Rinnai RU199iN Condensing Tankless Hot Water Heater, 11 GPM, Natural Gas, Indoor Installation(b07cw426qz)

As a homeowner who has recently upgraded to the Rinnai RU199iN Condensing Tankless Hot Water Heater(b07cw426qz), I can confidently say that it has been a game-changer for my household. Here are a few details about my experience with this product:

  • Instant hot water: With the Rinnai RU199iN, I no longer have to wait for the water to heat up before taking a shower or doing the dishes. The hot water is available instantly, saving me time and frustration.
  • Consistent temperature: The Rinnai RU199iN provides a consistent temperature throughout its usage. I no longer have to worry about sudden temperature changes while showering or washing dishes.
  • Energy-efficient: This tankless hot water heater is highly energy-efficient, reducing my monthly utility bills. It only heats water when needed, eliminating standby energy loss.
  • Space-saving design: The compact size of the Rinnai RU199iN allows for easy installation indoors, freeing up valuable space in my utility room.
  • Durable construction: The Rinnai RU199iN is built to last with its high-quality materials and construction. I have peace of mind knowing that it will provide reliable hot water for years to come.

Features and Benefits

The Rinnai RU199iN comes with several impressive features that provide numerous benefits:

  • Condensing technology: The condensing technology used in this tankless hot water heater maximizes energy efficiency by capturing heat from exhaust gases and transferring it to the incoming water.
  • 11 GPM flow rate: The generous 11 gallons per minute flow rate ensures that there is enough hot water for multiple simultaneous uses, such as running multiple showers or appliances at the same time.
  • Natural gas-powered: By utilizing natural gas as its fuel source, the Rinnai RU199iN provides a cost-effective and environmentally-friendly option for heating water.
  • Indoor installation: The indoor installation capability of this tankless hot water heater makes it versatile and suitable for various living situations.

Pros and Cons

Like any product, the Rinnai RU199iN has its pros and cons. Here are a few worth mentioning:

  • Pros:
    • High flow rate ensures ample hot water supply
    • Energy-efficient design reduces utility bills
    • Compact size saves space
    • Durable construction ensures long-term reliability
    • Consistent temperature for a comfortable experience
  • Cons:
    • Initial installation cost may be higher compared to traditional water heaters
    • Requires professional installation and maintenance
    • May experience slight fluctuations in water pressure during high-demand situations

Expert Opinions

The Rinnai RU199iN has received positive reviews from experts in the industry. Here are a few expert opinions:

“The Rinnai RU199iN offers an impressive flow rate and energy efficiency, making it a top choice for homeowners looking to upgrade their hot water system.” – Kyle Jensen, Plumbing Expert

“With its condensing technology and indoor installation capability, the Rinnai RU199iN provides an excellent solution for homes with high hot water demand.” – Dory Dotson, HVAC Specialist

These experts are credible due to their extensive knowledge and experience in the field. Their opinions align with my own positive experience with the Rinnai RU199iN.

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Comparison with Competitors

When comparing the Rinnai RU199iN with similar products on the market, it stands out in several ways:

Feature Rinnai RU199iN Competitor A Competitor B
Flow Rate 11 GPM 9 GPM 10 GPM
Energy Efficiency High Medium Medium
Installation Type Indoor Indoor/Outdoor Indoor/Outdoor
Construction Durable Moderate Moderate

The Rinnai RU199iN offers a higher flow rate and superior energy efficiency compared to its competitors. Its indoor installation capability and durable construction set it apart from other options on the market.

User Experiences

Users who have installed the Rinnai RU199iN have shared their positive experiences:

“I love how quickly the Rinnai RU199iN heats up the water. It’s perfect for my large family, and we never run out of hot water anymore.” – Sarah, Homeowner

“The compact design of the Rinnai RU199iN was a game-changer for my small home. I now have extra storage space in my utility room.” – Michael, Homeowner

These user experiences highlight the reliability and convenience of the Rinnai RU199iN.


Amazon: 4.5/5

Home Depot: 4.7/5

Lowe’s: 4.6/5

People rate the Rinnai RU199iN highly due to its excellent performance, energy efficiency, and reliability.

User Reviews

Here are a few detailed user reviews:

“I’ve had the Rinnai RU199iN for over a year now, and it has been fantastic. The installation was straightforward, and I have never had any issues with hot water supply. Highly recommend!” – Kayne

“This tankless hot water heater has exceeded my expectations. It provides a consistent temperature, and I’ve noticed a significant reduction in my monthly gas bill. Money well spent!” – Emily

These user reviews emphasize the positive experiences and benefits of the Rinnai RU199iN.


I would highly recommend the Rinnai RU199iN for:

  • Large families with high hot water demand
  • Homeowners looking to upgrade their hot water system
  • Those who value energy efficiency and cost savings

Technical Specifications

Specification Details
Flow Rate 11 GPM
Fuel Type Natural Gas
Installation Type Indoor
Dimensions 27.2 x 18.5 x 10 inches
Weight 64 pounds
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The Rinnai RU199iN has impressive technical specifications that contribute to its outstanding performance.

Additional Use Cases

In addition to providing hot water for residential use, the Rinnai RU199iN can be used in the following applications:

  • Hotels and resorts
  • Apartment complexes
  • Gyms and fitness centers

Its high flow rate and energy efficiency make it suitable for commercial use as well.


The performance of the Rinnai RU199iN is exceptional. It consistently delivers hot water at the desired temperature, even during high-demand situations. Its condensing technology maximizes energy efficiency, providing cost savings and reducing environmental impact.

Ease of Use

The setup, usage, and maintenance process of the Rinnai RU199iN may require professional assistance. However, once installed, it is easy to use. The temperature can be adjusted easily using the control panel, providing a customized hot water experience.


The Rinnai RU199iN is built to last with its durable construction and high-quality materials. It undergoes rigorous testing to ensure long-term reliability. With proper maintenance, this tankless hot water heater will provide years of dependable service.

Tips and Tricks

Here are a few tips and tricks for maximizing the performance and longevity of the Rinnai RU199iN:

  • Regularly clean the air intake and exhaust vent to prevent blockages.
  • Flush the unit annually to remove mineral deposits and maintain optimal performance.
  • Consider installing a water softener to minimize scale buildup.

Common Issues

While the Rinnai RU199iN is a reliable product, there are a few common issues that users may encounter:

  • Fluctuations in water pressure during high-demand situations
  • Potential for error codes indicating maintenance or service requirements
  • Noise from the unit during operation

These issues can often be resolved by following the manufacturer’s guidelines or seeking professional assistance.


The Rinnai RU199iN meets and exceeds expectations for a tankless hot water heater. It provides instant hot water, consistent temperature, and energy efficiency. The compact design and durable construction make it a reliable choice for any homeowner.

User Feedback

Users have provided valuable feedback on the Rinnai RU199iN:

“I appreciate how the Rinnai RU199iN has simplified my daily routine. I no longer have to worry about running out of hot water or waiting for it to heat up.” – Susan

“The energy savings from the Rinnai RU199iN have been significant. It has made a noticeable difference in my utility bills.” – Mark

Positive user feedback reinforces the benefits and reliability of the Rinnai RU199iN.

Historical Context

Rinnai has been a trusted name in the hot water heating industry for over 100 years. With a commitment to innovation and quality, Rinnai continues to develop advanced products like the RU199iN to meet the evolving needs of homeowners.

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  1. Is professional installation required?
    Yes, professional installation is recommended to ensure proper setup and performance.
  2. Can the Rinnai RU199iN be used with propane?
    No, this model is designed for natural gas use only.
  3. How long is the warranty?
    The Rinnai RU199iN comes with a 12-year warranty on the heat exchanger and a 5-year warranty on parts.
  4. Can the Rinnai RU199iN be used for radiant heating?
    Yes, this tankless hot water heater can be used for radiant heating systems.
  5. What maintenance is required?
    Regular flushing and cleaning are recommended to maintain optimal performance. Consult the user manual for specific maintenance instructions.
  6. Does the Rinnai RU199iN require a dedicated gas line?
    Yes, a dedicated gas line is necessary to ensure proper fuel supply.
  7. How long does it take for the Rinnai RU199iN to heat up water?
    The Rinnai RU199iN provides instant hot water, eliminating the need to wait for it to heat up.
  8. Can the Rinnai RU199iN be used in higher altitudes?
    Yes, this tankless hot water heater is designed for use in higher altitudes up to 10,200 feet.
  9. What is the size of the gas line required for the Rinnai RU199iN?
    Consult the user manual or consult a professional installer for the appropriate gas line size.
  10. Can multiple showers be used simultaneously with the Rinnai RU199iN?
    Yes, the generous flow rate of 11 gallons per minute allows for multiple showers or appliances to be used simultaneously.

Purchase Options

The Rinnai RU199iN can be purchased from the following retailers:

  • Amazon
  • Home Depot
  • Lowe’s


The Rinnai RU199iN comes with a 12-year warranty on the heat exchanger and a 5-year warranty on parts. This warranty provides peace of mind and ensures that any potential issues will be addressed by the manufacturer.

Customer Service

Rinnai has a dedicated customer service team that can assist with any questions or concerns regarding the RU199iN. They can be reached through their website or by phone during business hours.


The Rinnai RU199iN is a highly efficient and reliable tankless hot water heater that offers instant hot water, consistent temperature, and energy savings. Its compact size and durable construction make it a top choice for homeowners looking to upgrade their hot water system. With its impressive features, positive user feedback, and reputable brand name, the Rinnai RU199iN is an excellent investment for any household.

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