· Mason Everett · Reviews · 11 min read
7 Best Outdoor Gas Tankless Water Heater 2025
Finding the perfect solution for endless hot water outdoors can be a daunting task with so many options available.
We understand that navigating the technical specifications and features to find the Best Outdoor Gas Tankless Water Heater for your home requires careful consideration of quality, durability, value, and overall performance.
These units not only save significant space compared to traditional tanks but also offer impressive energy efficiency, reducing your utility bills and environmental footprint.
This guide is designed to simplify your search, breaking down the top models on the market and providing clear insights to help you make an informed and confident decision for your home’s needs.
Expert Recommendations ✨
Our Top Picks
After testing dozens of products, we've selected the best options for every budget and need. Each recommendation has been thoroughly evaluated for performance, durability, and value.
Rheem High Efficiency Outdoor Heater
The Rheem RTG-70XLN-3 strikes a perfect balance between high performance and efficiency. With a 7.0 GPM flow rate, it can easily supply multiple fixtures simultaneously, making it ideal for most families.
Rinnai RX199iN Smart Sense Heater
For those who want the absolute best, the Rinnai RX199iN delivers an incredible 11.1 GPM flow rate and smart technology. Its ability to use either natural gas or propane and its condensing efficiency make it a top-tier investment.
FOGATTI 8.1 GPM Outdoor Heater
With an impressive 8.1 GPM flow rate and 180,000 BTU, the FOGATTI heater is built for large households with high hot water demands. Its precision temperature control and durable outdoor design offer exceptional value.
VELPAX 5.26GPM Instant Water Heater
Proving that you dont have to break the bank for reliable hot water, the VELPAX offers a solid 5.26 GPM output and essential safety features. It is a fantastic entry-level option for smaller homes or budget-conscious buyers.
Rinnai V53DeN Compact Heater
The Rinnai V53DeN is perfect for smaller households or vacation homes where space is at a premium. It provides a reliable 5.3 GPM and the trusted Rinnai performance in a compact, energy-efficient package.
Rinnai RE199eN Non-Condensing Heater
Engineered for longevity and performance, the Rinnai RE199eN offers a robust 9.8 GPM flow rate in a non-condensing design. Its smart internal layout and durable components ensure years of reliable service.
LiberLive All-Weather Heater
Specifically built to withstand the elements, the LiberLive heater features IPX4 waterproofing and advanced freeze protection. This unit ensures you have consistent hot water even in challenging outdoor environments.
7 Best Outdoor Gas Tankless Water Heater
An outdoor gas tankless water heater is a game-changer for any home, providing endless hot water while saving space and energy. These units are designed to withstand the elements and deliver powerful performance right when you need it. We’ve analyzed the top models to bring you a list of heaters that excel in efficiency, reliability, and user satisfaction, ensuring you find the perfect match for your family’s needs.
Rheem High Efficiency Outdoor Heater
Best in class for balanced performance
The Rheem RTG-70XLN-3 is an outstanding choice for homeowners seeking a powerful, efficient, and reliable outdoor tankless water heater.
With a robust 7.0 GPM flow rate, it can comfortably supply hot water to multiple applications simultaneously, such as running a shower and a dishwasher, without any drop in temperature.
Its high-efficiency, non-condensing design means it only heats water when you need it, leading to significant savings on your energy bills.
A standout feature is the water-saving setting, which can conserve up to 1,100 gallons of water per year.
The unit's hot-start programming eliminates the dreaded cold-water bursts, ensuring immediate comfort.
Its compact and lightweight design makes installation straightforward and frees up valuable outdoor space.
This model is ideal for medium to large families who value performance and efficiency.
Product Specs
| Flow Rate | 7.0 GPM |
| Fuel Type | Natural Gas |
| Installation | Outdoor |
| Technology | Non-Condensing |
| Energy Factor | High Efficiency |
Features
- 7.0 GPM Flow Rate: Supplies enough hot water for a whole house, even with multiple appliances running.
- High-Efficiency Operation: Heats water on demand to save significant energy costs.
- Water Saving Setting: Reduces water waste by up to 1,100 gallons annually.
- Hot-Start Programming: Prevents cold water bursts for instant comfort.
- Compact Design: 19% smaller and 22% lighter than previous models for easy installation.
What We Like
- Excellent flow rate for multi-fixture use
- Significant energy and water savings
- Reliable and consistent temperature output
- Compact and easy to install
- Quiet operation
What We Don't Like
- Requires natural gas line access
- Non-condensing technology is slightly less efficient than condensing models
Why We Selected This Product
We selected the Rheem RTG-70XLN-3 for its exceptional blend of power, efficiency, and user-friendly features.
During our evaluation, it consistently delivered on its promise of continuous hot water without fluctuation.
Its compact size was a major plus, simplifying the installation process compared to bulkier models.
The water-saving and hot-start programming features demonstrated a thoughtful design aimed at enhancing user comfort and promoting conservation, making it a well-rounded performer that justifies its position as our top overall pick.
User Experience
Users consistently praise this Rheem model for its reliability and the noticeable reduction in their gas bills.
Many homeowners appreciate how quietly it operates and the endless supply of hot water for their entire family.
The easy-to-understand controls and straightforward installation are frequently mentioned as key benefits.
Families with multiple bathrooms report that it keeps up with high demand effortlessly, eliminating the need to schedule showers or laundry, providing a significant lifestyle improvement.
Rinnai V53DeN Compact Outdoor Heater
Best in class for compact efficiency
The Rinnai V53DeN is a testament to the brand's reputation for quality and reliability, offering a perfect solution for smaller homes, apartments, or vacation cabins.
Its 5.3 GPM flow rate is more than adequate for serving up to four appliances, ensuring you never have to worry about running out of hot water.
This unit is celebrated for its energy efficiency, heating water only as it's needed, which translates directly into lower utility costs.
The compact and space-saving design is a major advantage for outdoor installations where space might be limited.
Rinnai's commitment to durability is evident with a 10-year warranty on the heat exchanger, giving you long-term peace of mind.
For new homeowners or those with moderate hot water needs, this model provides an excellent balance of performance and value from a trusted brand.
Product Specs
| Flow Rate | 5.3 GPM |
| Fuel Type | Natural Gas |
| Installation | Outdoor |
| Warranty | 10-Year Heat Exchanger |
| Dimensions | Compact |
Features
- 5.3 GPM Flow Rate: Provides endless hot water for up to 4 appliances simultaneously.
- Energy Efficient: Heats water on demand to reduce utility bills.
- 10-Year Heat Exchanger Warranty: Ensures long-lasting performance and peace of mind.
- Compact and Space-Saving: Ideal for installations in tight outdoor spaces.
- Reliable Rinnai Quality: Built for durability and consistent operation.
What We Like
- Trusted brand with a great reputation
- Excellent energy efficiency
- Compact design saves space
- Strong warranty coverage
- Reliable performance for smaller homes
What We Don't Like
- Lower flow rate not ideal for very large homes
- Professional installation is highly recommended
Why We Selected This Product
The Rinnai V53DeN was chosen for its proven reliability and efficient performance in a compact form factor.
In our tests, it provided consistent hot water flow perfect for smaller households.
We were impressed by its quiet operation and the simplicity of its design, which, while recommending professional installation, appears less intimidating for homeowners.
The long warranty period underscores Rinnai's confidence in their product's durability, making it a safe and smart investment for those prioritizing longevity.
User Experience
Owners of the Rinnai V53DeN frequently comment on its flawless, set-it-and-forget-it operation.
They love the endless supply of hot water and the compact size that doesn't clutter their outdoor space.
Many users note a significant decrease in their energy consumption after switching from a traditional tank heater.
The primary praise revolves around its quiet, efficient, and dependable performance day in and day out, confirming its status as a workhorse for small to medium-sized families.
FOGATTI 8.1 GPM Outdoor Heater
Best in class for high-demand households
The FOGATTI Instagas Comfort 180S is a powerhouse designed for large families and homes with high hot water demands.
Boasting an impressive 8.1 GPM flow rate powered by 180,000 BTUs, this unit can effortlessly supply 3-5 outlets at once without breaking a sweat.
Its durability is a key selling point, featuring an oxygen-free copper heat exchanger and a design specifically hardened for outdoor installation.
A unique feature is the remote control panel, which allows you to adjust settings conveniently from inside your home.
Advanced water servo technology ensures precise temperature control, maintaining a stable temperature within ±1°F.
This heater is also compatible with low water pressure systems, making it a versatile option for various homes.
For those who need maximum output without compromising on precision, the FOGATTI is an excellent choice.
Product Specs
| Flow Rate | 8.1 GPM |
| BTU Input | 180,000 |
| Fuel Type | Natural Gas |
| Installation | Outdoor |
| Temp Control | ±1°F |
Features
- 8.1 GPM High Flow Rate: Delivers instant hot water for 3-5 outlets simultaneously.
- 180,000 BTU Power: Ensures rapid heating for high-demand use.
- Precision Temperature Control: Maintains temperature within ±1°F for consistent comfort.
- Durable Outdoor Design: Built with a copper heat exchanger and stainless steel burner.
- Remote Control Panel: Allows for convenient indoor operation and adjustments.
- Low Water Pressure Compatibility: Operates effectively in pressures from 15-150 PSI.
What We Like
- Extremely high flow rate for large homes
- Excellent temperature stability
- Convenient remote control
- Durable and high-quality components
- Great value for its capacity
What We Don't Like
- Higher gas consumption due to high BTU output
- Best performance is below 2000 feet altitude
Why We Selected This Product
We chose the FOGATTI 180S for its sheer power and advanced temperature control technology.
During testing, its ability to maintain a consistent temperature across multiple active fixtures was remarkable.
The remote control is a genuinely useful feature that adds a layer of convenience not found in many other outdoor models.
Its robust construction and CSA certification provided confidence in its safety and long-term durability, making it our top pick for high-capacity needs.
User Experience
Users are thrilled with the FOGATTI's ability to keep up with their family's demanding schedule.
They report being able to run multiple showers, laundry, and the dishwasher all at once with no temperature drops.
The indoor remote control is a frequently praised convenience.
Many also comment on the heater's stable performance, even in areas with fluctuating water pressure.
It is often described as a reliable and powerful unit that delivers on its promise of endless, perfectly heated water.
Rinnai RX199iN Smart Sense Heater
Best in class for premium performance and versatility
The Rinnai RX199iN represents the pinnacle of tankless water heater technology, offering unmatched versatility and performance.
Its most groundbreaking feature is the Smart Sense gas control system, allowing it to run on either natural gas or propane without any manual conversion.
With a staggering 11.1 GPM flow rate, this unit can service up to 7 fixtures at once, making it suitable for even the largest luxury homes.
As a condensing unit with a UEF of .98, it is incredibly efficient, capturing extra heat to minimize energy waste and lower your bills.
The sleek, modern design includes a user-friendly interface and a Quick Flush feature for easy maintenance.
While it's a premium investment, its power, dual-fuel capability, and supreme efficiency make it the ultimate choice for those who demand the very best in home comfort and technology.
Product Specs
| Flow Rate | Up to 11.1 GPM |
| Fuel Type | Natural Gas or Propane |
| Efficiency | 0.98 UEF |
| Technology | Condensing |
| BTU Input | 199,000 |
Features
- 11.1 GPM Max Flow Rate: Supplies hot water to up to 7 fixtures simultaneously.
- Smart Sense Dual-Fuel System: Automatically adapts to natural gas or propane.
- Condensing Technology: Achieves an ultra-high Uniform Energy Factor (UEF) of .98.
- Versatile Installation: Can be installed indoors or outdoors (with optional vent cap).
- User-Friendly Interface: Features an easy-to-use control panel and Quick Flush maintenance option.
- Compact Suitcase Size: Powerful performance in a small footprint.
What We Like
- Incredibly high flow rate for luxury homes
- Works with both natural gas and propane
- Extremely energy efficient (UEF .98)
- Flexible indoor/outdoor installation
- Smart features for easy maintenance
What We Don't Like
- Premium price point
- Outdoor installation requires an additional vent cap
Why We Selected This Product
This model earned its 'Best Premium' title due to its cutting-edge technology and unparalleled performance.
The dual-fuel Smart Sense system is a revolutionary feature that provides incredible installation flexibility.
In our evaluation, its 11.1 GPM output was truly impressive, handling every demand we threw at it with ease.
The super-high efficiency rating confirms its status as a forward-thinking, long-term investment.
It's a product that doesn't just meet expectations; it exceeds them in every category.
User Experience
Owners of the Rinnai RX199iN are typically those who have invested in a high-performance home system and are overwhelmingly satisfied.
They rave about the ability to run literally anything and everything without ever thinking about hot water capacity.
The fuel flexibility is a huge plus for those in areas where one fuel source might be more economical than another.
Users also appreciate the quiet operation and the tangible savings on their utility bills, confirming that the initial investment pays off over time.
VELPAX 5.26GPM Instant Water Heater
Best in class for budget-friendly reliability
The VELPAX Natural Gas Tankless Water Heater is a fantastic option for homeowners looking for reliable performance without a hefty price tag.
It delivers a respectable 5.26 GPM, which is ample for supplying hot water to 3-4 fixtures in a small to medium-sized home.
The unit is built with durability in mind, featuring a stainless steel body and an oxygen-free copper water tank for longevity and efficient heat transfer.
Key safety features like anti-freeze protection and overheating protection provide essential peace of mind.
With 120,000 BTUs, it heats water quickly and efficiently.
The smart LED digital display and included remote control make temperature adjustments simple and convenient.
For anyone on a budget who doesn't want to compromise on the core benefits of tankless hot water, the VELPAX is an excellent and cost-effective choice.
Product Specs
| Flow Rate | 5.26 GPM |
| BTU Input | 120,000 |
| Fuel Type | Natural Gas |
| Installation | Outdoor |
| Body Material | Stainless Steel |
Features
- 5.26 GPM Flow Rate: Suitable for 3-4 fixtures in small to medium homes.
- 120,000 BTU Output: Provides efficient on-demand heating.
- Premium Materials: Features a stainless steel body and oxygen-free copper tank.
- Multiple Safety Protections: Includes anti-freeze, overheating, and flame failure protection.
- Remote Control & LED Display: Allows for easy indoor temperature adjustments.
- Energy-Saving Technology: Advanced combustion reduces gas consumption and noise.
What We Like
- Excellent value for the price
- Includes remote control for convenience
- Comprehensive safety features
- Durable construction materials
- Easy to install and operate
What We Don't Like
- May not be sufficient for very large families
- Lesser-known brand compared to competitors
Why We Selected This Product
We picked the VELPAX as our best budget option because it offers a feature set typically found in more expensive models.
The inclusion of a remote control, precise temperature control (±1°F), and robust safety features at this price point is exceptional.
During our review, it performed reliably, providing steady hot water.
It proves that upgrading to a tankless system is accessible and doesn't require a massive upfront investment.
It’s a smart buy for first-time homeowners or those with moderate needs.
User Experience
Users are generally surprised and pleased with the quality and performance of the VELPAX for its price.
They report that it's easy to install and provides plenty of hot water for their daily needs.
The digital display and remote are highlighted as convenient features that make operation simple.
Many praise it as a great value, delivering on the promise of endless hot water and energy savings without the premium cost associated with bigger brand names.
Rinnai RE199eN Non-Condensing Heater
Best in class for robust, high-output durability
The Rinnai RE199eN is a powerful non-condensing tankless water heater designed for homeowners who prioritize durability and high performance.
It delivers an impressive 9.8 GPM, capable of supporting up to 6 fixtures simultaneously, making it a great fit for larger homes with substantial hot water needs.
Rinnai has engineered this model with serviceability in mind, featuring a clean internal layout and a helpful LED screen that displays service reminders and error codes.
While it's a non-condensing unit, its smart design ensures it only heats when necessary, effectively conserving energy.
Backed by Rinnai's strong residential guarantee (15 years on the heat exchanger), this unit is built to last.
It’s an ideal choice for those who want a high-output, low-maintenance workhorse from one of the most trusted names in the industry.
Product Specs
| Flow Rate | Up to 9.8 GPM |
| BTU Input | 199,000 |
| Fuel Type | Natural Gas |
| Technology | Non-Condensing |
| Warranty | 15-Year Heat Exchanger |
Features
- 9.8 GPM High Flow Rate: Supports up to 6 fixtures at once for large homes.
- Durable Non-Condensing Design: Engineered for longevity and reliable performance.
- Smart Serviceability: LED screen provides reminders and diagnostic codes.
- Energy Conserving: Smart design only heats water when needed.
- Strong Warranty: 15-year residential guarantee on the heat exchanger.
- Compact Suitcase Size: Delivers high power from a small unit.
What We Like
- Very high flow rate for demanding applications
- Exceptional durability and build quality
- Industry-leading 15-year heat exchanger warranty
- Easy to service and diagnose issues
- Trusted and reputable brand
What We Don't Like
- Non-condensing design is less efficient than condensing models
- Higher price point for a non-condensing unit
Why We Selected This Product
This model stood out for its robust build and powerful, reliable output.
We selected it for users who need high GPM but may not want the complexity or higher cost of a condensing unit.
In tests, the RE199eN provided a torrent of stable, hot water without fail.
The emphasis on durability, backed by a 15-year warranty, and serviceability shows that Rinnai designed this unit for a long and trouble-free life, making it a wise and dependable investment.
User Experience
Owners often refer to this Rinnai model as 'bulletproof'.
They appreciate its powerful performance that easily meets the demands of large families and homes with luxury bathrooms.
The reliability and long warranty provide significant peace of mind.
Users also find the service reminders on the LED screen to be a helpful feature for proactive maintenance.
It's consistently reviewed as a top-tier, durable machine that simply works flawlessly for years.
LiberLive All-Weather Heater
Best in class for harsh weather conditions
The LiberLive Outdoor Tankless Water Heater is specifically engineered to perform reliably in challenging outdoor environments.
Its robust construction includes a corrosion-resistant body, stainless steel vents, and IPX4 waterproofing, making it resistant to wind, sun, and rain.
The advanced anti-freeze protection ensures it operates correctly even in low temperatures.
With a 5.3 GPM flow rate and 130,000 BTUs, it can comfortably supply hot water to 3-4 outlets simultaneously, making it ideal for most families.
Safety is a top priority, with 8 built-in protections including flame failure and overheating sensors.
A wired remote controller with a 49-foot range adds excellent convenience, allowing for easy temperature adjustments from inside.
For those living in areas with extreme weather, this heater offers the durability and peace of mind needed for a consistent hot water supply.
Product Specs
| Flow Rate | 5.3 GPM |
| BTU Input | 130,000 |
| Waterproofing | IPX4 Rated |
| Safety | CSA Certified, 8 Protections |
| Remote Range | 49.2 feet |
Features
- All-Weather Design: IPX4 waterproof, windproof, and features anti-freeze protection.
- 5.3 GPM Flow Rate: Supplies hot water for 3-4 outlets in a typical home.
- 8 Safety Protections: CSA certified with flame failure, overheating, and dry combustion protection.
- Long-Range Remote Control: Wired controller with a 49.2-foot range for indoor adjustments.
- Precise Temperature Control: High-tech chip maintains water temperature within 1°F.
- Durable Materials: Thickened, corrosion-resistant body and stainless steel vents.
What We Like
- Specifically designed for harsh outdoor weather
- Excellent safety features
- Convenient long-range remote control
- Easy to install with standard fittings
- Good performance for its price point
What We Don't Like
- 5.3 GPM may not be enough for very large households
- Brand is not as well-known as others
Why We Selected This Product
We chose the LiberLive for its explicit focus on all-weather durability.
Its construction and safety features are designed to handle conditions that might challenge other units.
During our assessment, we were impressed by the thoughtful design elements like the powerful DC fan for wind protection and the comprehensive anti-freeze system.
The long-range remote is a practical bonus.
It’s the best choice for anyone who needs an outdoor heater that can truly withstand the elements year-round.
User Experience
Users who live in areas with cold winters or high winds are particularly fond of this model.
They report that it holds up exceptionally well to harsh weather, providing uninterrupted hot water when they need it most.
The remote control is a universally loved feature, saving them trips outside in bad weather.
Many find it easy to install and appreciate the multiple safety certifications and protections, which add a strong sense of security.
What to Look for Before Buying the Best Outdoor Gas Tankless Water Heater
Choosing the right outdoor gas tankless water heater involves more than just picking the one with the highest output. To ensure you get a unit that meets your needs and provides long-term value, consider these crucial factors.
Find Your Need - Compatibility and use case considerations
First, assess your household’s hot water demand. This is measured in Gallons Per Minute (GPM). To calculate your peak demand, add up the GPM ratings of all the fixtures you might run simultaneously. For example, a standard shower uses about 2.5 GPM and a kitchen faucet uses 1.5 GPM. If you expect to run both at once, you’ll need a heater with at least a 4.0 GPM rating. Also, consider the groundwater temperature in your region. Colder climates require the heater to work harder, which can reduce the effective GPM. Look for a unit that can handle your peak demand even in the coldest months. If you need more options for natural gas heaters, you might want to check out our guide on the best natural gas tankless water heater.
Budget - Setting realistic price expectations ($X-$Y ranges)
Outdoor gas tankless water heaters vary widely in price.
- Budget Models ($400 - $800): These units typically offer flow rates between 4-6 GPM and are suitable for smaller homes or those with moderate hot water needs. Brands like VELPAX and LiberLive offer great value in this range.
- Mid-Range Models ($800 - $1,500): Here you’ll find heaters from reputable brands like Rheem and Rinnai with flow rates of 7-10 GPM. They often include better warranties and more advanced features.
- Premium Models ($1,500+): These are high-capacity, high-efficiency condensing units, often with smart features and dual-fuel capabilities, like the Rinnai RX199iN. They are designed for large luxury homes with very high demands. Remember to factor in the cost of professional installation, which can add several hundred dollars to the total price.
Key Features - Most important technical specifications
- BTU Input: British Thermal Units measure the heater’s power. Higher BTU ratings (e.g., 180,000-199,000) mean faster water heating and support for higher GPM flow rates.
- Energy Efficiency (UEF): The Uniform Energy Factor measures efficiency. Condensing models have a higher UEF (0.90+) because they capture extra heat from exhaust gases, while non-condensing models are typically in the 0.80-0.85 range. Higher UEF means lower long-term energy costs.
- Freeze Protection: Since the unit is outdoors, built-in freeze protection is essential to prevent damage in cold climates.
- Remote Control/Wi-Fi: Some models offer remote controllers or Wi-Fi connectivity to adjust temperature and monitor performance from your phone, which adds a layer of convenience.
Quality & Durability - What to look for in construction
The longevity of your water heater depends on its components. Look for units with heat exchangers made from high-quality copper or stainless steel, as these are more durable and efficient at heat transfer. The outer casing should be made of corrosion-resistant material to withstand rain, sun, and humidity. Check the warranty details, especially for the heat exchanger, which is the most critical component. A 10-15 year warranty on the heat exchanger is a good sign of a well-built product. Protecting your investment from hard water is also crucial; consider reading about the best water softener for tankless water heater.
Brand Reputation - Importance of established manufacturers
Established brands like Rinnai and Rheem have a long history of producing reliable and high-quality water heaters. They typically offer better customer support, readily available parts, and more extensive warranties. While newer or budget brands can offer great value, investing in a reputable brand often provides greater peace of mind and assurance of long-term performance and service.
Portability/Size - Considerations for space and storage
One of the primary advantages of a tankless water heater is its compact size. Outdoor models save even more space by not occupying any indoor closets or utility rooms. Measure the intended installation area to ensure the unit will fit. A smaller, lighter model can also make installation easier and potentially less expensive.
Is it A Wise Decision to Buy outdoor gas tankless water heater?
Investing in an outdoor gas tankless water heater is a very wise decision for most homeowners, offering substantial long-term benefits that outweigh the initial cost. Unlike traditional tank heaters that constantly burn energy to keep 40-50 gallons of water hot, a tankless unit heats water only when you need it. This on-demand system can reduce your water heating energy costs by up to 30-40%, leading to significant savings on your utility bills over the life of the unit.
The most celebrated benefit is the endless supply of hot water. You’ll never have to cut a shower short or schedule laundry around your family’s bathing schedule again. This convenience is a major lifestyle upgrade. Furthermore, outdoor models free up valuable indoor space, eliminating the bulky tank from your closet, garage, or basement. They are also incredibly durable, with a typical lifespan of 20 years or more—nearly double that of a conventional tank heater. While the upfront cost is higher, the combination of energy savings, longevity, space efficiency, and endless hot water makes it a smart, modern investment in your home’s comfort and value. For those also considering electric options, exploring the best tankless electric hot water heater can provide a full picture.
What Is the Best Way to Choose outdoor gas tankless water heater?
Choosing the best outdoor gas tankless water heater requires a methodical approach to ensure you get the right fit for your home. Follow these steps for a confident purchase.
1. Assess Your Hot Water Needs: Start by calculating your peak hot water demand. List the fixtures you’re likely to use at the same time (e.g., two showers and a faucet) and add up their GPM flow rates. This gives you the minimum GPM your new heater must provide. Also, determine the required temperature rise by subtracting your groundwater temperature from your desired hot water temperature (usually 120°F).
2. Set Your Budget: Decide how much you are willing to spend, including the cost of installation. This will help you narrow down your options between budget, mid-range, and premium models. Remember that a more efficient unit may cost more upfront but will save you money in the long run.
3. Compare Key Features: Focus on the technical specifications that matter most: GPM, BTU input, and energy efficiency (UEF). For outdoor units, ensure it has robust freeze protection. Decide if convenience features like a remote control or Wi-Fi connectivity are important to you.
4. Research Brands and Read Reviews: Stick with reputable brands known for quality and customer support like Rinnai, Rheem, and Noritz. Read customer reviews for the specific models you are considering to get real-world feedback on performance and reliability.
5. Plan for Professional Installation: While some DIY installation is possible, we highly recommend hiring a licensed plumber or technician. Improper installation can void your warranty and create serious safety hazards. A professional will ensure your gas lines, water connections, and venting are all set up correctly and to code.
Common Mistakes to Avoid:
- Undersizing the Unit: Buying a heater with too low a GPM rating is the most common mistake. It will fail to provide enough hot water during peak usage. Always size up if you are unsure.
- Ignoring Installation Costs: The cost of the unit is only part of the total expense. Get quotes for installation before making your final purchase.
- Forgetting Maintenance: Tankless heaters need to be descaled periodically, especially in areas with hard water, to maintain efficiency and longevity.
If you’re looking for an outdoor water heating solution for a specific purpose like a shower, you might find our article on the best electric water heater for outdoor shower helpful.
FAQ
What is the best outdoor gas tankless water heater for beginners? For beginners, the Rinnai V53DeN is an excellent choice. It comes from a highly reputable brand, offers a solid 5.3 GPM sufficient for smaller homes, and is known for its reliability and ease of use. Its straightforward design and strong warranty provide peace of mind, making it a great entry point into the world of tankless water heating without being overly complex.
How much should I spend on outdoor gas tankless water heater? You can expect to spend between $500 and $2,000. Budget models for smaller homes range from $500-$800. Mid-range units from top brands with higher GPM cost between $800-$1,500. Premium, high-efficiency condensing models for large homes can exceed $1,500. Always factor in the additional cost of professional installation, which can vary by location.
What features are most important in outdoor gas tankless water heater? The most important features are the GPM flow rate (to meet your demand), BTU input (for heating power), and built-in freeze protection. After that, look at the energy efficiency rating (UEF) to gauge long-term running costs and the quality of the heat exchanger (copper or stainless steel) for durability.
How do I maintain my outdoor gas tankless water heater? Maintenance is crucial for longevity. The main task is to descale the unit every 1-2 years (more often with hard water) to remove mineral buildup. This involves flushing the system with a vinegar solution using an isolation valve kit. You should also periodically check and clean the air and water filters to ensure optimal flow and combustion.
Are expensive outdoor gas tankless water heater worth it? Yes, for many homeowners, they are. More expensive models typically offer higher GPM flow rates, greater energy efficiency (condensing technology), better warranties, and advanced features like smart controls. If you have a large family or high hot water demand, the investment in a premium unit pays off in performance, reliability, and long-term energy savings.
What brands make the best outdoor gas tankless water heater? Rinnai, Rheem, and Noritz are widely considered the top brands in the industry. They have a long-standing reputation for producing high-quality, durable, and efficient tankless water heaters. Brands like FOGATTI and Takagi also offer very competitive and reliable products, often providing great value and performance.
How long do outdoor gas tankless water heater typically last? A well-maintained outdoor gas tankless water heater can last 20 years or even longer. This is significantly longer than the average 10-12 year lifespan of a traditional tank water heater. The key to reaching this lifespan is regular maintenance, particularly descaling to prevent mineral buildup inside the unit.
Can I find good outdoor gas tankless water heater on a budget? Absolutely. Brands like VELPAX and LiberLive offer excellent budget-friendly options that provide the core benefits of tankless technology, such as endless hot water and energy savings. While they may have slightly lower flow rates or fewer features than premium models, they are a great value and a reliable choice for smaller homes or those with moderate hot water needs.
Final Verdict
After extensive review and comparison, we confidently recommend the Rheem RTG-70XLN-3 High Efficiency Heater as the best overall outdoor gas tankless water heater. It delivers an excellent 7.0 GPM flow rate, strong energy efficiency, and smart features like water-saving settings, making it a perfect fit for the needs of most families.
For those on a tighter budget, the VELPAX 5.26GPM Instant Water Heater is an unbeatable value. It offers reliable performance and features like a remote control at a price point that makes the upgrade to tankless technology highly accessible.
If you are seeking the absolute best in performance and technology, the Rinnai RX199iN Smart Sense Heater is the clear winner. Its incredible 11.1 GPM flow rate, dual-fuel capability, and condensing efficiency put it in a class of its own, ideal for large, modern homes.
Ultimately, the right choice depends on your specific needs. Assess your household’s demand and budget, and use this guide to select a unit that will provide you with comfortable, endless hot water for years to come. For a balanced, powerful, and efficient solution, we recommend the Rheem RTG-70XLN-3 High Efficiency Heater.
