Best Rinnai Exterior Tankless Water Heaters

Finding the right water heater can feel overwhelming. With so many options on the market, buyers often face a confusing mix of specifications and features. Tankless water heaters promise instant hot water and energy savings, but determining the best fit for your home requires careful consideration of various factors, including installation space, fuel type, and flow rate.

Rinnai is a leading name in the tankless water heater market, known for innovative designs that efficiently deliver hot water. When selecting a unit, consider what makes a model truly great: reliable performance, energy efficiency, and ease of installation. Understanding these aspects allows you to make an informed choice that meets your household’s hot water demands.

In this roundup, we highlight the top five Rinnai exterior tankless water heaters. Each model has unique strengths and may cater to different needs. From compact designs perfect for smaller homes to high-capacity models suitable for larger families, we’ve got you covered.

Here’s a quick comparison of key specifications to help you find the best fit.

Features	Rinnai RE180eN	Rinnai RE160eP	Rinnai RE180eP	Rinnai V53DeP	Rinnai RX199iN
Flow Rate	8.5 GPM	6.1 GPM	8.5 GPM	5.3 GPM	11.1 GPM
Heat Input	180k BTU	160k BTU	180k BTU	199k BTU	199k BTU
Energy Efficiency	Yes	Yes	Yes	Yes	Ultra High
Installation Type	Outdoor	Outdoor	Outdoor	Outdoor	Indoor/Outdoor
Warranty	15/5/1 Years	15/5/1 Years	15/5/1 Years	10/5/1 Years	15/5/1 Years

Rinnai RE180eN Non-Conden…

The Rinnai RE180eN is an outdoor non-condensing natural gas tankless water heater that offers a remarkable flow rate of 8.5 GPM. It’s perfect for households with high hot water demands, supporting multiple fixtures simultaneously. This model is ideal for larger families or homes where multiple users require hot water at the same time.

What stands out about the RE180eN is its energy-efficient design that heats water only when needed. This feature not only conserves energy but also reduces utility bills. Its compact size makes it suitable for various outdoor installations, and the included LED screen provides valuable service reminders and error codes for easy maintenance.

However, potential buyers should consider that professional installation is recommended. While this ensures optimal performance and safety, it adds to the overall cost. Additionally, this model may be overkill for smaller households with lower hot water needs.

• Flow Rate: 8.5 GPM
• Heat Input: 180k BTU
• Energy Efficiency: Yes
• Installation Type: Outdoor
• Warranty: 15 years heat exchanger

Best for: Large households needing high hot water output.

Rinnai RE160eP Non-Conden…

The Rinnai RE160eP is a propane model designed for outdoor installation, delivering a solid flow rate of 6.1 GPM. This makes it a suitable choice for moderate-sized homes or smaller families who need reliable hot water without excessive capacity. It’s particularly favored by users who want a balance between efficiency and performance.

This model shines in its compact design and energy-saving features. It heats water on demand, which helps lower energy costs while ensuring hot water is always available when needed. The easy-to-read LED display offers service reminders, helping homeowners keep track of maintenance needs.

One limitation of the RE160eP is its lower flow rate compared to larger models. Households with higher simultaneous hot water demands might find it inadequate during peak usage times. Furthermore, like other Rinnai models, professional installation is advisable.

• Flow Rate: 6.1 GPM
• Heat Input: 160k BTU
• Energy Efficiency: Yes
• Installation Type: Outdoor
• Warranty: 15 years heat exchanger

Best for: Smaller families with moderate hot water needs.

Rinnai RE180eP Non-Conden…

The Rinnai RE180eP propane tankless water heater is another excellent option, offering the same impressive flow rate of 8.5 GPM as its natural gas counterpart. This model is ideal for homes that rely on propane fuel and have high hot water demands. It supports multiple fixtures simultaneously, making it a versatile choice for busy households.

Its standout feature is the energy-efficient operation, which only heats water as needed. This reduces energy waste and helps save on monthly bills. The compact size allows for easy outdoor installation, and the unit includes a user-friendly LED interface for quick troubleshooting and maintenance.

Like other Rinnai models, the RE180eP requires professional installation, which may deter some DIY enthusiasts. Additionally, potential buyers should note that while it’s powerful, it may be more than necessary for smaller homes.

• Flow Rate: 8.5 GPM
• Heat Input: 180k BTU
• Energy Efficiency: Yes
• Installation Type: Outdoor
• Warranty: 15 years heat exchanger

Best for: Homes using propane with high hot water demand.

Rinnai V53DeP Propane Tan…

The Rinnai V53DeP is a compact propane tankless water heater designed for outdoor installation. It delivers a flow rate of 5.3 GPM, making it great for smaller homes or apartments. This model is perfect for individuals or couples who might not have high simultaneous hot water needs.

What sets the V53DeP apart is its space-saving design, allowing it to fit into tight outdoor spaces without compromising performance. It also features energy-efficient technology, heating water only when needed, which maximizes efficiency and reduces utility costs.

However, the limited flow rate may not suffice for larger families or homes with multiple bathrooms. Users should consider their hot water needs carefully before choosing this model. Additionally, like all Rinnai products, it requires professional installation for optimal performance.

• Flow Rate: 5.3 GPM
• Heat Input: 199k BTU
• Energy Efficiency: Yes
• Installation Type: Outdoor
• Warranty: 10 years heat exchanger

Best for: Individuals or couples in smaller homes.

Rinnai RX199iN Condensing…

The Rinnai RX199iN is a versatile condensing tankless water heater that can operate on either natural gas or propane. With a high flow rate of 11.1 GPM, it’s perfect for larger households with high hot water needs. This model can handle multiple fixtures at once, making it ideal for busy families.

This unit’s standout feature is its Smart Sense technology, which optimizes energy use based on demand. This increases efficiency significantly, while its compact size ensures it fits in various installation scenarios, whether indoors or outdoors. Additionally, the high UEF rating of.98 indicates exceptional energy efficiency.

Despite its advantages, the RX199iN may come with a higher upfront investment. Users should also note that while it offers flexibility in fuel options, the installation can be more complex and might require a professional to ensure proper setup.

• Flow Rate: 11.1 GPM
• Heat Input: 199k BTU
• Energy Efficiency: UEF.98
• Installation Type: Indoor/Outdoor
• Warranty: 15 years heat exchanger

Best for: Large households needing extensive hot water.

How We Chose These Products

To compile this list of top Rinnai exterior tankless water heaters, we evaluated each model based on several criteria. First, we considered performance metrics such as flow rate and BTU input to ensure each unit could meet various household demands. Energy efficiency was another critical factor, as buyers are increasingly focused on long-term savings and environmental impact.

We also examined user feedback and expert reviews to gauge real-world performance and reliability. Each model was analyzed for its installation requirements, warranty coverage, and overall design to ensure we recommended products that deliver value and satisfaction.

Buying Guide: What Really Matters

When shopping for a tankless water heater, consider your household’s hot water needs. Assess the number of fixtures you might use simultaneously and choose a model that provides adequate flow rate. Additionally, think about the fuel type available in your area, whether natural gas or propane, and ensure compatibility with your existing systems.

Energy efficiency ratings are crucial, as higher ratings often translate to lower utility bills. Look for models with smart technology that can optimize energy use. Lastly, professional installation is highly recommended for these systems, so factor in installation costs when budgeting your purchase.

Our Top Recommendation

For those needing a high flow rate and energy efficiency, the Rinnai RX199iN stands out as the top choice. Its ability to run on both natural gas and propane, along with its impressive capacity, makes it a versatile option. For smaller households, the Rinnai V53DeP offers a compact solution without sacrificing performance.

Frequently Asked Questions

What should I consider before buying a tankless water heater?

Consider flow rate, energy efficiency, and installation requirements. Assess your household’s hot water needs and choose accordingly.

Can I install a Rinnai tankless water heater myself?

Professional installation is recommended to ensure safety and optimal performance, especially with gas connections.

What is the lifespan of a Rinnai tankless water heater?

On average, Rinnai tankless water heaters can last over 20 years with proper maintenance.

How does a tankless water heater save energy?

Tankless models heat water on demand, which means they only use energy when hot water is needed, reducing waste.

For more insights on Rinnai tankless water heaters, check out articles on Rinnai vs Navien and getting hot water faster.