Best Rinnai Tankless Water Heaters

Running out of hot water during a shower can be frustrating, especially when you have a busy household. Traditional tank water heaters often struggle to keep up with demand, leading to cold surprises at the worst times. Tankless water heaters, particularly those from Rinnai, provide an efficient solution by heating water on demand, ensuring a continuous supply of hot water whenever you need it.

When choosing a tankless water heater, several factors come into play: the flow rate (measured in gallons per minute), energy efficiency, installation options, and the type of fuel used (natural gas or propane). A great choice balances capacity with efficiency, ensuring your home runs smoothly without the hassle of running out of hot water.

This roundup covers the top 5 Rinnai tankless water heaters, each offering unique features tailored to various household needs. Whether you require a compact solution for a small home or a high-capacity model for larger demands, our selection encapsulates the best options currently available.

Compare key specifications and features at a glance in the table below:

Features	Rinnai RX180iN	Rinnai RE180iN	Rinnai RX199iN	Rinnai RX130iN	Rinnai RE160eP
Installation Type	Indoor/Outdoor	Indoor	Indoor/Outdoor	Indoor/Outdoor	Outdoor
Flow Rate	10 GPM	8.5 GPM	11.1 GPM	7.1 GPM	6.1 GPM
Energy Efficiency	UEF.98	UEF.82	UEF.98	UEF.97	UEF.82
BTUs	180k	180k	199k	130k	160k
Best Use Case	6 Fixtures	5 Fixtures	7 Fixtures	4 Fixtures	5 Fixtures

Rinnai RX180iN Condensing…

The Rinnai RX180iN is a condensing smart sense tankless water heater designed for both indoor and outdoor installation. This model is perfect for medium to large households that require a steady supply of hot water for multiple fixtures simultaneously, supporting up to 10 gallons per minute (GPM). It’s ideal for families who enjoy long showers or have multiple appliances running at once.

This unit stands out with its compact size, comparable to a small suitcase, making it easy to fit in various spaces. The RX180iN features a Smart Sense gas control system that optimizes energy usage, boasting an impressive UEF of.98. The Quick Flush feature simplifies maintenance, allowing for easier flushing compared to older models.

However, some users might find the installation process complicated. It’s recommended to hire a professional technician to ensure proper setup. Additionally, while the Smart Sense technology is efficient, it might take some time for users to get accustomed to adjusting settings through the app.

• Installation: Indoor/Outdoor
• Flow Rate: 10 GPM
• Energy Efficiency: UEF.98
• BTUs: 180k
• Best for: Medium to large homes

Rinnai RE180iN Non-Conden…

The Rinnai RE180iN is a non-condensing tankless water heater specifically designed for indoor use. With a flow rate of 8.5 GPM, it’s ideal for medium-sized homes where several fixtures might be in use at the same time, such as showers and washing machines. This unit is particularly suited for homeowners who prioritize energy efficiency without the need for outdoor installation.

This model excels in its user-friendly design, featuring a clean internal layout that simplifies installation and maintenance. An LED screen provides service reminders and error codes, helping users troubleshoot issues quickly. The RE180iN is built to heat water only when needed, effectively conserving energy and reducing utility bills.

On the downside, the RE180iN may not provide sufficient hot water for larger households, especially during peak times. If you have a high demand for hot water, you may need to consider a model with a higher flow rate. Additionally, not having outdoor installation capability can limit its placement options.

• Installation: Indoor
• Flow Rate: 8.5 GPM
• Energy Efficiency: UEF.82
• BTUs: 180k
• Best for: Medium-sized homes

Rinnai RX199iN Condensing…

The Rinnai RX199iN is a top-tier condensing tankless water heater that offers impressive performance with a flow rate of 11.1 GPM. This makes it suitable for larger households that might need to run several appliances simultaneously without sacrificing hot water availability. It’s an excellent choice for families with high hot water demands.

This model features the same Smart Sense gas control system as the RX180iN, enhancing energy efficiency with a UEF rating of.98. The compact design allows for versatile installation options, both indoors and outdoors. Its Quick Flush feature also adds convenience for maintenance, making it easier to keep the unit running smoothly.

The RX199iN isn’t without its challenges. Its higher capacity may lead to increased energy use if not managed correctly. Homeowners should be mindful of their hot water consumption patterns to avoid unexpected spikes in utility bills. Additionally, professional installation is essential to ensure optimal performance.

• Installation: Indoor/Outdoor
• Flow Rate: 11.1 GPM
• Energy Efficiency: UEF.98
• BTUs: 199k
• Best for: Large households

Rinnai RX130iN Condensing…

The Rinnai RX130iN is a versatile condensing tankless water heater suitable for both indoor and outdoor installations. With a flow rate of 7.1 GPM, it’s ideal for smaller to medium-sized homes where a few fixtures may be used simultaneously, making it a solid choice for couples or small families.

This model stands out for its energy efficiency, with a UEF of.97, ensuring you won’t be wasting energy while enjoying hot water. The compact design makes it easy to install in various locations, which is a significant advantage for those with limited space. Like its counterparts, it features a Quick Flush option for easy maintenance.

However, while the RX130iN is efficient, it may not provide enough hot water for larger households during peak usage times. Users need to consider their daily hot water needs before opting for this model. Additionally, its outdoor installation requirements may limit where it can be placed.

• Installation: Indoor/Outdoor
• Flow Rate: 7.1 GPM
• Energy Efficiency: UEF.97
• BTUs: 130k
• Best for: Small to medium homes

Rinnai RE160eP Non-Conden…

The Rinnai RE160eP is a non-condensing propane tankless water heater designed for outdoor installation. With a flow rate of 6.1 GPM, it is best suited for smaller homes or outdoor settings, where it can efficiently provide hot water for up to five fixtures. This model is ideal for those who need reliable performance in areas without available natural gas lines.

This unit’s design emphasizes energy conservation, heating water only when necessary. Its compact size allows for easy placement in outdoor spaces, making it a perfect solution for homes with limited indoor installation options. The RE160eP also includes helpful LED error codes to keep maintenance straightforward.

On the downside, its lower flow rate may not satisfy larger families, especially during peak-demand situations. Additionally, being a propane unit limits its fuel source options, which could be a consideration for some homeowners.

• Installation: Outdoor
• Flow Rate: 6.1 GPM
• Energy Efficiency: UEF.82
• BTUs: 160k
• Best for: Small homes

How We Chose These Products

Our evaluation of the best Rinnai tankless water heaters involved analyzing several key factors, including energy efficiency, flow rate, and installation versatility. We also considered customer feedback and expert reviews to ensure each model meets real-world needs. The focus was on identifying units that not only perform well but also offer great value and reliability for consumers.

We prioritized models that cater to a variety of household sizes and hot water needs. This way, our recommendations encompass a wide range of scenarios, ensuring there’s a suitable option for everyone. Each product was assessed based on its unique features and how they would perform in different home environments.

Buying Guide: What Really Matters

When selecting a tankless water heater, consider the flow rate, which measures how much hot water the unit can provide at once. This is especially important for larger households with multiple fixtures in use. Energy efficiency ratings, such as the Uniform Energy Factor (UEF), also play a significant role in potential energy savings over time.

Installation options are another critical factor. Depending on your home’s layout and energy sources available, you may need a unit that can be installed indoors or outdoors and can use either natural gas or propane. Always consult with a professional installer to ensure the chosen model fits your home’s specific requirements.

Our Top Recommendation

The Rinnai RX199iN emerges as the top recommendation due to its impressive flow rate and energy efficiency, making it suitable for a wide range of households. It’s an excellent choice for those needing a reliable supply of hot water without the worry of running out. For smaller homes or those with less demand, the Rinnai RX180iN offers a balance of performance and efficiency, while the Rinnai RE160eP is a solid option for outdoor setups.

Frequently Asked Questions

What is the lifespan of a Rinnai tankless water heater? Rinnai tankless water heaters typically last 15 to 20 years with proper maintenance.

Can I install a Rinnai tankless water heater myself? Professional installation is highly recommended to ensure safety and optimal performance.

What maintenance do Rinnai models require? Regular flushing and occasional inspection for leaks and corrosion are essential for maintaining performance.

Are Rinnai tankless water heaters energy efficient? Yes, most Rinnai models feature high energy efficiency ratings, helping to reduce utility bills.