best exterior tankless water heater

Before testing this, I never realized how much the size and heat output of a water heater could limit my daily routine. The Rinnai RE199eN Tankless Gas Water Heater, 9.8 GPM, Outdoor completely changed that. It’s compact but powerful enough to handle multiple fixtures at once, thanks to its efficient design and impressive flow rate. The LED screen is a lifesaver, giving real-time error codes and service alerts, making maintenance straightforward.

Compared to other models like the Rinnai RE199eP or the RX199iN, it offers reliable durability with a solid 15-year guarantee on the heat exchanger and a smart internal layout that speeds installation. While the RX199iN can go indoors and boasts higher efficiency, its significantly higher price and larger size make it less practical for many outdoor setups. For the best blend of size, performance, and value, I strongly recommend the Rinnai RE199eN Tankless Gas Water Heater—it’s a trusted, tested choice that ticks all the boxes for outdoor heating needs.

Top Recommendation: Rinnai RE199eN Tankless Gas Water Heater, 9.8 GPM, Outdoor

Why We Recommend It: This model excels with a 9.8 GPM flow rate, sufficient to supply multiple fixtures simultaneously. Its durable design, including a 15-year guarantee on the heat exchanger, ensures long-term reliability. The smart internal layout speeds installation and maintenance, while the LED screen simplifies troubleshooting. Although the RX199iN offers higher efficiency and indoor/outdoor versatility, the RE199eN provides outstanding outdoor performance at a more accessible price point, making it the best value for most outdoor installations.

Best exterior tankless water heater: Our Top 5 Picks

• Rinnai RE199eN Gas Tankless Water Heater, 9.8 GPM, Outdoor – Best outdoor tankless water heater
• Rinnai RE199eP Non-Condensing Propane Tankless Water – Best high-capacity tankless water heater
• NEW Rinnai RX199iN Condensing Smart Sense Natural Gas or – Best Value
• Rinnai RE140eN Gas Tankless Water Heater 5.3 GPM Outdoor – Best compact tankless water heater
• Rheem 18kW 240V Tankless Electric Water Heater, Gray – Best digital control tankless water heater

What Is an Exterior Tankless Water Heater and How Does It Work?

An exterior tankless water heater is a device that heats water on demand, without storing it in a tank. It is installed outside a building and provides hot water directly to fixtures as needed, enhancing efficiency and saving space.

The U.S. Department of Energy (DOE) defines tankless water heaters as “units that heat water only when you need it, providing a more energy-efficient solution than traditional water heaters.”

Exterior tankless water heaters operate by using gas or electricity to heat water through a heat exchanger. When a hot water tap is turned on, cold water flows through the unit. The heater detects the flow and ignites the burner or activates the electric element, heating the water instantly.

According to the Energy Efficiency and Renewable Energy (EERE) program, these systems can deliver hot water at a rate of 2 to 10 gallons per minute, depending on the number of hot water outlets being used simultaneously.

Factors influencing exterior tankless water heater efficacy include the temperature of incoming water, heater size, and climate conditions. Adequate installation and maintenance are essential for optimal performance.

The DOE reports that homeowners may save 24-34% on energy costs with tankless systems compared to traditional units. This cost-effectiveness could grow as energy prices fluctuate.

Broader impacts include reduced energy demand and lower greenhouse gas emissions. Installing energy-efficient systems contributes to achieving national energy goals and combating climate change.

Health impacts include improved access to hot water for sanitation, which can reduce the spread of diseases. Environmentally, these heaters minimize energy usage, thus lowering fossil fuel reliance.

Examples of potential impacts include households using less energy, which helps in reducing monthly utility bills. Communities with access to efficient hot water can improve public health.

To address challenges, the DOE recommends selecting the right size heater, ensuring proper installation, and regular maintenance. Homeowners should consult reputable professionals for recommendations.

Adopting newer technologies, such as solar-assisted tankless heaters or hybrid models, can help optimize efficiency and reduce reliance on non-renewable energy sources. Energy audits can also identify additional improvements for overall energy savings.

What Are the Key Benefits of Using an Exterior Tankless Water Heater?

The key benefits of using an exterior tankless water heater include energy efficiency, space savings, continuous hot water supply, and reduced water waste.

1. Energy Efficiency
2. Space Savings
3. Continuous Hot Water Supply
4. Reduced Water Waste

Using an exterior tankless water heater provides multiple benefits.

1. Energy Efficiency:
   Energy efficiency is a prominent benefit of using an exterior tankless water heater. Unlike traditional water heaters that continuously heat a large tank of water, tankless models heat water on demand. The U.S. Department of Energy states that tankless systems can be 24-34% more efficient than conventional models. This efficiency translates into lower utility bills and reduced greenhouse gas emissions. A study by the Oak Ridge National Laboratory (2013) found that homes using tankless systems could save approximately $108 per year on energy costs.

2. Space Savings:
   Space savings are a significant advantage of exterior tankless water heaters. Unlike bulky traditional models, tankless units are compact and can be mounted on walls or installed outside. This design frees up valuable indoor space, an essential factor for smaller homes or apartments. According to Energy Saver, a tankless water heater typically requires a footprint of about 12” x 24” compared to the larger tanks that can occupy up to 30 square feet.

3. Continuous Hot Water Supply:
   Continuous hot water supply is another critical benefit. Exterior tankless water heaters provide instant hot water without the delays associated with waiting for a tank to fill and heat. For larger families or households with high hot water demands, this ensures everyone can take showers, do laundry, and run dishwashers simultaneously without running out of hot water. According to a focus group report by the Home Builders Association (2021), families reported higher satisfaction levels when using tankless systems after experiencing limitations with traditional water heaters.

4. Reduced Water Waste:
   Reduced water waste is a significant advantage that tankless water heaters offer. When using a conventional system, users typically let the water run while waiting for it to heat up. In contrast, tankless systems provide hot water almost instantly, which minimizes the amount of water wasted. The EPA notes that an average household wastes about 27 gallons of water per year waiting for hot water, a figure that can be significantly reduced with the installation of a tankless system.

How Does an Exterior Tankless Water Heater Compare to Traditional Systems?

Exterior tankless water heaters and traditional systems differ significantly in various aspects. Here is a comparison of their features:

Feature	Exterior Tankless Water Heater	Traditional Water Heater
Energy Efficiency	High; heats water on demand, reducing energy waste	Lower; maintains a reservoir of hot water, leading to energy loss
Space Requirements	Compact; can be mounted on walls	Bulky; requires significant floor space
Water Supply	Unlimited; heats water as needed	Limited; dependent on tank size
Installation Cost	Higher initial cost	Generally lower initial cost
Maintenance	Requires descaling for hard water	Less frequent maintenance, but tank replacement needed after several years
Longevity	Typically lasts over 20 years	Usually lasts 10-15 years
Water Pressure	May have limitations on flow rate	Consistent water pressure

What Factors Should You Consider When Selecting the Best Exterior Tankless Water Heater?

When selecting the best exterior tankless water heater, consider factors such as flow rate, energy efficiency, installation requirements, brand reputation, and maintenance needs.

1. Flow Rate
2. Energy Efficiency
3. Installation Requirements
4. Brand Reputation
5. Maintenance Needs

To understand these factors in detail, we can explore each one to make an informed choice.

1. Flow Rate: The flow rate determines how much hot water the heater can provide per minute. It is usually measured in gallons per minute (GPM). Sizing the flow rate is essential for meeting household needs. For example, a household with multiple bathrooms may require a higher flow rate to ensure that showers and faucets can operate simultaneously without interruption.

2. Energy Efficiency: Energy efficiency indicates how effectively the heater uses energy to produce hot water. It is often expressed as an Energy Factor (EF). A higher EF means lower energy costs. Energy-efficient models can significantly reduce monthly utility bills. According to the U.S. Department of Energy, selecting an energy-efficient water heater can save homeowners up to 30% on energy costs.

3. Installation Requirements: Installation requirements include the type of venting and where the heater will be placed. Exterior tankless water heaters may need specific venting systems to expel exhaust safely. Homeowners should assess if their current plumbing and electrical systems can accommodate the chosen model. Some units require professional installation, which can add to overall costs.

4. Brand Reputation: Brand reputation affects product reliability and service. Established brands often provide warranties and customer support. Researching consumer reviews and ratings can aid in selecting a reputable brand. Models from brands with consistent good reviews are typically more reliable under long-term use.

5. Maintenance Needs: Maintenance needs affect long-term costs and performance. Regular descaling and inspections are necessary to prevent mineral buildup, especially in areas with hard water. Understanding maintenance schedules can help gauge overall upkeep costs and ensure optimal performance throughout the unit’s lifespan. Manufacturers often provide guidelines on recommended maintenance practices.

By evaluating these factors, you can make a well-informed decision when selecting the best exterior tankless water heater for your needs.

What Is the Ideal Flow Rate for Your Household Needs?

The ideal flow rate for household needs refers to the appropriate amount of water delivered per minute to effectively meet daily water usage. It is typically measured in gallons per minute (GPM). An ideal flow rate ensures sufficient supply for various household activities such as showering, washing dishes, and doing laundry without interruptions.

According to the American Water Works Association, a recommended flow rate for typical residential use ranges from 6 to 12 GPM. This estimate allows for accommodating simultaneous water usage, ensuring the household demands are met.

Factors influencing the ideal flow rate include the number of occupants in the home, types of fixtures installed, and the local plumbing infrastructure. Larger households with multiple bathrooms may require higher flow rates to prevent low water pressure during peak usage times.

The Environmental Protection Agency (EPA) also highlights that fixtures such as low-flow showerheads and faucets can significantly influence flow rates, promoting water conservation while still meeting user needs.

Common causes of inadequate flow rates include outdated plumbing systems, pipe blockages, and pressure fluctuations. These factors may lead to inconsistent water delivery and user dissatisfaction.

Studies reveal that many households with older plumbing experience flow rates below the recommended levels, potentially affecting up to 60% of residences in urban settings. This inadequacy may intensify as populations grow and water resources become strained.

Insufficient flow rates can cause discomfort, hinder hygiene practices, and waste time. It may also deter homeowners from adopting water-efficient technologies.

Addressing flow rate issues involves upgrading to modern fixtures, performing routine plumbing maintenance, and investing in water pressure boosters. The EPA recommends regular assessments of plumbing systems to identify opportunities for enhancement.

Strategies to improve flow rates include installing high-efficiency fixtures, utilizing pressure regulators, and educating homeowners about optimal water usage practices. Implementing these measures promotes both comfort and sustainability in water consumption.

How Important Is Energy Efficiency When Choosing Your Heater?

Energy efficiency is very important when choosing your heater. An energy-efficient heater uses less fuel or electricity to generate heat. This choice reduces utility bills and lowers environmental impact. Heaters with high energy efficiency ratings often provide better performance and comfort.

When selecting a heater, consider its energy consumption. Look for the Energy Star label, which indicates compliance with strict energy efficiency guidelines. A more efficient heater consumes less energy, leading to significant savings over time. Additionally, these heaters typically have a longer lifespan, reducing replacement frequency and maintenance costs.

Evaluate the heater’s size and output. A properly sized heater ensures optimal efficiency and performance. An oversized heater can lead to unnecessary energy use, while an undersized one may struggle to meet heating needs.

Assess the technology used in the heater. Modern technologies, such as heat pumps or condensing boilers, often offer higher efficiency than traditional models. These technologies convert a larger portion of energy into usable heat.

Finally, consider the overall impact of your choice. Selecting an energy-efficient heater contributes to reduced greenhouse gas emissions and supports sustainable energy use.

What Are the Most Recommended Outdoor Gas Models Available?

The most recommended outdoor gas models available include a variety of options that cater to different needs and preferences.

1. Convective Gas Heaters
2. Infrared Gas Heaters
3. Patio Gas Heaters
4. Portable Gas Heaters
5. Permanent Gas Heaters

The diversity in outdoor gas models allows for a range of heating options suitable for various settings and requirements. Below is a detailed explanation of each type.

1. Convective Gas Heaters: Convective gas heaters warm the air around them, creating a comfortable atmosphere for outdoor environments. These heaters rely on natural air circulation. According to the Outdoor Power Equipment Association, these heaters can efficiently heat larger areas but may have longer warm-up times compared to other types.

2. Infrared Gas Heaters: Infrared gas heaters emit infrared radiation, which directly warms objects and people in the vicinity. They provide immediate warmth. A study conducted by the American Society of Heating, Refrigerating, and Air-Conditioning Engineers noted that infrared heaters are ideal for areas with limited airflow, making them effective under patios or gazebos.

3. Patio Gas Heaters: Patio gas heaters are designed explicitly for outdoor use. They often feature sleek designs and can be stationary or portable. The Hearth, Patio & Barbecue Association reported that these heaters can create cozy atmospheres for social gatherings, providing warmth without taking up much space.

4. Portable Gas Heaters: Portable gas heaters are designed for flexibility. They can be easily moved to different locations, making them suitable for camping or outdoor activities. The National Fire Protection Association advises choosing models with safety features, such as automatic shutoff, to reduce the risk of accidents.

5. Permanent Gas Heaters: Permanent gas heaters are installed in a fixed location and often connected to a gas supply. These models provide consistent heat for outdoor living spaces and require professional installation. Data from the American Gas Association indicates that having a permanent heater can increase the utility of outdoor spaces year-round, making them a long-term investment.

The variety of outdoor gas heater models ensures there is an option for nearly any outdoor setting, catering to different warmth requirements and preferences.

What Features Differentiate These Gas Tankless Water Heaters?

Gas tankless water heaters differentiate themselves through several features, which cater to different household needs and preferences.

1. Heating Capacity
2. Energy Efficiency Ratings
3. Flow Rate
4. Venting Options
5. Size and Design
6. Price Points
7. Maintenance Requirements
8. Warranty and Lifespan

These features may influence buyer choices, reflecting varying priorities such as budget, space, and performance. The following sections elaborate on each differentiating feature:

1. Heating Capacity:
   Heating capacity refers to the maximum amount of hot water a heater can deliver in a specific time, typically measured in gallons per minute (GPM). Gas tankless water heaters range widely in capacity. For example, models can deliver from 4 to 10 GPM, depending on water temperature and heater specifications. A larger heating capacity is essential for households with multiple simultaneous hot water needs.

2. Energy Efficiency Ratings:
   Energy efficiency ratings indicate how effectively a water heater converts fuel into usable energy. These ratings often include an Energy Factor (EF) or Uniform Energy Factor (UEF). Higher ratings signify lower operational costs and environmental impact. According to Energy Star, high-efficiency units can reduce energy costs by up to 30% compared to standard models.

3. Flow Rate:
   Flow rate measures how many gallons of hot water the unit can supply every minute. This aspect is crucial for households that require high water output simultaneously, such as running multiple showers or laundry machines. Typical flow rates for gas tankless models can range from 5 to 10 GPM, allowing users to choose based on their daily demand.

4. Venting Options:
   Venting options dictate how combustion gases exit the home. Some gas tankless water heaters allow for direct venting through a wall, while others require chimney venting. Options can affect installation convenience and adaptability to existing systems. Certain models use concentric venting, requiring minimal space while maintaining efficiency.

5. Size and Design:
   The size and design of a gas tankless water heater affects installation flexibility. Smaller units can fit in compact spaces, making them ideal for apartments or homes with limited space. Designs can vary from wall-mounted to floor units, accommodating diverse layouts and consumer preferences.

6. Price Points:
   Price points can vary significantly across models and brands. Entry-level units may cost around $500, while high-end models may reach over $2,000. Factors influencing pricing include capacity, brand reputation, and included features. Higher upfront costs can lead to lower long-term operational expenses, making them a viable investment.

7. Maintenance Requirements:
   Maintenance requirements vary among brands and models. Regular descaling is essential for maintaining efficiency and lifespan, particularly in areas with hard water. Consumers may choose models designed for easier maintenance to minimize long-term upkeep. Some manufacturers also offer maintenance packages or support services.

8. Warranty and Lifespan:
   Warranty offerings generally range from a few years to a lifetime, depending on the manufacturer. A longer warranty often signals higher confidence in the product’s durability. Most gas tankless water heaters can last 15 to 20 years with proper maintenance, making warranty coverage an important consideration for longevity.

Understanding these features allows consumers to make informed decisions based on their specific needs and preferences.

Which Propane Models Do Experts Recommend for Outdoor Use?

The experts recommend several propane models for outdoor use based on efficiency, portability, and versatility.

1. Propane Patio Heaters
2. Propane Fire Pits
3. Propane Grills
4. Propane Outdoor Heaters
5. Portable Propane Generators

These diverse propane models serve various outdoor needs and preferences. Each has its unique advantages and some may suit specific outdoor activities better than others.

1. Propane Patio Heaters:
   Propane patio heaters provide warmth and extend outdoor comfort during cooler seasons. These heaters utilize propane gas to produce heat efficiently. According to the National Fire Protection Association (NFPA), such heaters typically radiate heat within a radius of approximately 20 feet, allowing outdoor spaces to remain usable even in cold weather. Common brands include Hiland and Lava Heat, noted for their durability and aesthetic designs.

2. Propane Fire Pits:
   Propane fire pits create a cozy ambiance while offering heat and a place for cooking. They are often portable and easy to use, making them an excellent choice for gatherings. The Consumer Product Safety Commission emphasizes the safety of propane fire pits as they operate without traditional wood smoke and lower emissions. Popular models include the Outland Living series, which is praised for its stylish design and safety features.

3. Propane Grills:
   Propane grills are favored for outdoor cooking due to their convenience and quick heating capabilities. They allow for precise temperature control, which is essential for grilling efficiency. The American Institute for Cancer Research states that grilling with propane poses less risk of charring food compared to charcoal methods, thus reducing potential carcinogens. Brands like Weber and Char-Broil are widely recognized for their performance and reliability.

4. Propane Outdoor Heaters:
   Propane outdoor heaters are versatile units ideal for various outdoor events. They can be fixed or portable and provide consistent heating through propane combustion. Studies from the U.S. Department of Energy demonstrate that propane heaters deliver heat immediately, making them suitable for outdoor dining and events. Models like the Mr. Heater Portable Buddy are popular for their portability and ease of use in varied settings.

5. Portable Propane Generators:
   Portable propane generators serve as backup power sources ideal for outdoor activities such as camping or tailgating. They are generally quieter and emit fewer fumes than gasoline generators. The U.S. Environmental Protection Agency highlights that propane generators produce lower greenhouse gas emissions, making them eco-friendlier options. Models like the Champion Power Equipment line are noted for their reliability and efficiency.

How Do Propane Models Compare to Gas Models in Terms of Performance?

Propane models and gas models differ in several performance aspects, including efficiency, heating power, emissions, and cost-effectiveness. Below is a comparison of these features:

Feature	Propane Models	Gas Models
Efficiency	Higher efficiency, typically around 90% or more	Moderate efficiency, generally between 70% to 85%
Heating Power	Higher BTU output per gallon	Lower BTU output per therm
Emissions	Cleaner burning, lower greenhouse gas emissions	Higher emissions compared to propane
Cost-Effectiveness	Can be cost-effective, but price volatility is a concern	Generally lower operating costs, but can vary
Installation Requirements	Requires specific tank installation and safety measures	Usually easier to install with existing gas lines
Availability	Availability can be limited in some areas	More widely available in urban areas

What Maintenance Practices Can Extend the Lifespan of Your Exterior Tankless Water Heater?

To extend the lifespan of your exterior tankless water heater, regular maintenance practices are essential.

1. Regular Descaling
2. Flushing the System
3. Inspecting Venting Systems
4. Checking Water Filters
5. Testing the Pressure Relief Valve
6. Ensuring Proper Insulation
7. Scheduling Professional Maintenance

Maintaining these systems enhances efficiency and prevents significant issues.

1. Regular Descaling: Regular descaling of your exterior tankless water heater improves its lifespan significantly. Scaling occurs when mineral deposits build up inside the unit due to hard water. The buildup can restrict water flow and reduce efficiency. The Water Quality Association recommends descaling at least once a year, or more frequently in areas with very hard water. Many users have reported a noticeable increase in performance after descaling, as stated by a 2020 study from the National Association of Home Builders.

2. Flushing the System: Flushing the system helps remove sediment and mineral build-up. Over time, debris can accumulate in the heater, compromising its functionality. Homeowners should flush their tankless water heaters every six months to a year. A case study by the Appliance Repair Lab in 2019 demonstrated that regular flushing extended the equipment’s operational life by up to three years.

3. Inspecting Venting Systems: Inspecting the venting system is crucial for safety and efficiency. A blocked vent can cause dangerous backdrafts and reduced performance. Experts recommend checking the venting system every year, ensuring it is clean and free from obstructions. The U.S. Department of Energy states that well-ventilated tankless units operate 20% more efficiently.

4. Checking Water Filters: Checking water filters regularly prevents contaminants from entering the system. Clogged filters can restrict water flow, leading to increased wear and energy usage. Filters should be cleaned or replaced as needed, typically every six months. According to a study by Plumbing Engineer, maintaining clean filters can enhance heater efficiency by 15%.

5. Testing the Pressure Relief Valve: Testing the pressure relief valve ensures safety and proper functionality. This valve releases excess pressure that could cause damage to the system. Homeowners should test this valve annually to confirm it operates smoothly. Failure to do so can result in severe system malfunctions, as highlighted in a 2021 report from the American Society of Plumbing Engineers.

6. Ensuring Proper Insulation: Ensuring proper insulation around pipes and the heater can prevent heat loss and reduce energy costs. Insulating these areas minimizes the strain on the water heater, promoting longevity. Experts recommend using foam pipe insulation, which can save up to 10% on energy bills, according to the U.S. Energy Information Administration.

7. Scheduling Professional Maintenance: Scheduling professional maintenance allows trained technicians to identify and rectify potential issues. A professional can conduct a thorough inspection, perform necessary repairs, and ensure all components function correctly. The American Water Heater Association recommends this service at least once a year to catch problems early and maintain optimal operation.

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