Best Rinnai Tankless Water Heaters for Outdoor Use

Hot water is essential for daily living, whether for cooking, bathing, or cleaning. Many homeowners face the challenge of running out of hot water during peak usage times, which can be frustrating. Traditional tank water heaters often fall short in meeting these demands, leading to the growing popularity of tankless water heaters.

Rinnai is a well-respected brand in the tankless water heater market, known for its reliable, energy-efficient models. Their outdoor tankless water heaters stand out for their compact designs and ability to provide endless hot water on demand. Selecting the right model involves considering factors such as flow rate, energy source, installation requirements, and warranty options.

This guide will cover the best Rinnai tankless water heaters available for outdoor installation, comparing their unique features, performance, and ideal use cases. Each model is evaluated based on user needs, ensuring you can find the perfect fit for your home.

Here’s a quick comparison of the top picks:

Features	Rinnai RE199eN	Rinnai V53DeP	Rinnai RE180eN	Rinnai RX180iN	Rinnai RX160iN
Flow Rate	9.8 GPM	5.3 GPM	8.5 GPM	10 GPM	9 GPM
BTU	199k BTU	Non-Condensing	180k BTU	Condensing	160k BTU
Energy Source	Natural Gas	Propane	Natural Gas	Propane/Natural Gas	Propane/Natural Gas
Warranty	15/5/1 Years	10/5/1 Years	15/5/1 Years	15/5/1 Years	15/5/1 Years
Special Features	WiFi Control Option	Compact Design	WiFi Control Option	Smart Sense Technology	Smart Sense Technology

Rinnai RE199eN Non-Conden…

The Rinnai RE199eN is a non-condensing natural gas tankless water heater designed for outdoor installation. This model is ideal for larger households that require a high flow rate of hot water. With a capacity of 9.8 GPM, it can support multiple fixtures simultaneously, making it a great choice for homes with high hot water demands.

What makes the RE199eN stand out is its smart design that only heats water when needed, which conserves energy and reduces costs. The unit is compact, roughly the size of a small suitcase, allowing it to fit in tight spaces. It also features an LED screen that provides service reminders and error codes, enhancing user experience.

However, the RE199eN may not be the best option for smaller households or those with lower hot water demand, as its higher capacity may lead to unnecessary energy consumption if not fully utilized. Additionally, installation requires a professional to ensure proper setup.

• Flow Rate: 9.8 GPM
• BTU: 199k
• Energy Source: Natural Gas
• Warranty: 15/5/1 Years
• WiFi Control Option

Best for: Large families with high hot water needs.

Rinnai V53DeP Propane Tan…

The Rinnai V53DeP is a compact propane tankless water heater suitable for outdoor installation. This model is perfect for smaller homes or apartments where space is at a premium. With a flow rate of 5.3 GPM, it efficiently delivers hot water for everyday tasks without taking up much room.

Its standout feature is its energy-efficient performance, heating water only when needed, which extends the unit’s lifespan. The compact design allows for installation in tight spaces, making it versatile for various settings. Additionally, the V53DeP features improved scale detection, enhancing reliability.

On the downside, the V53DeP may struggle to meet the hot water demands of larger households, especially during peak usage times. Its lower flow rate means that simultaneous usage of multiple fixtures may not be feasible.

• Flow Rate: 5.3 GPM
• Energy Source: Propane
• Warranty: 10/5/1 Years
• Compact Design
• Improved Scale Detection

Best for: Smaller homes or apartments needing efficient hot water.

Rinnai RE180eN Non-Conden…

The Rinnai RE180eN is another non-condensing natural gas tankless water heater, offering an 8.5 GPM flow rate. This model is suitable for medium to large households that frequently use multiple hot water fixtures simultaneously. Its efficient design ensures a steady supply of hot water, making it a reliable choice.

This model features a compact design, with an LED screen for error codes and service reminders, helping users stay informed about the unit’s performance. Its energy-efficient operation also ensures lower energy bills over time, as it heats water on demand.

However, like the RE199eN, it may not be ideal for smaller households due to its higher capacity, potentially leading to energy waste. Professional installation is also recommended for optimal performance.

• Flow Rate: 8.5 GPM
• BTU: 180k
• Energy Source: Natural Gas
• Warranty: 15/5/1 Years
• LED Screen for Alerts

Best for: Medium to large families needing reliable hot water.

Rinnai RX180iN Condensing…

The Rinnai RX180iN is a condensing tankless water heater that can be installed indoors or outdoors. This flexibility makes it a versatile option for homeowners wanting to maximize space. With a flow rate of 10 GPM, it can easily support multiple hot water needs at once, ideal for larger homes.

This model features a Smart Sense gas control system, allowing for efficient heating whether powered by propane or natural gas. Its high energy efficiency factor (UEF.98) ensures lower energy costs while maintaining performance. The Quick Flush feature simplifies maintenance, making it user-friendly.

A potential drawback is the need for professional installation and potentially more complex venting requirements for outdoor setups. Homeowners should also consider the initial cost of the unit compared to non-condensing models.

• Flow Rate: 10 GPM
• Energy Source: Propane/Natural Gas
• Warranty: 15/5/1 Years
• High Efficiency: UEF.98
• Quick Flush for Maintenance

Best for: Large homes needing maximum hot water efficiency.

Rinnai RX160iN Condensing…

The Rinnai RX160iN is another highly efficient condensing tankless water heater, capable of delivering 9 GPM. This model is suitable for various household sizes, providing ample hot water for multiple fixtures. It can also be installed either indoors or outdoors, giving users flexibility in setup.

What sets the RX160iN apart is its Smart Sense technology, which optimizes heating based on demand. This feature not only enhances efficiency but also helps reduce energy consumption. The Quick Flush feature simplifies maintenance, making it easier to keep the unit running smoothly.

However, similar to the RX180iN, this model may require professional installation due to its venting needs. Some users might find the initial investment higher compared to simpler models.

• Flow Rate: 9 GPM
• Energy Source: Propane/Natural Gas
• Warranty: 15/5/1 Years
• High Efficiency: UEF.97
• Quick Flush for Maintenance

Best for: Households needing a balance of capacity and efficiency.

How We Chose These Products

Our evaluation process involved analyzing customer feedback, expert reviews, and technical specifications from Rinnai. We looked at flow rates, energy sources, warranty options, and unique features that cater to various user needs. Each model was assessed based on real-world performance and energy efficiency to ensure they meet customer expectations.

We also considered installation requirements, as proper setup is crucial for optimal performance. This guide aims to provide clear insights into each model’s strengths and weaknesses, helping buyers make informed decisions based on their specific hot water demands.

Buying Guide: What Really Matters

When choosing a tankless water heater, consider the flow rate that matches your household’s needs. Higher flow rates are essential for larger families who may use multiple hot water fixtures simultaneously. Understanding the energy source is also important; propane and natural gas have different installation requirements and cost implications.

Energy efficiency ratings, such as the Uniform Energy Factor (UEF), are critical as they indicate how much energy the unit uses compared to the hot water it produces. A higher UEF means lower energy bills and a more environmentally friendly operation. Don’t forget to check warranty options, which can provide peace of mind about the longevity and reliability of your investment.

Our Top Recommendation

For households needing a balance of capacity and efficiency, the Rinnai RX180iN stands out as the best option. Its 10 GPM flow rate, high energy efficiency, and versatile installation options make it a top choice for larger homes. For smaller households, the Rinnai V53DeP offers a reliable, compact solution that meets basic hot water needs without taking up much space.

Frequently Asked Questions

1. How do I choose the right flow rate?
Consider your household’s peak hot water usage. A flow rate of 5-6 GPM is typically sufficient for smaller families, while larger families may require 8-10 GPM.

2. Can I install a Rinnai tankless water heater myself?
It’s recommended to hire a professional for installation to ensure safety and compliance with local codes, especially for gas connections.

3. What maintenance is required for these units?
Regular flushing to remove mineral buildup and checking the venting system is essential for maintaining efficiency.

4. How do Rinnai models compare to competitors?
Rinnai models often offer higher energy efficiency and better warranties, making them a reliable choice compared to other brands.