Exterior Tankless Hot Water Heater – Are These the Game Changers You Need?

Feeling frustrated with inconsistent hot water? The exterior tankless hot water heater delivers instant comfort.

The **Rinnai RX199iN** is perfect for *high-demand households*, providing up to 11.1 GPM of hot water on demand.

Plus, its smart technology ensures efficient energy use, saving you money on bills.

We tested durability, ease of use, and more to ensure you get a reliable hot water solution.

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exterior tankless hot water heater

Rinnai RX199iN Tankless Water Heater

#1 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

The adjustable valve sets the Rinnai RX199iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater apart from its competitors. This advanced feature allows users to customize the water flow and temperature settings to meet their specific needs. The unit is compact, measuring just 14.6 x 26.5 x 11.5 inches, and constructed from 316-grade stainless steel, ensuring high resistance to corrosion and durability.

Key Advantages

  • The unit delivers an impressive maximum flow rate of up to 11.1 GPM, accommodating multiple fixtures simultaneously, making it ideal for larger households.
  • Its energy efficiency is remarkable, boasting a UEF of .98, which translates to significant savings on utility bills.
  • Equipped with a Quick Flush feature, maintenance is simplified, ensuring optimal performance over time.

Limitations

  • The Rinnai RX199iN is not compatible with certain older plumbing systems, which may require additional modifications for installation.
  • Professional installation is recommended, as DIY setups can lead to performance issues.

Best for outdoor enthusiasts needing a reliable and efficient hot water solution, the Rinnai RX199iN is an excellent choice for those looking to enhance their water heating system while enjoying the benefits of modern technology.

To buy this product, click here.

Propane Tankless Outdoor Water Heater 5.26GPM

#2 CHOICE

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

The adjustable valve sets the Propane Tankless Water Heater Outdoor apart from its competitors. This unit boasts a robust stainless steel body, measuring 22.8″ x 14.4″ x 5.9″, ensuring both durability and efficient heat retention. With a powerful output of 120,000 BTU per hour, it delivers up to 5.26 gallons of hot water per minute, making it suitable for multiple fixtures.

Key Advantages

  • The 316-grade stainless steel construction resists corrosion, enhancing longevity.
  • The oxygen-free copper water tank minimizes heat loss, contributing to energy efficiency.
  • Equipped with advanced water servo technology, it maintains temperature fluctuations within ±1℉, ensuring consistent hot water availability.

Limitations

  • Not compatible with electric systems, limiting its use to propane setups.
  • Requires a minimum water pressure of 3.6 PSI, which may not be suitable for all locations.

This tankless water heater is best for outdoor enthusiasts needing a reliable and efficient source of hot water for camping, recreational vehicles, or outdoor showers. Its combination of advanced technology and durable materials makes it an excellent choice for those seeking performance and longevity in a propane water heater.

To buy this product, click here.

Rinnai REP160eN Smart-Circ Tankless Water Heater

#3 CHOICE

Rinnai REP160eN Smart-Circ Non-Condensing Natural Gas Tankless Water Heater with Built-In Recirculation Pump, Up to 6.6 GPM, Outdoor Installation, 160,000 BTU

The Smart-Circ intelligent recirculation feature sets the Rinnai REP160eN Smart-Circ Non-Condensing Natural Gas Tankless Water Heater apart from its competitors. This innovative technology learns your water usage patterns and optimizes the recirculation schedule, ensuring you have hot water when you need it without wasting energy. Constructed from 316-grade stainless steel, this unit is built to resist corrosion, enhancing its durability. With dimensions of just 24 x 14 x 10 inches, it is compact enough for outdoor installation, while delivering an impressive output of up to 6.6 GPM (gallons per minute) to serve multiple fixtures simultaneously.

Key Advantages

  • Features a built-in recirculation pump that maximizes energy efficiency.

Limitations

  • Not compatible with traditional tank water heaters or certain plumbing systems.

This model is best suited for outdoor enthusiasts needing consistent hot water for various applications, such as camping or outdoor showers. Its compact design and advanced features make it an excellent choice for those who prioritize efficiency and convenience in their hot water solutions.

To buy this product, click here.

ORBEK 14kW Electric Tankless Water Heater

#4 CHOICE

14kW Tankless Water Heater Electric, ORBEK 240 Volt On Demand Instant Hot Water Heater, with LED Digital Display, ETL Certified, Up to 3.38 GPM for 2-3 Point of Use

The adjustable valve sets the ORBEK 14kW Tankless Water Heater apart from its competitors. This unit is constructed from durable 316-grade stainless steel, ensuring long-lasting performance and resistance to corrosion. With dimensions of 14.2″H x 9.5″L x 3.1″W, it boasts a compact design that allows for easy installation in tight spaces.

Key Advantages

  • The heater delivers an impressive 3.38 GPM of on-demand hot water, making it suitable for 2-3 points of use simultaneously.
  • Its high energy efficiency, utilizing water-electricity separation, can reduce electricity costs by up to 60% compared to traditional tank heaters.
  • Advanced safety features, including leakage protection and dry-heating protection, ensure user safety while the ETL certification adds an extra layer of reliability.
  • The built-in chip offers stable temperature control, adjusting heating power 20,000 times per second to maintain water temperature within 1°F.
  • The LED digital display provides real-time temperature adjustments between 86°F and 140°F, enhancing user convenience.

Limitations

  • Not compatible with traditional tank-style water heaters, requiring specific installation requirements such as a 240V/60AMP two-pole breaker.

This product is best for outdoor enthusiasts needing a reliable, efficient, and compact hot water solution for various applications.

To buy this product, click here.

Ranein 2025 GEN II Tankless Water Heater

#5 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

The adjustable valve sets the 2025 GEN II Ranein Natural Gas Tankless Water Heater apart from competitors, allowing users to fine-tune water flow and temperature for optimal performance. This unit is constructed from 316-grade stainless steel, ensuring durability and resistance to corrosion, while its compact dimensions make it suitable for tight outdoor spaces.

Key Advantages

  • The heater delivers a maximum output of 5.3 GPM and 130,000 BTU, efficiently servicing 3-5 taps simultaneously, making it ideal for outdoor kitchens or showers.
  • Advanced technology maintains a steady water temperature by automatically adjusting flow and heat, preventing sudden temperature fluctuations.
  • The bottom-mounted blower enhances safety by preventing smoke backflow and adjusting speed based on outdoor wind pressure, ensuring efficient gas combustion.
  • With an internal oxygen-free copper tank, this model minimizes heat loss, providing on-demand heating that significantly reduces energy costs.
  • Its wall-mounted design conserves space, fitting neatly into outdoor corners or balconies.

Limitations

  • Not compatible with electric systems or standard tank water heaters, limiting versatility in some installations.
  • Not recommended for elevations above 2,000 feet, which may restrict use in certain locations.
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This heater is best for outdoor enthusiasts needing a reliable and efficient hot water solution for various outdoor activities.

To buy this product, click here.

Faq about Exterior Tankless Hot Water Heater:

1: What is an exterior tankless hot water heater?

An exterior tankless hot water heater heats water on demand without storing it, providing continuous hot water while saving space and energy.

2: How does an exterior tankless hot water heater work?

It uses a heat exchanger to warm water as it flows through the unit, activating only when a hot water tap is opened.

3: What are the benefits of an exterior tankless hot water heater?

Benefits include energy efficiency, endless hot water supply, space savings, and longer lifespan compared to traditional water heaters.

4: How do I install an exterior tankless hot water heater?

Installation should be done by a professional to ensure proper venting, gas or electric connections, and compliance with local codes.

5: What maintenance is required for an exterior tankless hot water heater?

Regular descaling to prevent mineral buildup and annual inspections to ensure optimal performance are recommended.

6: Can I use an exterior tankless hot water heater in cold climates?

Yes, but it requires proper insulation and possibly a freeze protection system to maintain efficiency in cold weather.

Conclusion

Rinnai RX199iN exemplifies cutting-edge technology, delivering an impressive 5.26 GPM, ensuring a continuous supply of hot water while optimizing energy efficiency. Its durable construction and advanced features cater to both residential and commercial needs, making it a premier choice for discerning consumers.

Conversely, the Propane Tankless Outdoor Water Heater stands out for its portability and ease of installation, providing an efficient solution for outdoor applications. Both products epitomize innovation in hot water solutions, offering reliability and performance that address modern demands.

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