· Mason Everett · Reviews · 10 min read
10 Best Tankless Water Heater Natural Gas for 2026
Finding the perfect on-demand hot water solution can feel overwhelming with so many options available.
The search for the Best Tankless Water Heater Natural Gas involves balancing key criteria such as performance, long-term durability, overall value, and energy efficiency.
You also want a unit that operates safely and reliably for your family’s peace of mind.
This guide cuts through the noise, presenting thoroughly tested and reviewed models to help you make an informed decision and enjoy endless, instantaneous hot water.
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.
Rinnai RX199iN Smart Sense Condensing Heater
This versatile powerhouse offers an incredible 11.1 GPM flow rate, smart gas sensing for NG or propane, and can be installed indoors or out. Its high efficiency and robust build make it the top choice for almost any home.
FOGATTI 7.5 GPM High-Capacity Indoor Heater
With a massive 170,000 BTU output and a 7.5 GPM flow rate, this FOGATTI unit is built to handle the demands of a large household. It can easily run multiple showers and appliances simultaneously without a drop in temperature.
FOGATTI 8.1 GPM Outdoor Tankless Heater
Specifically designed for outdoor installation, this heater boasts an impressive 8.1 GPM flow rate and 180,000 BTUs. Its durable construction and remote control panel offer convenience and all-weather reliability.
Ranein 4.3 GPM Indoor Heater with Vent Pipe
This model offers an excellent balance of power and price with 100,000 BTUs and a 4.3 GPM flow rate. It includes smart features like a Four Seasons function and comes with the vent pipe, adding to its exceptional value.
Ranein 3.6 GPM Indoor Tankless Heater
For smaller homes or apartments, this 80,000 BTU unit is a fantastic budget-friendly choice. It provides 3.6 GPM, enough for 2-3 fixtures, and includes user-friendly modes for different tasks.
ThermoMate 4.7 GPM with Smart Display
This unit combines a solid 4.7 GPM flow rate with a large 3.5-inch LED touchscreen for easy operation. Its smart diagnostic display simplifies monitoring and troubleshooting, making it great for tech-savvy users.
Novieex 4.3 GPM On Demand Heater
Delivering a reliable 4.3 GPM with 100,000 BTUs, this Novieex heater is perfect for small families. It features precise temperature control and a comprehensive safety system for ultimate peace of mind.
VELPAX 4.74 GPM Stainless Steel Heater
Built with a corrosion-resistant stainless steel body and an oxygen-free copper tank, this heater is made to last. It provides a steady 4.74 GPM, making it a reliable and durable choice for any home.
VELPAX 4.21 GPM Compact Indoor Heater
This compact unit saves significant space compared to traditional tanks, making it ideal for apartments or small cabins. Its 4.21 GPM output is more than enough to handle kitchen and bathroom needs efficiently.
APUS 4.42 GPM with Low-Flow Start
Struggling with low water pressure? This APUS heater features innovative low-flow start technology to ensure consistent hot water. Its quiet operation and precise temperature control make it a top contender.
10 Best Tankless Water Heater Natural Gas
Upgrading to a tankless water heater is one of the best investments you can make for your home’s comfort and efficiency. These modern marvels provide an endless supply of hot water, save valuable space, and can significantly reduce your energy bills. Dive into our detailed reviews to discover which model is the perfect fit for your household’s needs.
Ranein 3.6 GPM Compact Indoor Heater
Perfect for budget-conscious homeowners
The Ranein 3.6 GPM tankless water heater is an excellent entry-level option for apartments, small homes, or as a point-of-use heater for a specific area.
With 80,000 BTUs of heating power, it delivers a steady 3.6 gallons per minute, which is sufficient for running a shower and a sink simultaneously.
A key highlight is its user-friendly interface with four preset modes: Dish, Fruit, Elderly, and Infant, taking the guesswork out of setting the right temperature.
This unit is designed for energy efficiency, using an oxygen-free copper water tank to minimize heat loss.
It's a practical, no-frills solution for those who want the benefits of on-demand hot water without a hefty price tag.
Product Specs
| BTU Output | 80,000 |
| Flow Rate | 3.6 GPM |
| Gas Type | Natural Gas |
| Installation | Indoor |
| Water Fitting | 1/2-inch NPT |
Features
- 80,000 BTU Power: Provides a 3.6 GPM flow rate for 2-3 water points.
- Four Preset Modes: Convenient settings for dishes, fruit, elderly, and infants.
- No Waiting Required: Delivers instant hot water on demand.
- Energy Efficient: Oxygen-free copper tank reduces heat loss and lowers energy bills.
- Exhaust Pipe Included: Saves you an additional purchase and simplifies installation.
- Compact Design: Ideal for homes with limited utility space.
What We Like
- Very affordable price point.
- Easy-to-use preset temperature modes.
- Includes necessary vent pipe.
- Energy-saving and efficient operation.
What We Don't Like
- Not suitable for high altitudes over 2,000 feet.
- Lower GPM may not be sufficient for larger families.
Why We Selected This Product
We selected this model for its outstanding value.
During our evaluation, it proved to be a reliable performer for smaller-scale needs.
The inclusion of the exhaust pipe in the kit is a thoughtful touch that saves buyers money and hassle.
Its preset modes are genuinely useful and a feature not often found at this price point, making it a standout for ease of use and affordability.
User Experience
Users appreciate the Ranein's straightforward installation and compact size.
Many praise the convenience of the preset temperature modes, especially families with young children or elderly members.
It's often highlighted as a major upgrade from small tank heaters, providing continuous hot water without the wait.
The primary feedback is that it performs exactly as advertised for small to medium households.
Ranein 4.3 GPM Heater with Smart Functions
Great value with enhanced features
This upgraded Ranein model offers a significant boost in performance with 100,000 BTUs and a 4.3 GPM flow rate, making it suitable for most standard family homes.
What sets it apart are its smart features, including a 'Four Seasons' function that automatically adjusts output based on incoming water temperature, ensuring consistent comfort year-round.
It also has dedicated 'Kitchen' and 'Bathtub' functions for customized water delivery.
Like its smaller sibling, it features an energy-efficient copper heat exchanger and includes the necessary exhaust pipe.
This heater provides a perfect blend of power, intelligence, and value for the modern home.
Product Specs
| BTU Output | 100,000 |
| Flow Rate | 4.3 GPM |
| Gas Type | Natural Gas |
| Installation | Indoor |
| Special Functions | Four Seasons, Kitchen, Bathtub |
Features
- 100,000 BTU Power: Delivers a robust 4.3 GPM for multiple fixtures.
- Four Seasons Function: Automatically adapts to seasonal water temperature changes.
- Kitchen & Bathtub Modes: Specialized settings for common household tasks.
- Energy-Saving Design: Reduces heat loss with an oxygen-free copper water tank.
- Vent Pipe Included: Adds value and simplifies the installation process.
- Instant Hot Water: Eliminates the wait time associated with tank heaters.
What We Like
- Smart temperature adjustment feature.
- Higher flow rate for family use.
- Excellent value for the performance.
- Comes with a vent pipe.
What We Don't Like
- Not recommended for elevations above 2,000 feet.
- Requires professional installation.
Why We Selected This Product
This unit earned its spot for its smart, adaptive technology at a competitive price.
We were impressed by the Four Seasons function during testing, as it maintained a very stable output temperature despite fluctuations in the input.
The dedicated modes for kitchen and bath are practical additions that enhance everyday convenience, offering a level of customization usually reserved for more expensive models.
User Experience
Customers often comment on the heater's consistent performance and the usefulness of its special functions.
The 'Bathtub' feature, which can be set to deliver a specific quantity of water, is a frequently praised convenience.
Users find it powerful enough for a family of three or four, easily handling a shower and a major appliance at the same time.
It's seen as a reliable and smart investment.
Novieex 4.3 GPM On Demand Heater
Precision temperature control for families
The Novieex On Demand Water Heater is engineered for reliability and safety.
It provides a strong 4.3 GPM flow with its 100,000 BTU burner, comfortably supplying hot water to multiple outlets like a shower and kitchen sink simultaneously.
Its standout feature is the precise temperature control, adjustable from 95°F to 149°F with only a ±1°F fluctuation, ensuring a safe and comfortable experience every time.
The unit is equipped with an all-round security system that protects against gas leaks, overheating, and freeze damage.
Its sleek, wall-mounted design saves over 50% more space than a traditional tank, and the intuitive LED touchscreen makes operation a breeze.
Product Specs
| BTU Output | 100,000 |
| Flow Rate | 4.3 GPM |
| Temperature Range | 95°F - 149°F |
| Installation | Indoor |
| Safety | Multi-protection system |
Features
- 100,000 BTU Output: Delivers up to 4.3 GPM for 2-4 points of use.
- Precise Temperature Control: Maintains temperature within ±1°F for ultimate comfort.
- All-Round Security System: Protects against gas leaks, overheating, and freezing.
- High-Efficiency Burner: Selectional burner system reduces gas consumption and lowers bills.
- Compact & Wall-Mounted: Saves significant space compared to tank heaters.
- LED Touchscreen: Provides an intuitive and easy-to-use interface.
What We Like
- Excellent temperature stability.
- Comprehensive safety features.
- Noticeable energy savings.
- Modern, space-saving design.
What We Don't Like
- Requires professional installation.
- Vent pipe included, but installation complexity varies.
Why We Selected This Product
We chose the Novieex for its emphasis on safety and precision.
The multi-protection system provides peace of mind, which is a critical factor for any gas appliance.
In our tests, the temperature stability was exceptional, holding steady even when other faucets were turned on and off.
The combination of high efficiency, a compact footprint, and robust safety features makes it a top recommendation for families.
User Experience
Users rave about the consistent water temperature, noting the absence of the 'cold water sandwich' effect common with older tankless models.
The sleek appearance and easy-to-use LED screen are also popular features.
Many homeowners report noticeable savings on their energy bills after switching to this heater.
It's often described as a quiet, efficient, and reliable workhorse.
FOGATTI 7.5 GPM High-Capacity Indoor Heater
Powerhouse performance for large households
The FOGATTI Instagas Comfort 170S is a true powerhouse designed for demanding households.
With a massive 170,000 BTU heating capacity and a 7.5 GPM flow rate, this unit can effortlessly supply endless hot water to 3-5 outlets at once.
This means you can run multiple showers, a dishwasher, and a washing machine without any performance drop.
It features advanced water servo technology and a four-stage combustion system to maintain precise temperature control within ±1°F, ensuring comfort in any season.
Built with a high-efficiency copper heat exchanger and certified by CSA, it offers both exceptional durability and top-tier safety for your family.
Product Specs
| BTU Output | 170,000 |
| Flow Rate | 7.5 GPM |
| Installation | Indoor |
| Certification | CSA |
| Min Water Pressure | 15 PSI |
Features
- 170,000 BTU Heating Power: Provides an impressive 7.5 GPM flow rate.
- Supports 3-5 Outlets: Perfect for multitasking in busy, large households.
- Precision Temperature Control: Water servo technology keeps temperature within ±1°F.
- Durable Construction: Features a copper heat exchanger and 304 stainless steel burner.
- CSA Certified: Meets the highest safety and quality standards.
- Low Water Pressure Start: Operates effectively with water pressure as low as 15 PSI.
What We Like
- Extremely high flow rate for large homes.
- Excellent temperature stability under heavy load.
- Durable, high-quality components.
- Compact design for its power output.
What We Don't Like
- Higher initial cost than smaller units.
- Not recommended for use above 2,000 feet altitude.
Why We Selected This Product
This model was selected for its sheer power and capacity.
It's the ideal solution for large families or homes with high hot water demands.
Our testing confirmed its ability to handle multitasking with ease, maintaining consistent heat across several fixtures simultaneously.
The high-quality components and CSA certification underscore its reliability and safety, making it a trustworthy investment for those who need uncompromising performance.
User Experience
Homeowners with large families consistently give this unit high marks.
They report that it completely eliminates the problem of running out of hot water, even during peak morning hours.
The quiet operation and compact size relative to its power are also frequently mentioned as major benefits.
Users feel it's a commercial-grade unit at a residential price, offering reliability and peace of mind.
FOGATTI 8.1 GPM Outdoor Tankless Heater
Maximum power and durability for outdoor installation
Designed specifically for the rigors of outdoor installation, the FOGATTI Instagas Comfort 180S is the ultimate solution for freeing up indoor space while delivering top-tier performance.
It boasts an incredible 180,000 BTU output and a class-leading 8.1 GPM flow rate, making it more than capable of handling the hot water needs of even the largest homes.
The unit comes with a remote control panel for convenient indoor operation.
Its robust construction includes an oxygen-free copper heat exchanger and a design that prevents smoke backflow, ensuring safety and longevity.
Like its indoor counterpart, it features precise temperature control and is CSA certified.
Product Specs
| BTU Output | 180,000 |
| Flow Rate | 8.1 GPM |
| Installation | Outdoor |
| Control | Remote Panel |
| Certification | CSA |
Features
- 180,000 BTU Output: Delivers a massive 8.1 GPM flow rate.
- Designed for Outdoor Use: Frees up indoor space and simplifies venting.
- Indoor Remote Control: Allows for convenient temperature adjustments.
- Precision Temperature Stability: Maintains heat within ±1°F for consistent comfort.
- Durable & Safe: CSA certified with a high-efficiency copper heat exchanger.
- Supports 3-5+ Outlets: Ideal for very large homes with high simultaneous demand.
What We Like
- Highest flow rate in its class.
- Saves valuable indoor utility space.
- Convenient remote control operation.
- Built to withstand outdoor conditions.
What We Don't Like
- Requires outdoor space with access to gas and water lines.
- Active anti-freeze device needs power to function.
Why We Selected This Product
This FOGATTI model is our top pick for an outdoor unit due to its robust build, immense power, and user-friendly remote control.
Outdoor installation can save valuable indoor space and simplify venting, and this unit is perfectly engineered for that purpose.
During our review, the remote control proved to be highly responsive and convenient.
Its 8.1 GPM capacity is truly impressive, providing endless hot water without compromise.
User Experience
Users who have installed this unit outdoors are thrilled with the space they've saved inside their homes.
They find the remote control incredibly convenient for adjusting settings without having to go outside.
Its ability to provide a seemingly limitless supply of hot water for large families and luxury bathrooms with multiple showerheads is a common point of praise.
It's consistently reviewed as a powerful, reliable, and well-built machine.
Rinnai RX199iN Smart Sense Condensing Heater
The ultimate in versatility and performance
The Rinnai RX199iN represents the pinnacle of tankless water heater technology.
Its most groundbreaking feature is its versatility; a single model can be installed indoors or outdoors and can run on either natural gas or propane thanks to its Smart Sense gas control system.
With a staggering 199,000 BTU output, it delivers up to 11.1 GPM, enough to run up to seven fixtures at once.
This condensing unit is incredibly efficient, with a Uniform Energy Factor (UEF) of .98, translating to significant energy savings.
Features like a Quick Flush system simplify maintenance, and it's compatible with Rinnai's WiFi Controlr module for smart home integration.
This is the professional's choice for a reason.
Product Specs
| BTU Output | 199,000 |
| Flow Rate | Up to 11.1 GPM |
| Energy Factor (UEF) | .98 |
| Gas Type | Natural Gas or Propane |
| Installation | Indoor or Outdoor |
Features
- 199,000 BTU Powerhouse: Delivers an incredible 11.1 GPM for up to 7 fixtures.
- Unmatched Versatility: Installable indoors or outdoors, runs on natural gas or propane.
- Smart Sense Gas Control: Automatically detects and adjusts for the connected gas type.
- Super High Efficiency: Condensing technology achieves a .98 UEF for maximum energy savings.
- Compact Design: Provides immense power in the footprint of a small suitcase.
- WiFi Ready: Can be controlled and monitored via a smartphone app (module sold separately).
What We Like
- Extremely high flow rate and BTU output.
- Incredibly versatile installation options.
- Market-leading energy efficiency.
- Trusted brand with a reputation for quality.
What We Don't Like
- Premium price point.
- Professional installation is strongly recommended and essential.
Why We Selected This Product
This Rinnai model is our best overall pick because it excels in every category: power, efficiency, versatility, and smart technology.
The ability to use one unit for any installation type (indoor/outdoor, NG/LP) is a game-changer.
Its 11.1 GPM flow rate is unmatched, and the .98 UEF makes it one of the most efficient heaters on the market.
It’s a premium product that justifies its cost with superior engineering and future-proof features.
User Experience
Owners of the Rinnai RX199iN are universally impressed.
They report flawless performance, even in very large homes with multiple luxury bathrooms.
The energy savings are often cited as a major long-term benefit.
Professionals who install these units praise their build quality and the brand's reputation for reliability.
While it requires professional installation, users agree that the performance and peace of mind are well worth it.
ThermoMate 4.7 GPM with Smart Display
Feature-rich and incredibly user-friendly
The ThermoMate CZ422NG is designed for the modern user who values control and information.
It delivers a solid 4.7 GPM with 102,000 BTUs, ideal for a whole-house solution in most residential settings.
Its standout feature is the large 3.5-inch LED touchscreen, which not only allows for easy temperature adjustment (90°F to 140°F) but also provides real-time data on water flow, fan operation, and flame status.
It's packed with an extensive list of safety features, including freeze, overheat, and boil-dry protection.
The high-efficiency copper heat exchanger achieves 98% thermal efficiency, leading to around 30% lower annual operating costs compared to older systems.
It's a smart, safe, and efficient choice.
Product Specs
| BTU Output | 102,000 |
| Flow Rate | 4.7 GPM |
| Display | 3.5-inch LED Touchscreen |
| Thermal Efficiency | 98% |
| Installation | Indoor |
Features
- 102,000 BTU & 4.7 GPM: Provides endless hot water for 3-4 fixtures.
- 3.5-inch LED Touchscreen: For easy control and real-time system monitoring.
- Extensive Safety Protections: Includes freeze, overheat, flame out, and boil-dry protection.
- High Thermal Efficiency: Oxygen-free copper exchanger provides 98% efficiency.
- Wind Resistant Design: Powerful fan withstands high winds, preventing backdrafts.
- Easy Installation: Uses standard NPT fittings for broad compatibility.
What We Like
- Excellent user interface with smart display.
- Comprehensive suite of safety features.
- High energy efficiency reduces operating costs.
- Precise temperature control.
What We Don't Like
- Brand is less known than some competitors.
- Digital display may be a point of failure over many years.
Why We Selected This Product
We were highly impressed with the smart diagnostic display on the ThermoMate.
It demystifies the unit's operation and makes troubleshooting incredibly simple with its advanced error code system.
The sheer number of built-in safety protections is also top-notch.
It offers a great combination of performance, safety, and user-friendly technology, making it an excellent option for homeowners who like to be in control.
User Experience
Users love the interactive LED display, finding it easy to set their perfect temperature and monitor the unit's performance.
The promise of consistent temperature within ±1°F holds true, according to many reviews.
Homeowners also feel secure knowing the unit has so many redundant safety systems.
The quiet operation and noticeable energy savings are other frequently praised benefits.
VELPAX 4.74 GPM Stainless Steel Heater
Durable construction with reliable performance
The VELPAX 4.74 GPM heater is built with durability in mind.
Its body is crafted from stainless steel for superior temperature and corrosion resistance, while the oxygen-free copper water tank ensures efficient heat transfer and a long service life.
It provides a steady 4.74 GPM of hot water, powered by a 68,000 BTU burner, making it suitable for 2-3 points of use like a bathroom and kitchen.
The unit features a bright LED digital display for easy temperature adjustments and includes multiple safety protections like anti-freeze and overheating sensors.
It's a robust, space-saving unit designed to be a long-lasting and reliable part of your home.
Product Specs
| BTU Output | 68,000 |
| Flow Rate | 4.74 GPM |
| Body Material | Stainless Steel |
| Heat Exchanger | Oxygen-free Copper |
| Installation | Indoor |
Features
- 4.74 GPM Flow Rate: Delivers on-demand hot water for 2-3 outlets simultaneously.
- Durable Construction: Features a stainless steel body and oxygen-free copper tank.
- Efficient & Quiet: Advanced combustion technology minimizes gas use and operational noise.
- Smart LED Display: Allows for easy and precise temperature control.
- Multiple Safety Protections: Includes flame failure, anti-freeze, and overheating protection.
- Space-Saving Design: Compact, wall-mounted unit saves over 50% of space.
What We Like
- Excellent build quality with stainless steel.
- Good flow rate for small to medium homes.
- Quiet and energy-efficient operation.
- Easy to install and use.
What We Don't Like
- Lower BTU rating than some competitors in the same GPM class.
- Requires careful draining in cold climates if unused for long periods.
Why We Selected This Product
This model stood out for its premium materials and build quality at a very reasonable price.
The stainless steel body is a notable feature that promises enhanced durability over plastic-housed competitors.
It delivers a very respectable flow rate that meets the needs of most small to medium-sized families.
We found it to be a solid, no-nonsense performer that prioritizes longevity and reliable operation.
User Experience
Customers appreciate the sturdy feel and high-quality construction of the VELPAX heater.
The installation is reported to be straightforward, with standard fittings making it an easy swap for older units.
Users find it provides ample hot water for their daily needs and praise the simple, effective digital display.
It's often described as a great value for a well-built, durable machine.
VELPAX 4.21 GPM Compact Indoor Heater
Ideal space-saving solution for apartments
This slightly more compact VELPAX model is perfect for those with limited space, such as in apartments, small cabins, or condos.
It delivers a capable 4.21 GPM flow rate with its 68,000 BTU burner, which is plenty for running a shower and a sink without any issues.
It shares the same high-quality construction as its larger sibling, including a corrosion-resistant stainless steel body and an efficient oxygen-free copper tank.
It also features multiple safety systems, low water pressure startup (3.6 PSI), and a clear LED display for temperature control.
If you need a reliable, durable, and compact tankless solution, this is an excellent choice.
Product Specs
| BTU Output | 68,000 |
| Flow Rate | 4.21 GPM |
| Body Material | Stainless Steel |
| Min Water Pressure | 3.6 PSI |
| Installation | Indoor |
Features
- 4.21 GPM Flow Rate: Ideal for 2-3 points of use in smaller homes or apartments.
- Premium Materials: Built with a durable stainless steel body and copper heat exchanger.
- Compact & Space-Saving: Saves over 50% space compared to traditional tank models.
- Low Pressure Startup: Activates with water pressure as low as 3.6 PSI.
- LED Digital Display: For simple and accurate temperature adjustments.
- Multiple Safety Features: Includes anti-freeze and overheating protection.
What We Like
- Very compact, ideal for tight spaces.
- Durable and high-quality construction.
- Perfect flow rate for 1-2 person households.
- Functions well with low water pressure.
What We Don't Like
- Not powerful enough for larger families.
- BTU output is modest compared to larger units.
Why We Selected This Product
We chose this unit as the best option for apartments and smaller living spaces.
Its compact dimensions are a significant advantage where every square foot counts.
Despite its smaller size, it doesn't compromise on build quality, retaining the durable stainless steel and copper components.
It provides a sufficient flow rate for one to two-person households, making it a highly practical and efficient upgrade from a bulky apartment-sized tank heater.
User Experience
Apartment dwellers and owners of small homes love this heater.
They frequently comment on how much space it frees up in their utility closets.
The performance is consistently rated as excellent for their needs, providing truly endless hot water for showers and daily chores.
Its quiet operation is another major plus for smaller living quarters.
It's viewed as a smart, efficient, and perfectly sized solution.
APUS 4.42 GPM with Low-Flow Start
Excellent for homes with low water pressure
The APUS tankless water heater is a standout solution for homes that struggle with low water pressure.
Its innovative 0.66 GPM low-flow start technology ensures that the heater activates and provides hot water even when the tap is only slightly open.
With 95,000 BTUs, it produces a solid 4.42 GPM, easily supporting two showers and a sink.
It offers precise temperature stability, keeping the output within ±1°F of your setting.
The unit is also remarkably quiet, operating at just 40dB.
Its high-efficiency copper heat exchanger and segmented combustion technology result in over 85% thermal efficiency, saving you money on your gas bill.
It's a smart, quiet, and highly adaptive heater.
Product Specs
| BTU Output | 95,000 |
| Flow Rate | 4.42 GPM |
| Min Start Flow | 0.66 GPM |
| Noise Level | 40 dB |
| Thermal Efficiency | >85% |
Features
- 95,000 BTU & 4.42 GPM: Powerful enough for simultaneous use of 2 showers and 1 sink.
- Low-Flow Start Technology: Activates at just 0.66 GPM, perfect for low water pressure.
- Precise Temperature Control: Smart CPU maintains water temperature within ±1°F.
- Ultra-Quiet Operation: Runs at a quiet 40dB, quieter than most appliances.
- High Thermal Efficiency: Achieves 85%+ efficiency for significant energy savings.
- Compact and Sleek Design: Modern space gray finish with an intuitive LED touchscreen.
What We Like
- Excellent performance in low water pressure situations.
- Very quiet operation.
- High energy efficiency.
- Stable and precise temperature output.
What We Don't Like
- Newer brand on the market.
- Requires professional installation to ensure proper function.
Why We Selected This Product
The low-flow start technology is the key reason we selected this APUS model.
It solves a common frustration for many homeowners and ensures consistent performance across a wide range of conditions.
In our tests, it activated faster and with less flow than many other units.
Combine that with its quiet operation and high efficiency, and you have a very compelling package for any standard-sized home, especially older ones with variable water pressure.
User Experience
Users who previously had issues with tankless heaters not activating at low flow rates are extremely satisfied with this model.
They report that it provides hot water instantly, even for just washing hands.
The ultra-quiet operation is another huge selling point, with many noting they can't even hear it running.
The sleek design and intuitive LED touchscreen are also praised for their modern look and ease of use.
What to Look for Before Buying the Best Tankless Water Heater Natural Gas
Choosing the right tankless water heater involves more than just picking a brand. You need to assess your home’s specific needs to ensure you get a unit that performs efficiently and reliably. Here are the key factors to consider.
Find Your Need - Compatibility and use case considerations
First, determine your peak hot water demand. Think about how many hot water appliances you might run simultaneously. A family might run two showers and a dishwasher at the same time. Add up the Gallons Per Minute (GPM) for these fixtures to find your required flow rate. Also, consider the temperature rise needed. This is the difference between your incoming cold water temperature and your desired hot water output (usually 120°F). A higher temperature rise requires a more powerful heater.
Budget - Setting realistic price expectations
Tankless water heaters are a long-term investment. Prices can range from around $250 for smaller, point-of-use models to over $1,500 for high-capacity, whole-house units like the Rinnai. While budget models are great for smaller needs, investing in a mid-range to premium model ($600-$1200) often provides better efficiency, a higher flow rate, and a longer lifespan, leading to greater long-term savings. Don’t forget to factor in the cost of professional installation, which is crucial for safety and warranty.
Key Features - Most important technical specifications
- Flow Rate (GPM): This is the most critical spec. It tells you how many gallons of hot water the unit can produce per minute. Undersizing this will lead to a frustrating lack of hot water.
- BTU Input: British Thermal Units measure the heater’s power. Higher BTUs mean the heater can heat water faster and handle a greater temperature rise.
- Energy Factor (UEF): The Uniform Energy Factor measures efficiency. A higher UEF (closer to 1.0) means more of the fuel is converted into hot water, saving you money on your gas bill. Condensing models typically have the highest UEF ratings.
- Venting: Indoor units require specific venting to safely exhaust combustion gases. Ensure the model you choose is compatible with your home’s venting capabilities or that new venting can be installed.
Quality & Durability - What to look for in construction
Look for heaters with high-quality heat exchangers, as this is the core component. Oxygen-free copper is the industry standard for its excellent thermal conductivity and durability. Some models, like the VELPAX, also feature stainless steel bodies for added corrosion resistance. Check the warranty details; a longer warranty on the heat exchanger (often 5-10 years) is a good indicator of the manufacturer’s confidence in their product.
Brand Reputation - Importance of established manufacturers
Brands like Rinnai and FOGATTI have a long-standing reputation for quality, reliability, and excellent customer support. While newer brands can offer great value and innovative features, established manufacturers often provide more robust warranties and a wider network of certified technicians for installation and service. Reading customer reviews and professional ratings can provide insight into a brand’s long-term performance.
Portability/Size - Considerations for space and storage
One of the main advantages of a tankless heater is its compact size. Measure the space where you plan to install the unit. Most models are wall-mountable and can fit in a small closet, basement, or utility room, freeing up floor space previously occupied by a bulky tank heater. If indoor space is extremely limited, consider a dedicated outdoor model like the FOGATTI 8.1 GPM.
Is it A Wise Decision to Buy tankless water heater natural gas?
Absolutely. Investing in a tankless water heater is one of the smartest upgrades a homeowner can make. While the initial purchase price is higher than a traditional tank heater, the long-term benefits are substantial. The primary advantage is energy efficiency. Traditional tanks constantly burn gas to keep a large volume of water hot, 24/7. A tankless heater only activates when you turn on a hot water tap, which can reduce your water heating energy costs by 24%–34%.
Beyond cost savings, the lifestyle improvement is significant. You get an endless supply of hot water, meaning no more rushing through showers or waiting for a tank to recover. This is a game-changer for families. Furthermore, tankless units are compact, freeing up valuable storage space. They also have a much longer lifespan, typically lasting 20 years or more, compared to the 10-15 year lifespan of a tank heater. When you consider the energy savings, convenience, and longevity, the initial investment pays for itself over time, making it a very wise financial and practical decision for most households.
What Is the Best Way to Choose tankless water heater natural gas?
Choosing the right tankless water heater involves a clear, step-by-step process to ensure you get a model that perfectly matches your home’s needs.
Calculate Your Demand: First, determine your required flow rate (GPM). List the fixtures you’ll use simultaneously (e.g., two showers at 2.5 GPM each = 5 GPM). Next, find your required temperature rise. Check your local groundwater temperature online and subtract it from your desired hot water temperature (e.g., 120°F - 50°F groundwater = 70°F rise). Look at a manufacturer’s chart to find a unit that provides your needed GPM at your required temperature rise.
Check Your Infrastructure: Ensure your home’s natural gas line can supply the necessary BTUs for the model you want. High-BTU heaters may require a larger gas line. Also, assess your venting options. Indoor models need to be vented to the outside, so plan for the vent pipe’s route.
Compare Features and Brands: Once you know your size requirements, compare models based on features like energy efficiency (UEF), warranty, user interface (digital displays, smart controls), and brand reputation. Prioritize a model with a durable copper heat exchanger.
Avoid Common Mistakes: The most common mistake is undersizing the unit. Always size up if you’re between two models. Another error is attempting a DIY installation. Natural gas appliances require professional installation for safety, proper function, and to keep the warranty valid.
Budget vs. Upgrade: While a budget model can work for small applications, investing in a more efficient, higher-capacity unit often provides better long-term value through energy savings and a longer lifespan. Consider it a long-term home improvement investment.
FAQ
What is the best tankless water heater natural gas for beginners?
For someone new to tankless systems, the Ranein 4.3 GPM Indoor Heater is a great starting point. It offers a good balance of performance and user-friendly features like the ‘Four Seasons’ automatic adjustment and preset modes. This removes much of the guesswork and provides a reliable, efficient experience without being overly complex or expensive.
How much should I spend on tankless water heater natural gas?
For a reliable whole-house unit for a typical family, expect to spend between $500 and $1,200. Budget models under $400 are best for smaller apartments or point-of-use needs. Premium, high-capacity models with advanced features from top brands like Rinnai can cost upwards of $1,500. Remember to budget for professional installation as well.
What features are most important in tankless water heater natural gas?
The three most important features are Flow Rate (GPM), BTU output, and the Uniform Energy Factor (UEF). GPM determines how much hot water you can use at once. BTUs indicate heating power. UEF measures efficiency, with higher numbers meaning lower gas bills. A quality heat exchanger (copper is best) is also crucial for longevity.
How do I maintain my tankless water heater natural gas?
Maintenance is relatively simple but important. The primary task is to descale the unit annually (or more often in areas with very hard water) to remove mineral buildup from the heat exchanger. This involves flushing the system with a vinegar solution using a specific service valve kit. You should also have a professional inspect the unit every few years.
Are expensive tankless water heater natural gas worth it?
Yes, often they are. More expensive models from brands like Rinnai or high-end FOGATTI units typically offer higher flow rates, superior energy efficiency (condensing technology), more robust build quality, and longer warranties. The energy savings from a higher UEF can help offset the initial cost over the unit’s 20+ year lifespan, making it a worthwhile long-term investment.
What brands make the best tankless water heater natural gas?
Rinnai is widely considered a top-tier brand known for its reliability, performance, and cutting-edge technology. FOGATTI is another excellent brand that offers powerful and durable units for both indoor and outdoor applications. Brands like Novieex, ThermoMate, and Ranein provide great value and innovative features at more competitive price points.
How long do tankless water heater natural gas typically last?
A well-maintained tankless water heater can last 20 years or even longer. This is a significant advantage over traditional tank heaters, which typically need to be replaced every 10-15 years. The longevity is due to the fact that the components are not constantly exposed to storing corrosive hot water. Regular descaling is key to reaching this lifespan.
Can I find good tankless water heater natural gas on a budget?
Yes, you can. Models like the Ranein 3.6 GPM and VELPAX 4.21 GPM offer the core benefits of tankless heating—endless hot water and energy savings—at a very accessible price. While they may not have the high flow rates or advanced features of premium units, they are excellent, reliable choices for smaller homes, apartments, or budget-conscious buyers.
Final Verdict
After extensive testing and comparison, we confidently recommend the Rinnai RX199iN Condensing Smart Sense Heater as the best overall tankless water heater natural gas.
Its unparalleled versatility for indoor/outdoor and NG/Propane use, combined with a massive 11.1 GPM flow rate and industry-leading .98 UEF efficiency, places it in a class of its own. It’s a premium investment for homeowners who want the absolute best in performance and future-proof technology.
For those on a tighter budget, the Ranein 3.6 GPM Indoor Heater is an unbeatable value, providing reliable on-demand hot water and user-friendly features for smaller homes.
If your priority is maximum power for a large, busy household, the FOGATTI 7.5 GPM Indoor Heater is the clear choice, delivering immense heating capacity to handle any demand you throw at it.
Ultimately, the right choice depends on your specific needs, but upgrading to any of our top picks will transform your home’s hot water experience. Your next step is to calculate your GPM needs and choose the model that fits your home and budget.
Explore our top choice here: Rinnai RX199iN Condensing Smart Sense Heater.
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