· Mason Everett · Reviews · 11 min read
9 Best Outdoor Tankless Water Heater Natural Gas 2025
Finding the perfect solution for your home’s hot water needs can feel overwhelming, especially with so many options on the market.
When it comes to efficiency and convenience, choosing the Best Outdoor Tankless Water Heater Natural Gas is a smart move for any homeowner.
We’ve meticulously evaluated numerous models based on critical criteria such as performance, durability, overall value, and energy efficiency.
This guide dives deep into the top contenders, focusing on eco-friendly units that deliver consistent hot water while ensuring safety and reliability.
Our goal is to provide you with all the information you need to make a confident and informed decision for your home.
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 Tankless Heater
With a powerful 7.0 GPM flow rate and water-saving technology, this Rheem model offers an exceptional balance of performance, efficiency, and reliability for most households.
Rinnai RX199iN Smart Sense Heater
This is the ultimate high-capacity solution, delivering an incredible 11.1 GPM. Its Smart Sense technology adapts to natural gas or propane, making it incredibly versatile and powerful.
FOGATTI 5.1 GPM Instant Hot Heater
Offering 120,000 BTUs and a solid 5.1 GPM flow rate, the Fogatti heater provides excellent performance and precise temperature control at a very competitive price point.
Rinnai V53DeN 5.3 GPM Heater
A reliable and compact unit from a trusted brand, this Rinnai model is perfect for smaller homes or families, providing endless hot water with proven durability and a great warranty.
Rinnai RE199eN 9.8 GPM Heater
For large households with high demand, this non-condensing Rinnai model is a powerhouse. It delivers up to 9.8 GPM to run multiple fixtures simultaneously without a drop in pressure.
LiberLive 5.3 GPM Outdoor Heater
Built to withstand the elements, this LiberLive heater features robust IPX4 waterproofing, freeze protection, and an anti-corrosion body, ensuring reliable performance in any weather.
Orbek 5.1 GPM Outdoor Heater
Engineered to handle extreme weather, this Orbek model boasts IPX4 waterproofing and can withstand strong winds. Its oxygen-free copper heat exchanger ensures efficiency and longevity.
VELPAX 5.26 GPM Tankless Heater
This unit provides an impressive 5.26 GPM flow rate and 120,000 BTU output at an affordable price. It includes a remote control and multiple safety features, making it a great entry-level choice.
Rinnai RE140eN 5.3 GPM Heater
Ideal for medium-sized homes, this Rinnai model combines efficiency with a durable design. It provides a steady 5.3 GPM, ensuring reliable, on-demand hot water for everyday needs.
9 Best Outdoor Tankless Water Heater Natural Gas
Say goodbye to scheduling showers and hello to endless, on-demand hot water. These outdoor tankless water heaters are not just about convenience; they’re about upgrading your home’s efficiency, saving space, and reducing your energy bills. We’ve selected the top 9 models that stand out for their robust performance, innovative features, and unwavering reliability, ensuring there’s a perfect match for every home and budget.
Rheem High Efficiency Tankless Heater
Best for Overall Performance and Efficiency
The Rheem RTG-70XLN-3 is a powerhouse of efficiency and convenience, perfectly suited for medium to large families.
With a substantial 7.0 GPM flow rate, it can easily handle multiple hot water demands simultaneously, like running a shower and a dishwasher, without any temperature drops.
Its high-efficiency, non-condensing design means it only heats water when you need it, leading to significant savings on your natural gas bill.
We were particularly impressed with its Water Saving Setting, which can conserve up to 1,100 gallons of water per year by reducing flow at the tap until the set temperature is achieved.
The hot-start programming is another standout feature, eliminating the dreaded cold-water blast common with older tankless models.
This unit is ideal for homeowners seeking a reliable, eco-conscious, and high-performing water heating solution.
Product Specs
| Flow Rate | 7.0 GPM |
| Gas Type | Natural Gas |
| Installation | Outdoor, Non-Condensing |
| Energy Factor | ~0.82 UEF |
| Dimensions | 23.6" x 14" x 9.8" |
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 significantly lower energy consumption.
- Water Saving Setting: Reduces water waste by up to 1,100 gallons annually.
- Hot-Start Programming: Minimizes wait time and prevents bursts of cold water.
- Compact and Lightweight: 19% smaller and 22% lighter than previous models for easier installation.
What We Like
- Excellent flow rate for large families
- Noticeable energy and water savings
- Reliable and consistent temperature output
- Compact design saves valuable outdoor space
- Trusted brand with a strong reputation
What We Don't Like
- Non-condensing design is slightly less efficient than condensing models
- May require professional installation for warranty validity
Why We Selected This Product
We selected the Rheem RTG-70XLN-3 as our top overall pick after extensive testing highlighted its superior balance of power, efficiency, and user-friendly features.
It consistently delivered hot water faster than many competitors, and its compact, space-saving design makes installation straightforward.
The combination of its high GPM, energy-saving capabilities, and trusted brand reputation makes it an unbeatable value for most households.
User Experience
Users consistently praise this Rheem model for its quiet operation and the endless supply of hot water it provides.
Many have noted a noticeable decrease in their energy bills after making the switch.
The compact design is frequently mentioned as a major plus, freeing up valuable space where a bulky tank heater used to be.
The simple installation process is another common point of positive feedback, although professional installation is always recommended.
Rinnai V53DeN Outdoor Tankless Heater
Best for Reliability in Small Homes
The Rinnai V53DeN is a testament to the brand's reputation for quality and durability, making it an excellent choice for smaller households, apartments, or condos.
It delivers a steady 5.3 GPM, which is ample for running up to four fixtures simultaneously, ensuring you never run out of hot water during your morning routine.
This model is designed specifically for outdoor installation, freeing up interior space and simplifying venting requirements.
Its energy-efficient nature means it only consumes gas when hot water is flowing, translating to lower utility costs and a smaller environmental footprint.
For new homeowners or those looking to upgrade from a traditional tank heater, the Rinnai V53DeN provides a reliable, long-lasting solution backed by an impressive 10-year warranty on the heat exchanger.
Product Specs
| Flow Rate | 5.3 GPM |
| Gas Type | Natural Gas |
| BTU Input | 120,000 |
| Installation | Outdoor |
| Dimensions | 21.5" x 14" x 7" |
Features
- 5.3 GPM Flow Rate: Ideal for small to medium-sized families, supporting up to 4 appliances.
- Energy-Efficient: Heats water on demand, reducing energy waste and lowering bills.
- 10-Year Heat Exchanger Warranty: Provides long-term peace of mind and performance.
- Compact Outdoor Design: Saves indoor space and simplifies installation.
- User-Friendly Operation: Simple to use and maintain for hassle-free hot water.
What We Like
- Extremely reliable and durable
- Excellent warranty from a top-tier brand
- Compact and space-saving
- Energy efficient performance
- Easy to operate
What We Don't Like
- Lower GPM may not be suitable for very large homes
- Professional installation is strongly recommended
Why We Selected This Product
We chose the Rinnai V53DeN for its proven reliability and straightforward, no-fuss performance.
In our evaluations, it provided consistent temperature control and operated flawlessly.
While it doesn't have the highest GPM on our list, its performance is perfectly matched for its intended use in smaller homes.
The compact, space-saving design combined with Rinnai's excellent warranty makes it a smart, worry-free investment.
User Experience
Owners of the Rinnai V53DeN often comment on its set-it-and-forget-it reliability.
They appreciate the compact size that fits discreetly on an exterior wall.
Many users report a smooth transition from old tank heaters, enjoying the newfound luxury of endless hot water.
The primary sentiment is one of confidence in the Rinnai brand and satisfaction with the heater's consistent performance day in and day out.
FOGATTI Natural Gas Tankless Water Heater
Best for Value and Precise Temperature
The FOGATTI Instagas Comfort 120S series offers an exceptional combination of performance and value, making it a standout choice for budget-conscious homeowners who don't want to compromise on quality.
It delivers a robust 120,000 BTU output and a 5.1 GPM flow rate, sufficient for supplying 2-4 outlets simultaneously in a medium-sized home.
What truly sets this model apart is its advanced water servo technology and multiple temperature sensors, which work together to maintain a water temperature fluctuation of less than ±1°F.
This ensures a remarkably stable and comfortable shower experience.
Its eco-efficient design keeps energy bills low, while the included remote control panel adds a layer of convenience for indoor operation.
With CSA certification and multiple built-in safety features, it provides reliable performance and peace of mind.
Product Specs
| Flow Rate | 5.1 GPM |
| BTU Input | 120,000 |
| Gas Type | Natural Gas |
| Installation | Outdoor |
| Dimensions | 23.9" x 15.5" x 7.3" |
| Water Pressure Range | 15-150 PSI |
Features
- 5.1 GPM & 120,000 BTU: Powerful performance for medium-sized families.
- Precision Temperature Control: Maintains temperature stability within ±1°F.
- Remote Control Panel: Allows for convenient temperature adjustments from indoors.
- High-Efficiency Copper Heat Exchanger: Ensures durability and excellent heat transfer.
- CSA Certified: Equipped with multiple safety features for secure operation.
- Anti-Freeze Protection: Active heating device protects the unit in cold weather.
What We Like
- Excellent value for the features offered
- Extremely stable water temperature
- Convenient remote control
- Energy-efficient and space-saving
- Comprehensive safety protections
What We Don't Like
- Not ideal for very high-demand households
- Requires draining if ambient temperature drops below 5°F for extended periods
Why We Selected This Product
The FOGATTI heater earned its spot on our list for its incredible value proposition.
It packs features like precise temperature control and a durable copper heat exchanger that are often found in more expensive models.
During our review, the temperature stability was noticeably better than other units in its price range.
It's a fantastic option for anyone looking to get the benefits of tankless heating without a hefty initial investment.
User Experience
Users are frequently impressed by the FOGATTI's performance for the price.
The stable water temperature is a highlight in many reviews, with people noting the end of sudden temperature changes in the shower.
The remote control is also a much-loved feature, allowing for easy adjustments without having to go outside.
Many report easy installation and appreciate the unit's quiet operation and compact form factor.
VELPAX 5.26GPM Outdoor Natural Gas Heater
Best for Budget-Friendly Performance
The VELPAX outdoor tankless water heater is a fantastic entry-level option that delivers impressive performance without breaking the bank.
It provides a generous 5.26 GPM flow rate powered by 120,000 BTUs, making it capable of handling the hot water needs of a typical family home with 3-4 fixtures.
The unit is built with durability in mind, featuring a stainless steel body and an oxygen-free copper water tank for longevity and efficient heating.
Its LED smart digital display and included remote control make temperature adjustments simple and precise, with a range from 95°F to 149°F.
Safety is also a priority, with anti-freeze, overheating, and flame failure protections built-in.
This heater is a solid choice for those seeking an efficient, reliable, and affordable upgrade to on-demand hot water.
Product Specs
| Flow Rate | 5.26 GPM |
| BTU Input | 120,000 |
| Gas Type | Natural Gas |
| Installation | Outdoor |
| Dimensions | 22.8" x 14.4" x 5.9" |
| Temp Range | 95°F - 149°F |
Features
- 5.26 GPM Flow Rate: Delivers on-demand hot water for 3-4 fixtures.
- 120,000 BTU Output: Powerful enough for whole-house use in most family homes.
- Stainless Steel & Copper Construction: Ensures durability and corrosion resistance.
- Remote Control & LED Display: Provides easy and precise temperature adjustments.
- Low Water Pressure Start: Operates with just 3.6 PSI, ideal for various homes.
- Multiple Safety Protections: Includes anti-freeze, overheating, and flame failure systems.
What We Like
- Great performance for a low price
- Includes a convenient remote control
- Durable materials for longevity
- Works well with low water pressure
- Easy-to-read digital display
What We Don't Like
- Brand is less established than competitors
- Temperature control may be slightly less precise than premium models
Why We Selected This Product
We were impressed by the VELPAX heater's feature set at its accessible price point.
It offers a slightly higher GPM than other budget models and includes a remote control, which is a great convenience.
Its low water pressure startup (3.6 PSI) is a significant advantage for homes with variable water pressure.
It performed reliably in our tests, delivering consistent hot water and proving itself to be a top contender in the budget category.
User Experience
Customers often highlight the excellent value of the VELPAX heater.
Many are surprised by its quiet operation and the quick delivery of hot water.
The digital display and remote are frequently praised for their ease of use.
Users in areas with lower water pressure have found this unit to be a perfect solution, as it functions reliably where other heaters might struggle.
It's often described as a simple, effective, and economical choice.
Rinnai RX199iN Smart Sense Tankless Heater
Best for Premium High-Capacity Demand
For those who demand the absolute best in performance and versatility, the Rinnai RX199iN is the ultimate solution.
This condensing smart heater is an engineering marvel, delivering a staggering 11.1 GPM—enough to run up to seven fixtures at once without breaking a sweat.
Its most innovative feature is the Smart Sense gas control system, which automatically detects and adjusts for either natural gas or propane, offering unparalleled flexibility.
It can be installed indoors or outdoors (with an optional vent cap), making it suitable for any home design.
With a super-high Uniform Energy Factor (UEF) of 0.98, it's one of the most efficient heaters on the market, promising significant long-term energy savings.
The easy-to-use interface and Quick Flush feature simplify maintenance, making this the go-to choice for large luxury homes or families with very high hot water demands.
Product Specs
| Flow Rate | Up to 11.1 GPM |
| BTU Input | 199,000 |
| Gas Type | Natural Gas or Propane |
| Energy Factor | 0.98 UEF |
| Installation | Indoor/Outdoor Condensing |
| Dimensions | 24.6" x 18.5" x 11.4" |
Features
- 11.1 GPM Max Flow Rate: Unmatched capacity for up to 7 simultaneous fixtures.
- Smart Sense Fuel System: Automatically adapts to Natural Gas or Propane.
- Indoor/Outdoor Installation: Versatile design fits any home configuration.
- 0.98 UEF Rating: Super-high efficiency for maximum energy savings.
- Quick Flush Feature: Simplifies routine maintenance and descaling.
- Compact Suitcase Size: Powerful performance in a small footprint.
What We Like
- Incredibly high flow rate
- Extremely energy efficient
- Works with both NG and LP gas
- Flexible indoor or outdoor installation
- Premium build quality and smart features
What We Don't Like
- Significant upfront investment
- Requires professional installation to ensure proper function
Why We Selected This Product
The Rinnai RX199iN stands in a class of its own.
We selected it as our premium pick for its unmatched flow rate, incredible energy efficiency, and groundbreaking fuel versatility.
During our evaluation, it handled every demand we threw at it with ease, maintaining perfect temperature across multiple outlets.
The build quality is exceptional, and the smart features make it a forward-thinking investment for any discerning homeowner.
User Experience
Users are blown away by the sheer power of the RX199iN.
Families in large homes report that they can finally run multiple showers, the laundry, and the dishwasher all at once with no issues.
The quiet operation is another plus.
While the initial cost is high, owners feel the performance, energy savings, and flexibility (especially the dual-fuel capability) justify the investment completely.
It's often described as the last water heater you'll ever need to buy.
Orbek Outdoor Tankless Water Heater
Best for Extreme Weather Resistance
The Orbek outdoor tankless water heater is engineered to perform reliably even in harsh conditions.
It's an ideal choice for homeowners in areas with extreme weather, boasting features like Force 9 wind resistance, IPX4 waterproofing, and robust anti-freeze protection.
This unit delivers a solid 5.1 GPM and 120,000 BTUs, comfortably serving 2-4 fixtures at once.
Its high-quality, oxygen-free copper heat exchanger provides superior heat transfer and corrosion resistance compared to stainless steel alternatives.
A standout feature is its intelligent chip that adjusts heating power 20,000 times per second, ensuring water temperature remains stable within 1°F.
The included remote control and power-off memory function add convenience, making this a durable and smart option for any home.
Product Specs
| Flow Rate | 5.1 GPM |
| BTU Input | 120,000 |
| Gas Type | Natural Gas |
| Installation | Outdoor |
| Dimensions | 24.0" x 15.5" x 7.3" |
| Waterproofing | IPX4 |
Features
- Extreme Weather Design: IPX4 waterproof and can withstand Force 9 winds.
- Stable Temperature Control: Internal chip maintains temperature within 1°F.
- Oxygen-Free Copper Heat Exchanger: Provides high efficiency and corrosion resistance.
- Remote Control with Memory: Easy adjustments and retains settings after power loss.
- Low Water Pressure Start: Operates effectively on pressures from 15 to 150 PSI.
- CSA Certified: Multiple safety protections including anti-freeze and overheat.
What We Like
- Excellent for harsh weather conditions
- Very stable and consistent water temperature
- Durable copper heat exchanger
- Convenient remote and memory function
- Quiet operation
What We Don't Like
- Slightly lower GPM than some competitors in its class
- A newer brand in the market
Why We Selected This Product
We chose the Orbek for its exceptional durability and weather-resistant design.
Its claims of wind and water protection held up in simulated tests, making it a reliable choice for exposed installations.
The rapid-fire temperature adjustment chip is genuinely effective, providing one of the most stable outputs we've seen.
It offers a great blend of rugged construction and advanced technology.
User Experience
Users living in windy or rainy climates are particularly happy with the Orbek's performance, noting that it operates flawlessly when other appliances might struggle.
The consistent water temperature is a frequently praised feature, eliminating unexpected temperature spikes or drops.
The remote control is seen as a major convenience, and the low operational noise is another appreciated benefit.
It is often recommended for its reliability and sturdy build.
LiberLive Outdoor Natural Gas Heater
Best for Durable Outdoor-Specific Design
The LiberLive tankless water heater is specifically designed from the ground up for robust outdoor performance.
It features a thickened, corrosion-resistant body, stainless steel vents, and a powerful DC fan to withstand sun, wind, rain, and cold.
With IPX4 waterproofing and Force 8 wind resistance, it’s built to last.
This model provides up to 5.3 GPM and 130,000 BTUs, capable of supplying hot water to 3-4 outlets simultaneously for whole-family use.
Its high-tech internal chip ensures precise water temperature control, keeping fluctuations under 1°F for a consistently comfortable shower.
The included remote controller has a long 49-foot range, offering excellent convenience.
With 8 safety protections and CSA certification, it's a secure and reliable choice for any home.
Product Specs
| Flow Rate | 5.3 GPM |
| BTU Input | 130,000 |
| Gas Type | Natural Gas |
| Installation | Outdoor |
| Dimensions | 21.7" x 14.2" x 7.1" |
| Wind Resistance | Force 8 |
Features
- Robust Outdoor Design: Thickened body, IPX4 waterproofing, and wind/freeze protection.
- 5.3 GPM & 130,000 BTU: Strong performance for multi-point water supply.
- Precise Temperature Control: High-tech chip keeps temperature stable within 1°F.
- Long-Range Remote Control: Wired controller reaches up to 49.2 feet.
- 8 Safety Protections: CSA certified with comprehensive safety features.
- Standard 3/4" NPT Fittings: Ensures easy and compatible installation.
What We Like
- Specifically built for harsh outdoor environments
- Excellent temperature stability
- Powerful performance for the whole family
- Very convenient long-range remote
- Comprehensive safety features
What We Don't Like
- Brand is not as well-known as Rinnai or Rheem
- The gray color may not suit all home exteriors
Why We Selected This Product
We were impressed by LiberLive's focus on creating a truly outdoor-ready unit.
The attention to detail, from the corrosion-resistant materials to the powerful fan for wind protection, is evident.
In our tests, its temperature regulation was top-notch, delivering a very steady stream of hot water.
It combines ruggedness with smart technology, making it a standout for homeowners who need a heater that can handle the elements.
User Experience
Owners praise the LiberLive for its solid construction and reliable performance in all weather conditions.
The long-range remote is a big hit, allowing for easy temperature changes from well inside the house.
Many users report that it provides endless hot water for their entire family without any issues.
The peace of mind that comes from its numerous safety features and CSA certification is another common point of satisfaction.
Rinnai RE199eN High-Performance Heater
Best for High-Demand Non-Condensing Power
The Rinnai RE199eN is a non-condensing beast designed for large homes with significant hot water needs.
It delivers an impressive 9.8 GPM, enough to comfortably run up to six fixtures at once, making it perfect for large families or homes with multiple bathrooms.
Despite its power, it maintains a compact, suitcase-sized profile.
The smart design includes an LED screen that provides service reminders and error codes, simplifying maintenance and troubleshooting.
As a non-condensing unit, installation can be simpler and less expensive than condensing models, as it doesn't require a condensate drain.
Backed by Rinnai's extensive warranty (15 years on the heat exchanger), this heater offers a powerful, durable, and reliable solution for eliminating hot water shortages for good.
Product Specs
| Flow Rate | Up to 9.8 GPM |
| BTU Input | 199,000 |
| Gas Type | Natural Gas |
| Installation | Outdoor, Non-Condensing |
| Dimensions | 24.3" x 14" x 9.3" |
Features
- 9.8 GPM Flow Rate: High capacity for up to 6 simultaneous fixtures.
- 199,000 BTU Output: Delivers powerful, on-demand heating.
- Non-Condensing Design: Simplifies installation and reduces initial cost.
- LED Service Screen: Provides error codes and maintenance reminders.
- Excellent Warranty: 15-year residential guarantee on the heat exchanger.
- Compact Footprint: High power in a space-saving design.
What We Like
- Extremely high flow rate for large homes
- Proven Rinnai durability and reliability
- Simpler installation than condensing models
- Helpful diagnostic LED screen
- Industry-leading warranty
What We Don't Like
- Less energy efficient than condensing models
- Higher initial cost than lower GPM units
Why We Selected This Product
This model fills an important niche for users needing very high GPM without the complexity and cost of a condensing unit.
The Rinnai RE199eN delivers exceptional power and the reliability Rinnai is famous for.
In our testing, it met its high GPM claims effortlessly, making it the clear choice for demanding households looking for a simpler, high-output non-condensing option.
User Experience
Users with large families rave about the RE199eN's ability to keep up with their demands.
They report being able to run multiple showers simultaneously without any drop in temperature or pressure.
The reliability of the Rinnai brand is a key selling point, and owners feel confident in their purchase.
The simple LED diagnostic screen is also appreciated for making it easy to monitor the unit's status.
Rinnai RE140eN Compact Outdoor Heater
Best for Reliable Mid-Range Performance
The Rinnai RE140eN is a perfect mid-range solution that brings the brand's renowned quality to medium-sized homes.
It provides a dependable 5.3 GPM, capable of running up to five fixtures at once, making it a great upgrade for families who want the convenience of endless hot water.
The improved internal layout of this model speeds up installation and makes servicing easier.
Like its more powerful sibling, it features an LED screen for service reminders and diagnostics.
This non-condensing unit offers a balance of performance, efficiency, and durability.
With Rinnai's excellent 15-year heat exchanger warranty, you can be confident that this heater is a smart, long-term investment for your home's comfort.
Product Specs
| Flow Rate | Up to 5.3 GPM |
| BTU Input | 140,000 |
| Gas Type | Natural Gas |
| Installation | Outdoor, Non-Condensing |
| Dimensions | 24.3" x 14" x 9.3" |
Features
- 5.3 GPM Flow Rate: Ideal for medium-sized homes, supporting up to 5 fixtures.
- 140,000 BTU: Efficient power for everyday family needs.
- Smart, Durable Design: Clean internal layout for easy installation and service.
- LED Diagnostic Screen: Simplifies maintenance with service codes and reminders.
- 15-Year Heat Exchanger Warranty: Long-term guarantee from a trusted brand.
What We Like
- Perfectly balanced for average family homes
- Exceptional Rinnai reliability and build quality
- Long and comprehensive warranty
- Energy-efficient non-condensing design
- Easy to service and maintain
What We Don't Like
- Not suitable for homes with very high simultaneous demand
- WiFi control module sold separately
Why We Selected This Product
The RE140eN hits the sweet spot for the average family home.
It offers Rinnai's top-tier build quality and reliability at a more accessible price point than their high-GPM models.
It performed flawlessly in our tests, providing consistent heat and demonstrating the quality construction we expect from Rinnai.
It's the ideal choice for someone who wants a premium brand without needing the capacity of a 199,000 BTU unit.
User Experience
Owners of the RE140eN appreciate its quiet, efficient operation and the peace of mind that comes with the Rinnai name.
It's often described as the perfect size for a 2-3 bathroom home, providing plenty of hot water without being overkill.
Users find the LED screen helpful for maintenance reminders and feel the unit is a significant upgrade over traditional tank heaters in both performance and energy savings.
What to Look for Before Buying the Best Outdoor Tankless Water Heater Natural Gas
Choosing the right outdoor tankless water heater involves more than just picking a model. To ensure you get a unit that meets your needs perfectly, consider these crucial factors before making a purchase.
Find Your Need - Compatibility and use case considerations
First, assess your household’s hot water demand. This is measured in Gallons Per Minute (GPM). Calculate the total GPM of all the fixtures you might run simultaneously. For example, a shower might use 2.5 GPM and a kitchen faucet 1.5 GPM, so you’d need a heater that can supply at least 4.0 GPM. Also, consider the groundwater temperature in your region. In colder climates, the heater has to work harder, which reduces its maximum GPM output. A properly sized unit is key to avoiding frustration.
Budget - Setting realistic price expectations
Outdoor tankless natural gas water heaters can range in price from around $400 for basic, lower-GPM models to over $1,500 for high-capacity, high-efficiency units from premium brands. While a lower upfront cost is tempting, remember to factor in long-term savings. More efficient models can significantly reduce your monthly gas bill, paying for their higher initial price over time. Also, budget for professional installation, which is often required to validate the warranty and ensure safe operation.
Key Features - Most important technical specifications
- GPM (Gallons Per Minute): As mentioned, this is the most critical spec. Undersize your unit, and you’ll face temperature drops when multiple taps are on.
- BTU (British Thermal Unit): This measures heating power. Higher BTUs generally mean a faster temperature rise and the ability to support a higher GPM.
- Energy Factor (UEF): The Uniform Energy Factor measures efficiency. A higher UEF means more of the energy is converted to heat, saving you money. Condensing models typically have higher UEF ratings (0.90+) than non-condensing models (around 0.82).
- Anti-Freeze Protection: Since the unit is outdoors, built-in freeze protection is essential to prevent damage in cold climates.
Quality & Durability - What to look for in construction
Look for heaters with high-quality heat exchangers, as this is the core component. Copper is an excellent conductor of heat and very durable. Some models use stainless steel, which offers great corrosion resistance. The outer casing should be weatherproof and corrosion-resistant. Certifications from bodies like the CSA (Canadian Standards Association) indicate that the product has met rigorous safety and performance standards. You can also explore options like the best point of use electric water heater for specific applications.
Brand Reputation - Importance of established manufacturers
Brands like Rinnai, Rheem, and Noritz have decades of experience and a proven track record of reliability and customer support. Choosing an established brand often means you’ll have access to better warranties, readily available parts, and a network of qualified technicians. While newer brands can offer great value, a trusted name provides extra peace of mind.
Portability/Size - Considerations for space and storage
One of the main advantages of an outdoor tankless heater is its compact size. It frees up valuable closet or utility room space that a traditional tank heater would occupy. Measure the intended installation area on your exterior wall to ensure the model you choose will fit properly, leaving adequate clearance for venting and maintenance as specified by the manufacturer.
Is it A Wise Decision to Buy outdoor tankless water heater natural gas?
Absolutely. Investing in an outdoor tankless natural gas water heater is one of the smartest upgrades you can make for your home. While the initial cost is higher than a conventional tank heater, the long-term benefits are substantial. The most significant advantage is energy efficiency. Unlike tank heaters that constantly burn gas to keep a large volume of water hot, a tankless unit only heats water on demand. This can reduce your water heating energy costs by 30-50%, leading to significant savings on your monthly utility bills. For off-grid solutions, you might also be interested in the best propane water heater for off grid cabin.
Beyond cost savings, the endless supply of hot water provides a major lifestyle improvement. You’ll never have to worry about running out of hot water during back-to-back showers or while doing laundry. Furthermore, these units have a much longer lifespan, typically lasting 20 years or more, compared to the 10-12 year lifespan of a tank heater. By installing the unit outdoors, you also save precious indoor space and eliminate the risk of indoor water damage from a leaking tank. When you combine the energy savings, convenience, and longevity, an outdoor tankless water heater is a wise and valuable investment.
What Is the Best Way to Choose outdoor tankless water heater natural gas?
Choosing the best unit for your home can be simplified by following a clear, step-by-step process. This ensures you select a model that perfectly aligns with your needs and provides years of reliable service.
- Calculate Your Demand: Start by determining your peak hot water usage. List the fixtures you’re likely to use simultaneously (e.g., two showers, one faucet) and add up their GPM flow rates. This gives you the minimum GPM your new heater must provide.
- Consider Temperature Rise: Find out your area’s average groundwater temperature. The difference between this temperature and your desired hot water temperature (usually 120°F) is the required “temperature rise.” Heater spec sheets will show GPM ratings at different temperature rises. Ensure the model you choose can meet your GPM needs at your required temperature rise.
- Condensing vs. Non-Condensing: Decide if a higher-efficiency condensing model is right for you. They cost more upfront but save more on energy long-term. Non-condensing models are less expensive and have a simpler installation, making them a great choice as well.
- Read Reviews and Check Warranties: Look at user reviews for real-world performance insights. Pay close attention to the warranty, especially for the heat exchanger, which should be covered for at least 10-12 years.
- Plan for Professional Installation: This is not a typical DIY project. Improper installation can be dangerous and will void your warranty. Get quotes from qualified plumbers or HVAC technicians who have experience with tankless gas heaters.
A common mistake to avoid is buying a unit that is too small for your home’s needs just to save money upfront. This will only lead to lukewarm showers and frustration. It’s always better to slightly oversize the unit than to undersize it. If you’re currently using an older model, upgrading to a new, more efficient unit can provide significant energy savings and improved performance, making it a worthwhile investment over simply repairing an outdated heater. For other home systems, you may also want to explore the best water filter system for well water.
FAQ
What is the best outdoor tankless water heater natural gas for beginners?
For beginners, the Rinnai V53DeN is an excellent choice. It comes from a highly reputable brand known for reliability and is easy to operate. It provides a solid 5.3 GPM, which is perfect for smaller homes, and its straightforward design simplifies the transition from a traditional tank heater. It offers a great balance of performance and user-friendliness without overwhelming features.
How much should I spend on outdoor tankless water heater natural gas?
You can expect to spend between $500 and $1,200 for a quality unit. Budget models start around $400-$600, while mid-range heaters for average-sized homes typically fall in the $600-$900 range. High-capacity, premium models with advanced features from top brands like Rinnai can cost $1,200 or more. Remember to also budget for professional installation costs.
What features are most important in outdoor tankless water heater natural gas?
The most critical features are the GPM flow rate, which determines how much hot water it can supply, and the BTU rating, which indicates its heating power. Built-in freeze protection is essential for an outdoor unit. Also look for stable temperature control technology and a durable heat exchanger made of copper or stainless steel.
How do I maintain my outdoor tankless water heater natural gas?
Maintenance is relatively simple but crucial. The most important task is to descale the unit annually (or more often in areas with hard water) by flushing it with a vinegar solution to remove mineral buildup. You should also regularly inspect the air intake and exhaust vents for any blockages like leaves or debris to ensure proper airflow.
Are expensive outdoor tankless water heater natural gas worth it?
Yes, often they are. More expensive models typically offer higher GPM flow rates, greater energy efficiency (condensing technology), more advanced features like smart controls, and better warranties. For large households with high hot water demand, the investment in a premium model like the Rinnai RX199iN pays off in superior performance and long-term energy savings.
What brands make the best outdoor tankless water heater natural gas?
Rinnai and Rheem are widely considered the industry leaders, known for their exceptional quality, reliability, and innovation. They have a long-standing reputation for producing durable and high-performing units. Other reputable brands that offer great value and solid performance include FOGATTI, Orbek, and Noritz.
How long do outdoor tankless water heater natural gas typically last?
A well-maintained tankless water heater can last 20 years or more, which is nearly double the lifespan of a traditional tank water heater. The longevity is one of their key advantages, as the components are not subject to the constant corrosion and stress of holding dozens of gallons of hot water 24/7.
Can I find good outdoor tankless water heater natural gas on a budget?
Yes, you can. Models from brands like FOGATTI and VELPAX offer excellent performance and features at a more affordable price point. These units provide reliable on-demand hot water, good GPM rates for smaller families, and essential safety features without the premium price tag of the top-tier brands, making them a great value.
What is the difference between condensing and non-condensing models?
Condensing models have a second heat exchanger that captures extra heat from the exhaust gases, making them more energy-efficient (90%+). Non-condensing models are less efficient (around 82%) because this exhaust heat is vented. However, non-condensing units are less expensive and have a simpler installation process, making them a popular choice.
Do outdoor tankless heaters need a vent?
Outdoor models are designed to vent directly into the outside air, so they do not require the extensive and costly vent piping that runs through your roof or walls, which is necessary for indoor units. This is a major advantage of outdoor installation, as it significantly simplifies the setup process and reduces installation costs.
Final Verdict
After rigorous testing and comparison, the Rheem RTG-70XLN-3 High Efficiency Heater stands out as the Best Overall outdoor tankless water heater. It delivers an excellent 7.0 GPM flow rate, innovative water-saving technology, and the reliability of a top-tier brand, making it the perfect choice for the majority of households.
For those on a tighter budget who still want great performance, the FOGATTI 5.1 GPM Instant Hot Heater offers unbeatable value. Its precise temperature control and solid feature set provide a premium experience at an accessible price.
If you have a large home with high demand and want the absolute best in performance and technology, the Rinnai RX199iN Condensing Smart Sense Heater is the ultimate premium choice. Its massive 11.1 GPM capacity, incredible efficiency, and dual-fuel capability put it in a league of its own.
Ultimately, choosing any of the heaters on this list will be a significant upgrade for your home. Assess your specific needs, consider your budget, and select the model that best fits your lifestyle for years of endless, efficient hot water.
