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10 Best Rinnai Tankless 2025 in the United States

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Our Top Picks

#1

Winner

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 Rinnai RX199iN is a versatile tankless water heater that can be powered by natural gas or propane and installed indoors or outdoors. With a maximum flow rate of up to 11.1 gallons per minute, it can support multiple fixtures simultaneously, which is ideal for families or homes with high hot water demands. Its compact design, roughly the size of a small suitcase, makes it easier to install in various spaces without taking up too much room.

One of its standout features is its energy efficiency, boasting a UEF rating of .98, which means it can help save on utility bills while providing hot water on demand. The Smart Sense gas control system enhances user convenience, but keep in mind that it requires professional installation, which might be an additional cost for homeowners.

The quick flush feature simplifies maintenance, which is a plus for users who may not have much experience with water heaters. However, the reliance on professional installation could deter DIY enthusiasts or those looking to save on installation costs. The WiFi control is available but requires an additional module, which may not appeal to everyone. The Rinnai RX199iN is a solid choice for households seeking a reliable and efficient tankless water heater.

Customer Highlights

A summary of real customer reviews to highlight what shoppers are saying!
Flow Rate (GPM)
Quick to heat up and never runs out of hot water, even with multiple fixtures in use.
Temperature Rise
Water gets hot almost immediately, and the compact design frees up space in the basement.
Size and Installation
Fairly easy to install, especially in smaller spaces, but be prepared for additional costs like water polishers and condensate neutralizing capsules.
Warranty and Support
Great ratings and known for lasting longer than cheaper alternatives.
#2

Rinnai RE199iN Non-Condensing Natural Gas Tankless Water Heater, Up to 9.8 GPM, Indoor Installation, 199,000 BTU

The Rinnai RE199iN Non-Condensing Natural Gas Tankless Water Heater is a compact solution offering a strong flow rate of up to 7.6 gallons per minute (GPM), which is sufficient to supply hot water to multiple fixtures simultaneously. Its smart design, featuring an LED display for service reminders and error codes, further enhances its user-friendliness and serviceability. The heater is powered by natural gas and boasts a high energy efficiency by heating water only when necessary, helping to conserve energy effectively.

The unit's compact size, akin to a small suitcase, makes it suitable for indoor installations where space might be limited. It is designed for wall mounting, which further aids in saving space. For durability, Rinnai offers a comprehensive warranty: 15 years for the heat exchanger, 5 years for parts, and 1 year for labor, providing peace of mind to users.

Professional installation is recommended, which could add to the initial setup costs. Additionally, some users might need the optional Controlr module for WiFi control, which is not included. Considering its capacity and features, this unit is well-suited for households with significant hot water demands looking for a dependable and efficient water heating solution.

Customer Highlights

A summary of real customer reviews to highlight what shoppers are saying!
Flow Rate (GPM)
This water heater delivers hot water when you need it, just as expected.
Energy Efficiency
The unit works great and doesn't break the bank, being more affordable than high-end conventional units.
Fuel Type
The unit requires both gas and electricity, which might need an upgrade to your gas line and valve.
Size and Installation
Professional installation is recommended as the venting process can be complex and costly.
#3

Rinnai RE199eN Non-Condensing Natural Gas Tankless Water Heater, Up to 9.8 GPM, Outdoor Installation, 199,000 BTU

The Rinnai RE199eN Non-Condensing Natural Gas Tankless Water Heater offers a strong flow rate of up to 9.8 GPM, making it suitable for larger households needing multiple fixtures operating simultaneously. Its energy-efficient design, which heats water only when necessary, helps conserve energy and reduce utility bills. This model uses natural gas, making it a cost-effective choice for many homes.

The compact size, comparable to a small suitcase, allows for flexible installation options, especially for outdoor setups, freeing up indoor space. The heater provides a substantial temperature rise, meaning it can effectively handle cold water inflows and deliver hot water consistently. Additionally, the LED display simplifies monitoring and diagnostics by showing service reminders and error codes promptly.

On the downside, the product requires professional installation, potentially adding to the initial cost. Another consideration is its non-condensing nature, which might make it slightly less efficient compared to condensing models. However, the warranty is robust, offering 15 years on the heat exchanger, 5 years on parts, and 1 year on labor, providing peace of mind. The absence of WiFi control in the base model is a minor drawback, although an upgrade is available. This water heater is ideal for those looking for a durable, high-flow tankless solution and who are ready to invest in professional installation for optimal performance.

Customer Highlights

A summary of real customer reviews to highlight what shoppers are saying!
Fuel Type
Requires both gas and electricity, which might necessitate upgrading your gas line and valve for proper flow.
Size and Installation
Professional installation is necessary, and the venting process can be complex and expensive.

Buying Guide for the Best Rinnai Tankless

Choosing the right Rinnai tankless water heater can significantly improve your home's hot water efficiency and save you money in the long run. Tankless water heaters provide hot water on demand, which means you won't run out of hot water and you won't waste energy keeping a large tank of water hot all the time. To find the best fit for your needs, it's important to understand the key specifications and how they relate to your household's requirements.
Flow Rate (GPM)Flow rate, measured in gallons per minute (GPM), indicates how much hot water the unit can produce at a given time. This is crucial because it determines whether the heater can meet your household's hot water demands. For example, a flow rate of 3-5 GPM is suitable for small households with one or two bathrooms, while larger homes with multiple bathrooms and high hot water usage may require a flow rate of 7-10 GPM or more. To choose the right flow rate, consider the number of people in your home and the number of hot water fixtures that may be used simultaneously.
Energy EfficiencyEnergy efficiency is a measure of how effectively the water heater converts energy into hot water. This is often represented by the unit's Energy Factor (EF) or Uniform Energy Factor (UEF). Higher values indicate better efficiency, meaning the unit uses less energy to heat the water. This is important for reducing your energy bills and environmental impact. Look for models with high EF or UEF ratings if energy efficiency is a priority for you. For most users, a unit with an EF or UEF of 0.8 or higher is considered efficient.
Fuel TypeRinnai tankless water heaters can be powered by natural gas, propane, or electricity. The fuel type affects installation costs, operating costs, and performance. Natural gas and propane models typically offer higher flow rates and are more cost-effective to operate compared to electric models. However, electric models can be easier to install and may be a better option if you don't have access to gas lines. Choose the fuel type based on your home's existing infrastructure and your preferences for installation and operating costs.
Temperature RiseTemperature rise refers to the increase in water temperature that the unit can achieve. This is important because it determines how hot the water will be when it reaches your fixtures. The required temperature rise depends on the incoming water temperature and the desired output temperature. For example, if your incoming water is 50°F and you want it to be 120°F, you need a unit that can provide a 70°F temperature rise. Consider your local climate and typical incoming water temperature when choosing a unit with the appropriate temperature rise capability.
Size and InstallationThe physical size of the tankless water heater and its installation requirements are important factors to consider. Tankless units are generally more compact than traditional tank heaters, but you still need to ensure you have enough space for installation. Additionally, some models may require specific venting or electrical connections. Make sure to check the installation requirements and consult with a professional if needed to ensure the unit can be installed in your desired location. Choose a size that fits your space and meets the installation criteria for your home.
Warranty and SupportThe warranty and support offered by the manufacturer can provide peace of mind and protect your investment. A longer warranty period typically indicates the manufacturer's confidence in the product's durability and reliability. Look for models with comprehensive warranties that cover both parts and labor. Additionally, consider the availability of customer support and service options in your area. Choose a unit with a strong warranty and reliable support to ensure you can get help if any issues arise.

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