Natural Gas Tankless Boiler – Which 5 Will Transform Your Home Heating?

For homeowners, a natural gas tankless boiler provides endless hot water without the bulk of traditional systems.

A natural gas tankless boiler efficiently heats water on demand, making it an essential appliance for modern homes. The NEW Rinnai RXP199iN stands out as a top choice for those seeking reliability and performance.

From compact installations to high-capacity needs, these boilers adapt seamlessly to various setups, ensuring you enjoy hot water wherever you need it.

We detail pros, cons, and hidden perks ahead.

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natural gas tankless boiler

Rinnai RXP199iN Tankless Water Heater

#1 CHOICE

NEW Rinnai RXP199iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 11.1 GPM, 199,000 BTU

Rinnai RXP199iN Condensing Smart Sense Tankless Water Heater: 12” long, ABS plastic, 2-year warranty.

Benefits

  • Provides up to 11.1 GPM, accommodating 7 fixtures simultaneously without running out of hot water.

Drawbacks

  • Requires professional installation, which may add to initial costs.

The Rinnai RXP199iN is a compact and efficient tankless water heater that works with both natural gas and propane. Its size, comparable to a small suitcase, makes it ideal for homes with limited space. With a maximum output of 11.1 gallons per minute, it ensures that multiple hot water demands can be met at once, making it suitable for larger households or simultaneous usage scenarios.

One standout feature is the Smart-Circ Intelligent Recirculation system, which learns your hot water usage patterns, optimizing efficiency and convenience. The modern interface and Quick Flush feature simplify maintenance, while the energy efficiency rating of UEF .98 indicates substantial savings on utility bills.

However, potential buyers should be aware that the Rinnai RXP199iN requires professional installation, which can increase the overall cost. Additionally, it does not come with WiFi control capabilities out of the box, as the Controlr module is sold separately.

This product is a practical pick for small spaces, offering an efficient and reliable solution for endless hot water needs.

To buy this product, click here.

Rinnai i060CN Condensing Gas Boiler

#2 CHOICE

Rinnai i060CN Condensing Gas Boiler, Whole Home Heating and Water Natural Gas Heater with Space-Saving Design and Smart Features, (60K BTU)

Rinnai i060CN Condensing Gas Boiler: 12” long, ABS plastic, 2-year warranty.

Benefits

  • Holds 5L without tipping.
  • High efficiency with a 60K BTU output.
  • Smart features including multizone control capability.
  • Easy-to-read digital display for temperature and pressure.
  • Adjustable CH temperature between 104°F and 180°F.
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Drawbacks

  • No dishwasher-safe parts.
  • Professional installation recommended.
  • Wall mount design may require additional space considerations.

The Rinnai i060CN is an excellent choice for those seeking an efficient and compact heating solution. Its ability to heat an entire home while providing hot water makes it versatile. The multizone control allows for customized heating, enhancing comfort and energy savings. The digital interface is user-friendly, making it easy to adjust settings as needed.

However, potential buyers should note that there are no dishwasher-safe parts, which could complicate maintenance. Additionally, the need for professional installation might be a drawback for DIY enthusiasts.

This boiler is a practical pick for small spaces, delivering reliable performance without taking up excessive room. It’s ideal for homeowners looking to maximize efficiency in their heating systems.

To buy this product, click here.

Rheem High Efficiency Indoor Tankless Water Heater

#3 CHOICE

Rheem RTG-95DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater, 9.5 GPM

Rheem RTG-95DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater: 9.5 GPM, natural gas, 12” long, high-efficiency, 2-year warranty.

Benefits

  • Provides continuous hot water for entire home, even with multiple applications running.
  • Energy-efficient operation saves on energy costs by only running when needed.
  • Water-saving setting can save up to 1,100 gallons of water per year.
  • Hot-start programming eliminates cold-water bursts, ensuring a consistent hot water supply.
  • LeakGuard technology detects and prevents leaks, protecting your home from water damage.

Drawbacks

  • Noisy operation during high demand may be noticeable in quiet environments.
  • No built-in recirculation system, which may require additional installation for instant hot water.

A practical pick for large households needing reliable hot water without the hassle of a traditional tank. Ideal for those looking to save energy and water while maintaining comfort.

To buy this product, click here.

Ranein 2025 GEN II Tankless Water Heater

#4 CHOICE

2025 GEN II Ranein Natural Gas Tankless Water Heater Max 8.5 GPM, 190,000 BTU Indoor On Demand Instant Hot Water Heater with LED Temperature Control Panel

2025 GEN II Ranein Natural Gas Tankless Water Heater: 8.5 GPM max flow, stainless steel body, 190,000 BTU output, 2-year warranty.

Benefits

  • Supports multiple taps: Efficiently handles 4-6 outlets simultaneously, making it ideal for larger households.

Drawbacks

  • Requires professional installation: Must be installed by licensed professionals, which can add to the overall cost.
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The 2025 GEN II Ranein is a powerful and efficient water heater designed for modern living. With a maximum flow rate of 8.5 GPM and a robust 190,000 BTU output, it ensures a steady supply of hot water for your daily needs. The advanced technology maintains a consistent temperature, eliminating sudden changes during showers or while using multiple taps.
Its compact, wall-mounted design makes it perfect for small spaces, freeing up valuable floor area in apartments or homes. The stainless steel construction enhances durability and resists corrosion, while the oxygen-free copper tank minimizes heat loss, ensuring energy efficiency. This unit heats water on demand, significantly reducing energy costs compared to traditional tank heaters.
However, the requirement for professional installation may deter some users, as it entails additional expenses. Also, the unit is not suitable for elevations over 2,000 feet.
Overall, the 2025 GEN II Ranein is a practical pick for those seeking a reliable and space-saving hot water solution.

To buy this product, click here.

Natural Gas Tankless Water Heater 14L

#5 CHOICE

Natural Gas Tankless Water Heater, 14L Instant Hot Water Heater with Fahrenheit Digital Display, Indoor Installation Up to 3.7GPM, 95540BTU

Natural Gas Tankless Water Heater: 14L capacity, industrial-grade materials, 2-year warranty.

Benefits

  • Delivers 14L/min (3.7GPM) flow rate for instant hot water, ideal for multiple fixtures.

Drawbacks

  • Professional installation required; improper setup can lead to safety hazards.

This natural gas tankless water heater is engineered for efficiency and reliability. With a powerful 95,540BTU output, it provides hot water on demand without the wait associated with traditional storage heaters. The dual Fahrenheit/Celsius digital display is user-friendly, allowing you to monitor and adjust temperatures easily, while the automatic overheat protection ensures safety, especially in homes with children.

Constructed from high-quality metal and UL-certified stainless steel, this unit is built to withstand indoor humidity and resist rust, ensuring longevity. The compact design is perfect for small spaces, making it a practical choice for apartments or homes with limited room for bulky water tanks.

However, it’s important to note that this heater requires professional installation due to its complex gas piping and venting needs. This could be a drawback for DIY enthusiasts. Nonetheless, for those seeking a reliable source of hot water without the hassle of preheating, this tankless water heater is an excellent investment. Ideal for users who prioritize efficiency and safety in small living environments.

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To buy this product, click here.

Faq about Natural Gas Tankless Boiler:

1:What is a natural gas tankless boiler?

A natural gas tankless boiler heats water on demand without a storage tank, providing hot water only when needed.

2:How does a natural gas tankless boiler work?

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

3:What are the benefits of using a natural gas tankless boiler?

Benefits include energy efficiency, continuous hot water supply, and reduced space requirements compared to traditional boilers.

4:Are there any downsides to natural gas tankless boilers?

Initial installation costs can be higher, and they may require upgrades to gas lines or venting systems.

5:How do I maintain a natural gas tankless boiler?

Regular maintenance includes descaling to prevent mineral buildup and checking filters and vents for blockages.

6:What size natural gas tankless boiler do I need?

Size depends on your hot water demand; consider the number of fixtures and peak usage times for proper sizing.

7:Can I install a natural gas tankless boiler myself?

It is recommended to hire a professional for installation to ensure safety and compliance with local codes.

Conclusion

Both the Rinnai RXP199iN Tankless Water Heater and Rinnai i060CN Condensing Gas Boiler epitomize efficiency and innovation in modern heating solutions. The RXP199iN excels in delivering instantaneous hot water, ensuring optimal comfort while conserving energy, making it a quintessential choice for residential applications.

Conversely, the i060CN stands out for its remarkable condensing technology, which maximizes fuel utilization and minimizes emissions, thereby promoting environmental sustainability. Together, these products represent a harmonious blend of performance and eco-friendliness, catering to diverse heating needs with unmatched reliability.