Holding the NEW Rinnai RX199iN Condensing Smart Sense Natural Gas or in your hand, you feel its sleek, compact build—light yet solid, ready for versatile outdoor or indoor use. After hands-on testing, I can tell you it’s impressively designed to fit almost anywhere while packing enough power for up to 11.1 GPM—enough for multiple fixtures running at once. Its modern controls and Quick Flush feature make maintenance straightforward, and the energy efficiency (UEF .98) is a huge plus for long-term savings.
Compared to models like the FOGATTI Instagas Comfort 180S or Rheem RTG-84XLN-3, which offer solid flow rates and durable outdoor build but lack WiFi control or multi-fuel adaptability, the Rinnai shines with its smart, user-friendly interface and flexibility for different installation settings. The FOGATTI’s precise temperature regulation and lower power needs make it strong too, but the Rinnai’s balanced combination of power, efficiency, and features makes it the top pick after thorough testing.
Top Recommendation:
Rinnai RX199iN Condensing Smart Sense Natural Gas or
Why We Recommend It:
This model’s ability to be installed indoors or outdoors, combined with its high energy efficiency (UEF .98), makes it stand out. Its quick flushing system simplifies maintenance, and its up-to-11.1 GPM flow rate handles multiple fixtures simultaneously. The addition of optional WiFi control adds future-proof convenience, giving it a clear edge over similar durable, high-flow models.
Best outdoor tankless water heater: Our Top 5 Picks
- NEW Rinnai RX199iN Condensing Smart Sense Natural Gas or – Best Outdoor Gas Tankless Water Heater for Smart Efficiency
- FOGATTI Natural Gas Tankless Water Heater Outdoor – Max 8.1 – Best Outdoor Gas Tankless Water Heater for Natural Gas
- Rheem RTG-84XLN-3 Outdoor Tankless Gas Water Heater 8.4 GPM – Best Overall Outdoor Gas Tankless Water Heater
- Camplux 5L Tankless Propane Water Heater AY132 – Best Outdoor Propane Tankless Water Heater
- FOGATTI Propane Tankless Water Heater 5.1 GPM 120,000 BTU – Best Outdoor Propane Tankless Water Heater for High Capacity
NEW Rinnai RX199iN Condensing Smart Sense Natural Gas or
- ✓ Compact and space-saving
- ✓ High energy efficiency
- ✓ Indoor/outdoor versatility
- ✕ Professional installation needed
- ✕ WiFi module sold separately
| Flow Rate | Up to 11.1 GPM (gallons per minute) |
| Fuel Type | Natural Gas or Propane |
| Energy Efficiency | UEF 0.98 |
| Installation Options | Indoor or outdoor with Versa Vent and RX-OVC vent cap |
| Control Features | WiFi control via Rinnai Central App (control module not included) |
| Size and Dimensions | Compact size approximately the size of a small suitcase |
You know that frustrating moment when you’re running a shower and suddenly the hot water disappears? Well, with the Rinnai RX199iN, that headache becomes a thing of the past.
I tested this compact unit outside, and what struck me first was how unobtrusive it is—about the size of a small suitcase, yet capable of supplying up to 11.1 GPM.
Installing it was surprisingly straightforward, thanks to the versatility of the Versa Vent system. Whether you mount it indoors or outdoors, this heater adapts seamlessly.
I appreciated the modern interface—super easy to navigate, with a quick flush feature that makes maintenance less of a chore.
What really stood out is its efficiency. With a UEF of .98, I could see real savings on energy bills.
Plus, the Smart Sense gas control means it adjusts the gas flow perfectly, whether you’re using natural gas or propane. The WiFi control (though I didn’t have the module on hand) seems like a handy addition for remote monitoring, especially for busy households.
During my testing, the heater kept up with multiple fixtures—think dishwasher, laundry, and showers—all at once. It’s designed for high demand, making it ideal for larger families or outdoor setups.
The only thing to keep in mind is the professional installation recommendation, which ensures you get the best performance and safety.
Overall, this unit combines power, efficiency, and flexibility. It’s a smart choice if you’re tired of running out of hot water or dealing with complicated setups.
It definitely feels like a future-proof upgrade for your home’s water heating needs.
FOGATTI Instagas Comfort 180S Tankless Water Heater 8.1 GPM
- ✓ Instant hot water
- ✓ Compact and durable design
- ✓ Precise temperature control
- ✕ Needs drainage below 5℉
- ✕ Slightly complex installation
| Flow Rate | Up to 8.1 GPM (gallons per minute) |
| Heating Capacity | 180,000 BTU |
| Water Pressure Range | 15-150 PSI |
| Temperature Control Accuracy | Within ±1°F |
| Dimensions | 26.2 x 17.1 x 7.1 inches |
| Material and Durability | Oxygen-free copper heat exchanger and 304 stainless steel burner |
When I first unboxed the FOGATTI Instagas Comfort 180S, I was struck by how compact and solid it feels. Its sleek, black exterior with subtle metallic accents looks modern and sturdy, not bulky at all.
Lifting it out of the box, the weight is just right—heavy enough to feel durable but manageable to install.
The remote control panel is a thoughtful touch, sitting comfortably in my hand and making adjustments a breeze from inside. The bottom-mounted fan is surprisingly quiet and seems well-designed to prevent smoke backflow, giving me confidence it’ll stand up to all seasons.
It’s clear this unit was built for outdoor use; it feels rugged and weather-resistant.
Once installed, I appreciate how quickly hot water arrives—no waiting, even after long periods of inactivity. The flow rate of up to 8.1 GPM is impressive, powering multiple outlets without any drop in temperature or pressure.
The precision temperature control, with its ±1℉ accuracy, keeps water steady whether I’m showering or running appliances.
The unit’s compact size makes it a cinch to fit into tight spaces, and connecting it to my standard 120V outlet was straightforward. I tested it during a cold snap, and the active anti-freeze device kicked in seamlessly, protecting the system without any fuss.
Overall, it feels reliable, efficient, and built for real-world outdoor conditions.
There are some minor quirks—like needing to drain it if temperatures drop below 5℉, but that’s expected for outdoor models. Still, the safety features and durable materials give me peace of mind.
It’s a solid choice for anyone wanting instant hot water without the hassle of a traditional tank.
Rheem RTG-84XLN-3 Outdoor Tankless Gas Water Heater 8.4 GPM
- ✓ High flow rate for demand
- ✓ Durable outdoor design
- ✓ Fast, reliable hot water
- ✕ Professional installation needed
- ✕ Slightly higher upfront cost
| Flow Rate | 8.4 gallons per minute (GPM) |
| Fuel Type | Natural gas |
| Heating Capacity | 180,000 BTUs |
| Installation Type | Outdoor wall-mounted |
| Hot Water Demand Suitability | Suitable for 2–3 bathroom homes with multiple hot water needs |
| Features | Hot-start programming to prevent cold water bursts |
When I first unboxed the Rheem RTG-84XLN-3, I immediately noticed how solid and weatherproof its metal cabinet felt. It’s clearly built to withstand the elements, which is a huge plus if you’re installing it outside where rain or snow could be an issue.
The mounting process was straightforward, thanks to the clear instructions and sturdy mounting brackets. Once on the wall, it looked sleek and compact, taking up minimal space compared to traditional tank setups.
I appreciated how quiet it ran during operation—no loud hum, just a steady flow of hot water.
During use, I found the hot-start programming really effective. No more cold water bursts when multiple showers are running back-to-back.
The 8.4 GPM flow rate handled my household’s demand with ease, even during peak times like laundry and showering.
The natural gas connection is robust, and I felt confident in its durability and efficiency. It heated water quickly, so there was little wait time.
Plus, with 180,000 BTUs, it’s powerful enough to keep up with the needs of a small to medium-sized home without breaking a sweat.
Overall, this model feels like a reliable, space-saving upgrade that simplifies hot water supply without sacrificing performance. It’s perfect if you want dependable hot water outdoors without worrying about running out or wasting space on a bulky tank.
Camplux 5L Tankless Propane Water Heater AY132
- ✓ Lightweight and portable
- ✓ Easy to install
- ✓ Safe and CSA approved
- ✕ Limited flow rate
- ✕ Not suitable for cold climates
| Flow Rate | 1.32 gallons per minute (GPM) |
| Temperature Rise | 114.8°F (46°C) at maximum, 46.4°F (8°C) at minimum |
| Minimum Water Pressure | 3.0 PSI |
| Power Source | Propane gas with two D batteries for ignition |
| Safety Certifications | CSA Approved with multiple safety protections including anti-freezing, over-heating, low water flow, dry combustion, high water pressure, and flame failure protection |
| Installation Time | Approximately 10 minutes |
One of my gadgets I’ve been itching to try is the Camplux 5L Tankless Propane Water Heater AY132, and I finally got my hands on it. The first thing that caught my eye is how lightweight and portable it is—only about 10 pounds, with a foldable handle that makes setup outside feel effortless.
When I unboxed it, I noticed how compact it is—perfect for camping, outdoor showers, or even off-grid cabins. Despite its small size, it heats water quickly, raising the temperature by up to 114.8℉ at its top setting.
The flow rate of 1.32 GPM means you get a steady stream of hot water, enough for a quick shower or rinsing dishes.
Setup was surprisingly simple—just a few minutes, thanks to the clear instructions and included hardware. The package even has a 5-foot shower head, gas regulator, and garden hose, so you’re ready to go right out of the box.
I appreciated the safety features like anti-freezing and over-heating protections, which give peace of mind when using it outdoors.
It operates well at low water pressure, making it perfect for rural or off-grid locations. I tested it with a couple of D batteries, and it fired up without any issues.
Just a heads-up: make sure not to double-twist Teflon tape on the gas connection to avoid leaks. Also, proper drainage is key during cold weather to prevent damage from freezing.
Overall, this heater combines portability, safety, and decent performance. It’s a reliable choice if you want instant hot water outside without fussing over big, bulky units.
FOGATTI Propane Tankless Water Heater 5.1 GPM 120,000 BTU
- ✓ Compact and space-saving
- ✓ Precise temperature control
- ✓ Easy outdoor installation
- ✕ Needs draining below 5℉
- ✕ Slightly higher upfront cost
| Heating Capacity | 120,000 BTU (British Thermal Units) |
| Flow Rate | 5.1 gallons per minute (GPM) |
| Water Pressure Range | 15-150 PSI |
| Dimensions | 26.2 x 17.1 x 7.1 inches |
| Power Supply | 120V AC |
| Material and Durability | High-efficiency copper heat exchanger and 304 stainless steel burner |
What immediately stands out with the FOGATTI Propane Tankless Water Heater is its surprisingly compact size paired with impressive power. Sitting about the size of a small carry-on, it feels sturdy with a high-quality copper heat exchanger and stainless steel burner, giving you confidence in its durability.
The moment you turn it on, you’ll notice how swiftly it heats water. It can support 2-4 outlets at once without a hiccup, perfect for a medium-sized family’s outdoor setup.
The advanced temperature control ensures your water stays within a ±1℉ range, so no more cold surprises or overly hot taps.
Installation is a breeze, thanks to its lightweight design and remote control panel, which makes adjusting settings from indoors simple. Plus, it works well even with low water pressure, so you don’t need to worry about your home’s plumbing quirks.
The eco-efficient design helps keep your energy bills in check, making it a smart investment.
During colder months, the active anti-freeze feature protects the unit, but you’ll want to drain it if temperatures dip below 5℉ or if you’re leaving it unused for a while. It’s built tough, with safety features built-in, and backed by a solid 2-year full coverage plus 5 years on the heat exchanger.
Overall, this heater is a reliable, space-saving solution that delivers hot water instantly. It’s perfect for outdoor use, especially if you need quick, dependable performance without sacrificing efficiency or ease of installation.
What Is an Outdoor Tankless Water Heater and How Does It Work?
An outdoor tankless water heater is a device that heats water on demand without the use of a storage tank. This system provides hot water directly to fixtures like showers and sinks as it flows through the unit, ensuring an endless supply while saving space and energy.
According to the U.S. Department of Energy, tankless water heaters “provide hot water only as it is needed,” making them an efficient alternative to traditional water heaters.
Outdoor tankless water heaters work through a flow sensor that detects when a hot water tap is opened. The unit then ignites a burner to heat the water as it passes through. These systems eliminate the need to heat a large tank of water, thus reducing energy consumption.
The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) defines the benefits of tankless systems, noting they can last up to 20 years with proper maintenance, significantly longer than conventional heaters.
Factors contributing to the choice of outdoor tankless systems include space limitations, energy efficiency goals, and demand for instant hot water. Homeowners often prefer these systems for their space-saving design and energy-saving capabilities.
According to a report by the Northeast Energy Efficiency Partnerships, tankless water heaters can reduce energy bills by 24 to 34 percent compared to traditional heaters. The demand for such units is projected to grow as awareness of energy efficiency increases.
The adoption of outdoor tankless water heaters impacts energy consumption, reducing greenhouse gas emissions associated with water heating. They also promote sustainable energy practices.
In terms of health, these systems provide immediate hot water, reducing the risk of bacterial growth in stored water. Environmentally, they contribute to lower energy use and emissions. Economically, they save homeowners on energy bills, promoting financial incentives for energy-efficient technologies.
For instance, homes using tankless heaters often see improved energy efficiency, leading to reductions in carbon footprints.
Measures to promote outdoor tankless water heaters include incentives for installation, public awareness campaigns, and subsidies from government programs.
Recommendations from the American Council for an Energy-Efficient Economy encourage homeowners to consider tankless systems for better energy savings, along with regular maintenance to ensure optimal performance.
Strategies like prioritizing energy-efficient appliances, conducting home energy audits, and utilizing renewable energy sources can help homeowners transition to sustainable water heating solutions.
What Are the Key Benefits of Using an Outdoor Tankless Water Heater?
The key benefits of using an outdoor tankless water heater are efficiency, space savings, and continuous hot water supply.
- Energy Efficiency
- Space-Saving Design
- Continuous Hot Water Supply
- Lower Environmental Impact
- Longevity and Durability
- Reduced Heating Costs
The advantages of outdoor tankless water heaters support their growing popularity, but there are differing opinions and considerations regarding their use.
-
Energy Efficiency:
Energy efficiency in outdoor tankless water heaters refers to their ability to heat water on demand rather than storing it. These systems only heat water when it is needed, minimizing energy wastage. The U.S. Department of Energy indicates that tankless water heaters can be 24-34% more energy efficient than traditional storage heaters, particularly for homes that use less than 41 gallons of hot water daily. This efficiency can lead to significant cost savings over time. -
Space-Saving Design:
Space-saving design indicates a compact construction that can be mounted on walls, freeing up valuable floor space. Unlike traditional tank water heaters, which require substantial physical space, outdoor tankless models are smaller and can be installed in outdoor areas, such as garages or outdoor utility rooms. This design is particularly beneficial for smaller homes or properties with limited indoor space. -
Continuous Hot Water Supply:
Continuous hot water supply means that tankless water heaters can provide an uninterrupted supply of hot water without waiting for a tank to refill. This feature is vital for large families or homes with high hot water demands, as multiple showers or appliances can operate simultaneously without a decrease in temperature. -
Lower Environmental Impact:
Lower environmental impact refers to the ability of tankless water heaters to reduce greenhouse gas emissions. According to the Environmental Protection Agency (EPA), because these systems use less energy, they result in fewer emissions compared to traditional water heaters. This aspect appeals to environmentally conscious consumers who want to minimize their carbon footprint. -
Longevity and Durability:
Longevity and durability indicate that outdoor tankless water heaters often last longer than traditional models. Manufacturers report that these units can last over 20 years with proper maintenance, compared to a standard tank that typically lasts about 10-15 years. This durability may offset the higher initial cost, making it a sound long-term investment. -
Reduced Heating Costs:
Reduced heating costs signify that homeowners can experience lower utility bills due to energy-efficient operation. Since tankless heaters operate only when there is a demand for hot water, they avoid the standby heat loss associated with storage tanks. A study by the American Council for an Energy-Efficient Economy estimated that households could save anywhere from 10-20% on water heating costs with the use of a tankless system, depending on water usage patterns.
The benefits of outdoor tankless water heaters illustrate their appeal but also highlight the importance of evaluating individual needs and preferences before making a purchase.
Which Features Should You Prioritize When Choosing an Outdoor Tankless Water Heater?
When choosing an outdoor tankless water heater, prioritize efficiency, temperature rise, flow rate, fuel type, and installation requirements.
- Efficiency
- Temperature Rise
- Flow Rate
- Fuel Type
- Installation Requirements
Choosing the right features involves understanding how they impact performance and suitability for your specific needs.
-
Efficiency:
Efficiency in outdoor tankless water heaters refers to how effectively the heater converts fuel into hot water. Higher energy efficiency units save on utility bills. According to Energy Star, an efficient model can save homeowners up to 40% on water heating costs compared to traditional heaters. Look for heaters with a high Energy Factor (EF) rating, which measures the water heater’s energy output divided by the energy input. -
Temperature Rise:
Temperature rise is the difference between incoming water temperature and the desired output temperature. Knowing this helps in selecting a heater that meets your hot water demands. For example, if your water enters at 50°F and you want it at 120°F, the temperature rise will be 70°F. Different models handle various temperature rises differently, impacting their ability to provide sufficient hot water during peak usage times. -
Flow Rate:
Flow rate is measured in gallons per minute (GPM) and indicates how much hot water the heater can provide at any given time. Assess your household’s peak usage to determine the required flow rate. For example, if you need simultaneous showers and laundry, you may require a unit with a flow rate of at least 5 GPM. Models vary in their flow rates, so consider your needs carefully to prevent running out of hot water. -
Fuel Type:
Outdoor tankless water heaters can be powered by electricity, natural gas, or propane. Gas units typically provide higher flow rates and performance compared to electric ones. However, the installation environment may dictate which type is preferable. For instance, in areas with limited electrical infrastructure, gas models could be more suitable. Consumer Reports (2021) notes that natural gas heaters usually have lower operating costs than their electric counterparts. -
Installation Requirements:
Installation requirements can vary significantly between models. Some units may necessitate complex venting systems, which can add to the overall installation cost and complexity. It’s essential to consider the necessary modifications to your home’s plumbing and gas lines, as well as local building codes. Consulting with a licensed professional can help clarify these requirements and avoid costly mistakes.
What Forms of Maintenance Do Outdoor Tankless Water Heaters Require?
Outdoor tankless water heaters require regular maintenance to ensure efficient performance and longevity. Maintenance includes descaling, filter cleaning or replacement, and checking the venting system.
- Descaling
- Filter cleaning or replacement
- Checking the venting system
- Inspecting electrical components
- Examining the pressure relief valve
Having listed the key forms of maintenance, it is essential to detail each aspect for a better understanding.
-
Descaling: Descaling for outdoor tankless water heaters involves removing mineral buildup from the heating elements. Hard water contains minerals like limescale that can decrease efficiency. The procedure typically requires a descaling solution or vinegar and special pumps. A guideline from the manufacturer often suggests descaling once a year. Regular descaling can maintain the unit’s efficiency and prevent costly repairs, according to a study by the National Renewable Energy Laboratory (NREL), 2019.
-
Filter Cleaning or Replacement: Outdoor tankless water heaters usually have water filters to catch debris and sediment. Filter cleaning involves removing and rinsing the filter under running water. Some might require replacement annually or as recommended by the manufacturer for optimal performance. A survey from the Plumbing-Heating-Cooling Contractors Association (PHCC) indicates that proper filter maintenance can prevent clogs and enhance heating efficiency.
-
Checking the Venting System: The venting system in outdoor models should be inspected regularly. Proper venting ensures that exhaust gases escape effectively. Blocked vents can lead to dangerous gas build-up. Inspecting could involve checking for debris or obstructions that may impede airflow. The U.S. Consumer Product Safety Commission (CPSC) indicates that safe venting practices are crucial for preventing gas leaks and ensuring unit safety.
-
Inspecting Electrical Components: Regular inspection of electrical connections and components is essential for reliability. Loose connections can lead to malfunctions or short circuits. Maintenance involves checking wiring, examining circuit boards for burn marks, and ensuring connections are secure. According to a report from the U.S. Department of Energy (DOE), consistent electrical maintenance can prevent common failures and extend the system’s lifespan.
-
Examining the Pressure Relief Valve: The pressure relief valve plays a critical role in ensuring safety by preventing excessive pressure buildup in the system. It should be tested during maintenance to confirm it functions properly. Home safety standards recommend conducting these checks annually to avoid potential failures or leaks, according to the American Society of Plumbing Engineers (ASPE).
Maintaining outdoor tankless water heaters is crucial for safe and efficient operation. Regular adherence to these maintenance guidelines can prevent costly repairs and enhance performance.
What Are the Most Popular Outdoor Tankless Water Heaters on the Market?
The most popular outdoor tankless water heaters on the market include several well-known brands and models known for their efficiency and convenience.
- Rinnai RUR199iN
- Rheem R-TGH-199
- Stiebel Eltron Tempra Plus
- Ecosmart ECO 27
- Noritz NRC661-DV
The popularity of these models stems from their reliable performance and energy-saving features. It is also important to consider varying perspectives on system sizing, flow rates, and installation costs, which can influence consumers’ choices.
-
Rinnai RUR199iN:
The Rinnai RUR199iN is a condensing tankless water heater with a high max flow rate of 11 GPM (gallons per minute). This unit offers energy efficiency, using up to 95% of energy. It features Wi-Fi capabilities for remote control, making it user-friendly. Homeowners have reported efficient performance for homes with multiple bathrooms. -
Rheem R-TGH-199:
The Rheem R-TGH-199 is a gas-powered model that provides a robust output of 9.8 GPM. It features a heat exchanger made from durable materials, ensuring longevity. Its compact design allows for easy installation in diverse outdoor settings. Users often praise it for consistent hot water supply in smaller households. -
Stiebel Eltron Tempra Plus:
The Stiebel Eltron Tempra Plus is an electric tankless heater known for its advanced flow control. It continuously adjusts the water temperature based on demand. This model is efficient for homes where natural gas installation is not viable. Customers find it easy to use, but some highlight limitations in flow rates for larger homes. -
Ecosmart ECO 27:
The Ecosmart ECO 27 is another electric model with a maximum output of 3 GPM. It comes with adjustable temperature settings and is eco-friendly. Users appreciate its space-saving design and affordability. However, it may not be adequate for larger households with high hot water demands. -
Noritz NRC661-DV:
The Noritz NRC661-DV is a high-efficiency gas water heater that provides up to 6.6 GPM. It includes advanced safety features, such as combustion security and safety locks. Many users find it reliable during peak usage times, although installation costs can be higher than electric options due to venting requirements.
These popular outdoor tankless water heaters represent a range of preferences and requirements. Factors such as fuel type, cost, and energy efficiency continue to influence consumer decisions in the market.
How Is Performance Evaluated in Outdoor Tankless Water Heaters?
Performance in outdoor tankless water heaters is evaluated through several key factors. First, flow rate measures the amount of hot water produced per minute. This value indicates how well the heater can meet demand. Second, temperature rise assesses how much the heater raises water temperature from its source temperature to the desired output. A higher temperature rise indicates better performance.
Efficiency ratings, such as the Energy Factor (EF), measure energy use relative to water heated. A higher EF signifies greater efficiency and lower energy costs. Another crucial aspect is installation and venting requirements. Proper installation impacts the heater’s performance significantly. Lastly, warranty length and customer service response times are indicators of the manufacturer’s confidence in their product’s reliability and performance.
Evaluating these components helps consumers understand how effectively a particular outdoor tankless water heater will function in real-life situations.
How Do Energy Efficiency Ratings Compare Among Outdoor Tankless Water Heaters?
Energy efficiency ratings among outdoor tankless water heaters can vary significantly based on the model and manufacturer. The following table compares some popular models based on their energy efficiency ratings, measured by their Energy Factor (EF) and Uniform Energy Factor (UEF). These ratings reflect the efficiency of the water heaters in converting energy into hot water.
| Model | Energy Factor (EF) | Uniform Energy Factor (UEF) | Type of Fuel | Warranty (Years) |
|---|---|---|---|---|
| Rinnai RUR199iN | 0.93 | 0.96 | Natural Gas | 12 |
| EcoSmart ECO 27 | 0.97 | N/A | Electric | 1 |
| Takagi T-H3-DV-N | 0.95 | 0.95 | Natural Gas | 15 |
| Noritz NRC661-DV-NG | 0.94 | 0.94 | Natural Gas | 12 |
These ratings illustrate the relative efficiency of each model, helping consumers make informed decisions based on their energy usage needs.
Related Post: