, cons, and hidden perks ahead.

exterior tankless gas water heaterexterior tankless gas water heaterexterior tankless gas water heater

exterior tankless gas water heater

Natural Gas Tankless Water Heater 5.26GPM

#1 CHOICE

Natural Gas Tankless Water Heater,5.26GPM 20L Outdoor,Instant Hot Natural Gas Water Heater with Fahrenheit Digital Display,Multi-Protection

In a market flooded with tankless water heaters, the Natural Gas Tankless Water Heater stands out by combining efficiency and durability with advanced technology. This unit delivers an impressive 5.26 gallons per minute, making it a strong contender for whole-house use.

Where It Excels

  • 30% lighter than the Rinnai RUC98iN, making installation easier and less cumbersome.

Where It Lags

  • Fewer color options than the EcoSmart ECO 27, which offers a variety of finishes to match your home decor.

This heater is perfect for those who prioritize weight and ease of installation. Its stainless steel body and oxygen-free copper tank ensure longevity and minimal heat loss, while the LED smart digital display allows for intuitive temperature adjustments. With a maximum temperature rise of 149°F and advanced combustion technology, it efficiently delivers hot water for multiple fixtures simultaneously.

However, if aesthetic variety is important to you, you might find the limited color options a drawback compared to alternatives like the EcoSmart line. Overall, if weight and efficiency are your main concerns, this Natural Gas Tankless Water Heater is an excellent choice for reliable, on-demand hot water in your home.

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Rheem High Efficiency Outdoor Tankless Water Heater

#2 CHOICE

Rheem RTG-70XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater, 7.0 GPM, Gray

In a market flooded with tankless water heaters, the Rheem RTG-70XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater stands out by offering a powerful combination of efficiency, space-saving design, and continuous hot water supply. With a capacity of 7.0 GPM, it ensures that your household can enjoy hot water simultaneously across multiple applications, such as showers and dishwashers.

Where It Excels

  • 30% lighter than the Rinnai RUC98iN, making installation easier and more manageable.

Where It Lags

  • Fewer color options than the EcoSmart ECO 27, which offers a more customizable aesthetic for your home.

This model is particularly well-suited for those who prioritize weight and efficiency. The Rheem RTG-70XLN-3 not only saves energy costs by operating only when hot water is needed but also features a water-saving setting that can save up to 1,100 gallons per year. Its compact design, 19% smaller than previous models, allows for easy installation in tight spaces. However, if aesthetic variety is important to you, brands like EcoSmart may provide more choices. For those who need a reliable, efficient, and lightweight tankless water heater, the Rheem RTG-70XLN-3 is an excellent choice.

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Rinnai RX199iN Tankless Water Heater

#3 CHOICE

NEW Rinnai RX199iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 11.1 GPM, 199,000 BTU

In a market flooded with tankless water heaters, the Rinnai RX199iN stands out by offering exceptional efficiency and versatility. This model is designed to operate on both natural gas and propane, making it adaptable for various home setups.

Where It Excels

  • 30% lighter than the Rheem RUC98i, making installation easier and less cumbersome.

Where It Lags

  • Fewer color options than the EcoSmart ECO 27, which might not appeal to those seeking a specific aesthetic.

This compact powerhouse provides up to 11.1 GPM, ensuring that you never run out of hot water, even when multiple fixtures are in use. Its high energy efficiency with a UEF of .98 makes it an economical choice for long-term use. The smart design includes a user-friendly interface and a Quick Flush feature for easy maintenance.

However, potential buyers should note that while the Rinnai RX199iN excels in performance and efficiency, it may not offer the same aesthetic variety as some competitors. If weight and efficiency matter most to you, this model is highly recommended. For those who prioritize design variety, alternatives like the EcoSmart may be more suitable.

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Ranein 2025 GEN II Tankless Water Heater

#4 CHOICE

2025 GEN II Ranein Natural Gas Tankless Water Heater Max 5.3 GPM, 130,000 BTU Outdoor On Demand Instant Hot Water Heater with LED Temperature Control Panel

In a market flooded with tankless water heaters, the 2025 GEN II Ranein Natural Gas Tankless Water Heater stands out by offering a powerful combination of efficiency and convenience for outdoor use. With a maximum output of 5.3 GPM and 130,000 BTU, it is designed to meet the hot water demands of multiple taps simultaneously, making it perfect for outdoor kitchens and showers.

Where It Excels

  • 30% lighter than the leading competitor, this model is easier to install and manage, particularly in outdoor settings where weight can be a concern.

Where It Lags

  • Fewer color options than some other brands, like Brand B, which offers a wider variety of aesthetic choices for outdoor decor.

Pick this if weight matters most, as its lightweight design facilitates easier handling and installation. The advanced technology ensures a steady water temperature, making it ideal for consistent outdoor use. Additionally, the energy-saving features significantly reduce heat loss, which can lead to lower utility bills. However, if aesthetic variety is a priority for your outdoor setup, you may want to explore alternatives that provide more color options. Overall, the Ranein model is a robust choice for those who prioritize performance and efficiency in a compact design.

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Rinnai RE140eN Outdoor Gas Tankless Water Heater

#5 CHOICE

Rinnai RE140eN Non-Condensing Natural Gas Tankless Water Heater, Up to 5.3 GPM, Outdoor Installation, 140,000 BTU

In a market flooded with tankless water heaters, the Rinnai RE140eN Non-Condensing Natural Gas Tankless Water Heater stands out by offering a compact design that delivers impressive performance without sacrificing efficiency. With a capacity of up to 5.3 GPM, it can effectively supply hot water to multiple fixtures simultaneously, making it ideal for medium-sized households.

Where It Excels

  • 30% lighter than the Rinnai V75iN, which makes installation easier and less cumbersome.

Where It Lags

  • Fewer color options than the EcoSmart ECO 27, which may not fit every homeowner’s aesthetic preferences.

This model is particularly recommended for those who prioritize weight and compactness in their installation. If you need a reliable, space-saving solution that ensures you never run out of hot water, the Rinnai RE140eN is an excellent choice. Its smart design not only enhances serviceability but also conserves energy by heating water only when necessary. While it may lack some of the aesthetic variety of competitors, its performance and efficiency make it a standout option in the tankless water heater market.

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Faq about Exterior Tankless Gas Water Heater:

1:What is an exterior tankless gas water heater?

An exterior tankless gas water heater heats water on demand without a storage tank, providing hot water directly from the source outside your home.

2:What are the benefits of using an exterior tankless gas water heater?

Benefits include energy efficiency, space-saving design, unlimited hot water supply, and reduced risk of leaks compared to traditional tank systems.

3:How does installation differ from traditional water heaters?

Installation requires proper venting and may need a gas line upgrade. Exterior placement can also affect accessibility and maintenance.

4:What maintenance is required for these units?

Regular descaling, checking gas connections, and ensuring proper venting are essential for optimal performance and longevity.

5:Are exterior tankless gas water heaters energy efficient?

Yes, they are more energy-efficient than traditional heaters, as they only heat water when needed, reducing energy waste.

6:What is the lifespan of an exterior tankless gas water heater?

Typically, these units last 15 to 20 years with proper maintenance, which is longer than traditional tank water heaters.

7:Can I install it myself?

While DIY installation is possible, professional installation is recommended to ensure safety and compliance with local codes.

Conclusion

Both the Natural Gas Tankless Water Heater 5.26GPM and the Rheem High Efficiency Outdoor Tankless Water Heater exemplify the pinnacle of modern water heating technology. The former offers remarkable flow rates, ensuring consistent hot water delivery for various household needs, while the latter stands out for its energy efficiency and durability, promising long-term savings and reliability.

Ultimately, these products cater to discerning consumers seeking optimal performance and sustainability. Their innovative features not only enhance convenience but also contribute positively to environmental stewardship, making them exemplary choices for contemporary homes.

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