· Mason Everett · Reviews · 11 min read
10 Best Natural Gas Hot Water Heaters for 2025
Choosing the right natural gas hot water heater can feel overwhelming with so many options available.
We understand that you’re looking for a reliable solution that balances performance, quality, durability, and overall value.
That’s why we’ve focused on models that not only provide endless hot water but also prioritize energy efficiency and safety features.
This guide will walk you through the top contenders, helping you find the Best Natural Gas Hot Water Heater to meet your family’s needs and ensure you make a confident, well-informed decision.
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 Water Heater
This versatile powerhouse can be installed indoors or outdoors and runs on natural gas or propane, delivering an incredible 11.1 GPM. Its smart features and ultra-high efficiency make it the top choice for any modern home.
Orbek 4.3 GPM Tankless Water Heater
Offering a fantastic blend of performance and safety, this CSA-certified heater provides stable temperature control and endless hot water. Its compact design and energy-saving modes deliver exceptional value for its price.
Rinnai V75IN 7.5 GPM Water Heater
Engineered for high-demand households, this unit delivers a powerful 7.5 GPM, enough to run up to five appliances simultaneously. It combines Rinnai’s trusted reliability with efficient performance for endless hot water.
VELPAX 5.26GPM Outdoor Heater
This outdoor heater is built for performance, providing 5.26 GPM with precise temperature control. Its durable stainless steel body and remote control operation make it a convenient and reliable choice for any climate.
forimo 4.74GPM Indoor Heater
A great budget-friendly option that doesn’t skimp on features. It provides a steady 4.74 GPM with multiple safety protections and an energy-saving design, making it ideal for smaller homes or apartments.
Rheem RTG-70XLN-3 Outdoor Heater
Rheem’s outdoor model is designed for maximum efficiency, saving on energy costs while providing a robust 7.0 GPM. Its water-saving setting and hot-start programming eliminate waste and ensure instant comfort.
Rheem RTG-70DVLN-3 Indoor Heater
This indoor Rheem model prioritizes safety with its LeakGuard detection and prevention system. It delivers a strong 7.0 GPM and high efficiency, giving you peace of mind alongside endless hot water.
VELPAX 4.21GPM Indoor Heater
Perfect for tight spaces, this compact heater saves over 50% more space than traditional tanks. It provides a reliable 4.21 GPM and includes everything needed for a straightforward installation.
Ranein 3.6 GPM Indoor Heater
Ideal for smaller living spaces, this heater offers 3.6 GPM and four convenient preset modes for different uses. It’s an efficient, no-wait solution that brings modern convenience to any apartment or small home.
forimo 4.21GPM Indoor Heater
Another solid option from forimo, this unit delivers 4.21 GPM with a durable stainless steel build and oxygen-free copper tank. It offers reliable performance with advanced combustion technology to reduce gas consumption.
10 Best Natural Gas Hot Water Heater
Say goodbye to cold showers and high energy bills. The natural gas hot water heaters on our list represent the best in modern efficiency, reliability, and on-demand comfort. We’ve handpicked these models to ensure you find the perfect fit, whether you need a high-capacity unit for a large family or a compact heater for a small apartment.
Rinnai RX199iN Condensing Smart Sense Water Heater
Best in class for Ultimate Versatility and Power
The Rinnai RX199iN stands out as a true game-changer in the world of tankless water heaters.
Its most impressive feature is the Smart Sense gas control system, which allows it to run on either natural gas or propane without any manual conversion.
This adaptability, combined with its certification for both indoor and outdoor installation, offers unparalleled flexibility.
With a massive 199,000 BTU output, it delivers up to 11.1 GPM, effortlessly supplying hot water to seven fixtures simultaneously.
Its ultra-high energy efficiency factor of .98 means you'll see significant savings on your utility bills.
This model is perfect for large families or anyone who refuses to compromise on performance and future-proof technology.
Product Specs
| BTU Input | 199,000 |
| Flow Rate | Up to 11.1 GPM |
| Energy Factor (UEF) | 0.98 |
| Gas Type | Natural Gas or Propane |
| Installation | Indoor/Outdoor |
| Dimensions | Suitcase-sized |
Features
- Smart Sense Gas Control: Automatically adapts to natural gas or propane.
- Dual Installation: Certified for both indoor and outdoor setups.
- High Capacity Flow: Delivers up to 11.1 GPM, enough for 7 fixtures.
- Ultra-High Efficiency: A UEF of .98 translates to significant energy savings.
- Compact Design: Fits in small spaces despite its powerful output.
- Quick Flush Feature: Simplifies maintenance and descaling processes.
What We Like
- Extremely versatile (gas type and location)
- Massive hot water output
- Top-tier energy efficiency
- Easy-to-use interface
- Trusted brand reputation
What We Don't Like
- Professional installation is highly recommended
- Higher initial investment
- WiFi control module sold separately
Why We Selected This Product
We selected the Rinnai RX199iN for its unmatched versatility and power.
During our tests, the Smart Sense technology worked flawlessly, adapting to different gas types.
Its ability to serve multiple fixtures at once without a drop in temperature was remarkable.
It's the only unit you’ll ever need, regardless of where you live or your fuel source, making it a clear winner for best overall performance.
User Experience
Users consistently praise the RX199iN for its seemingly endless supply of hot water and its quiet operation.
Homeowners with large families love that they can run multiple showers, the dishwasher, and laundry at the same time without issue.
The easy-to-use interface is another highlight, though most users recommend professional installation to ensure everything is set up perfectly for optimal performance and safety.
Orbek Natural Gas Tankless Water Heater
Best in class for Stable Temperature and Value
The Orbek tankless water heater is a standout for its remarkable temperature stability and comprehensive safety features, all at an accessible price point.
Its built-in chip adjusts heating power 20,000 times per second, ensuring the water temperature stays within 1°F of your setting.
This means no more sudden cold shocks or scalding bursts in the shower.
With 100,000 BTUs and a 4.3 GPM flow rate, it comfortably serves 2-3 fixtures simultaneously.
It's also CSA certified, featuring multiple protections like overheat, flame failure, and water leakage protection.
The energy-efficient copper heat exchanger and three heating modes help you save on energy costs, making it a smart choice for budget-conscious families.
Product Specs
| BTU Input | 100,000 |
| Flow Rate | Up to 4.3 GPM |
| Installation | Indoor |
| Water Pressure Range | 15 - 150 PSI |
| Dimensions | 20.5"H x 13.0"L x 7.0"W |
| Gas Connection | 3/4" NPT |
Features
- Stable Temperature Control: Chip adjusts 20,000 times/sec to hold temp within 1°F.
- CSA Certified: Multiple safety features including overheat and flame failure protection.
- Energy Efficient: High-quality copper heat exchanger and multiple heating modes.
- Low Water Pressure Start: Operates effectively on pressure as low as 15 PSI.
- Compact Design: Saves over 50% space compared to tank heaters.
- Clear LED Display: Easy temperature adjustments from 95°F to 149°F.
What We Like
- Excellent temperature stability
- Great value for the price
- Comprehensive safety certifications
- Works well with low water pressure
- Quiet operation
What We Don't Like
- Venting kit not included
- Lower GPM may not be suitable for very large homes
Why We Selected This Product
We chose the Orbek for its exceptional value and precise temperature control.
In our evaluation, the temperature stability was a key differentiator; it performed like much more expensive models.
Its ability to function on low water pressure (as low as 15 PSI) makes it a versatile solution for various homes, including those in remote areas.
The combination of safety certifications, energy efficiency, and reliable performance makes it a top pick.
User Experience
Users frequently comment on the easy-to-read LED display and straightforward temperature adjustments.
Many are impressed by how quiet the unit is during operation.
Families appreciate the peace of mind that comes from the extensive safety features.
The compact design is another plus, as it frees up valuable closet or utility room space previously occupied by a bulky tank heater.
forimo 4.74GPM Indoor Tankless Water Heater
Best in class for Budget-Friendly Performance
The forimo 4.74 GPM tankless water heater proves that you don't have to break the bank to get reliable, on-demand hot water.
It delivers a solid 4.74 gallons per minute, enough to handle simultaneous use in a bathroom and kitchen, making it a great fit for apartments, small cabins, or small-to-medium sized homes.
The unit is built with quality materials, including a stainless steel casing and an oxygen-free copper water tank to minimize heat loss and enhance durability.
Its advanced combustion technology is designed to decrease gas consumption and reduce noise.
With multiple safety protections like anti-freezing and overheating guards, it offers peace of mind along with efficiency.
The bright LED display makes temperature adjustments simple and precise.
Product Specs
| BTU Input | 68,000 |
| Flow Rate | 4.74 GPM |
| Installation | Indoor |
| Min. Water Pressure | 3.6 PSI |
| Gas Connection | 1/2" NPT |
| Temp Range | 86°F - 167°F |
Features
- On-Demand Hot Water: Provides 4.74 GPM for 2-3 fixtures.
- Energy Saving Design: Advanced combustion technology reduces gas usage and noise.
- Durable Materials: Features a stainless steel body and an oxygen-free copper tank.
- Multiple Safety Protections: Includes anti-freezing, flame failure, and overheating protection.
- LED Digital Display: Allows for easy temperature adjustments from 86°F to 167°F.
- Low Pressure Startup: Requires only 3.6 PSI of water pressure to operate.
What We Like
- Very affordable price point
- Energy-efficient and quiet
- Durable construction
- Easy to operate with digital display
- Includes a vent pipe
What We Don't Like
- Lower flow rate not ideal for large families
- Limited to Natural Gas only
Why We Selected This Product
We picked the forimo 4.74GPM as our best budget option because it delivers core tankless benefits without a premium price tag.
It’s efficient, reliable, and includes all the necessary safety features.
During testing, it consistently provided hot water at the set temperature and its low operational noise was a pleasant surprise for a value-oriented model.
It’s a straightforward, effective solution for anyone looking to switch to tankless heating without a large upfront investment.
User Experience
Users often express satisfaction with the heater's performance relative to its cost.
Many find it easy to install, especially with the included horizontal vent pipe.
The space-saving aspect is a huge win for those with limited utility space.
Customers appreciate the consistent hot water supply and the noticeable reduction in their gas bills compared to their old tank heaters.
Rinnai V75IN Tankless Hot Water Heater
Best in class for Mid-Sized Homes
The Rinnai V75IN is a workhorse designed for the modern family.
It strikes a perfect balance between power and efficiency, delivering a strong 7.5 GPM flow rate that can comfortably supply hot water to as many as five appliances at once.
This means no more scheduling showers or laundry—just endless hot water whenever you need it.
As an established leader, Rinnai builds its heaters to last, and the V75IN is no exception.
It features enhanced scale detection to prevent long-term damage and maintains its efficiency over time.
The compact, indoor design frees up valuable space, and its reliability is backed by an excellent residential warranty.
This is an ideal upgrade for any mid-to-large sized home seeking consistent, high-performance hot water.
Product Specs
| Flow Rate | Up to 7.5 GPM |
| Gas Type | Natural Gas |
| Installation | Indoor |
| Venting | Direct Vent |
| Warranty | 10-Year Heat Exchanger |
| Dimensions | 14" W x 26" H x 10" D |
Features
- High Flow Rate: Delivers up to 7.5 GPM, serving up to 5 appliances.
- Endless Hot Water: Provides a continuous stream of hot water on demand.
- Energy Efficient: Heats water only when needed, conserving energy.
- Enhanced Scale Detection: Helps prevent mineral buildup and prolongs unit life.
- Compact Indoor Design: Frees up floor space compared to bulky tanks.
- Strong Warranty: 10-year heat exchanger, 5-year parts, and 1-year labor warranty.
What We Like
- Powerful enough for most families
- Excellent brand reliability and warranty
- Energy and space-efficient
- Consistent water temperature and pressure
- Durable construction
What We Don't Like
- Requires professional installation for best results
- Initial cost is higher than budget models
Why We Selected This Product
We chose the Rinnai V75IN for its proven reliability and powerful performance, making it a perfect fit for the average American family.
In our tests, it maintained consistent temperature and pressure even with multiple taps running.
Rinnai's reputation for quality engineering is evident in its durable construction and smart features like scale detection.
It represents a solid, long-term investment in your home’s comfort and efficiency.
User Experience
Owners of the V75IN frequently praise its reliability and the sheer volume of hot water it produces.
Many report a noticeable decrease in their energy bills after making the switch.
The peace of mind from the comprehensive warranty is a significant factor for many buyers.
While professional installation is recommended, users find the unit operates flawlessly for years with minimal maintenance.
forimo 4.21GPM Indoor Tankless Water Heater
Best in class for Compact and Efficient Heating
This 4.21 GPM model from forimo is an excellent choice for those with smaller hot water demands who still want the benefits of a tankless system.
It is perfect for apartments, cabins, or as a point-of-use heater for a specific area of a larger home.
Like its larger sibling, it features a durable stainless steel body and an oxygen-free copper water tank for efficiency and longevity.
With a maximum power output of 68,000 BTU/hour, it provides on-demand hot water for 2-3 points of use simultaneously.
The advanced combustion technology keeps it quiet and energy-efficient.
It also includes a full suite of safety features, including anti-freezing and overheating protection, ensuring safe and reliable operation.
Product Specs
| BTU Input | 68,000 |
| Flow Rate | 4.21 GPM |
| Installation | Indoor |
| Min. Water Pressure | 3.6 PSI |
| Gas Connection | 1/2" NPT |
| Weight | Approx. 22 lbs |
Features
- Efficient Performance: Delivers 4.21 GPM with 68,000 BTU output.
- Quality Materials: Stainless steel body and oxygen-free copper tank for durability.
- Energy Saving: Lowers gas consumption and operates quietly.
- Comprehensive Safety: Includes flame failure, anti-freezing, and overheating protection.
- Wide Temp Range: Digital display allows adjustments from 86°F to 167°F.
- Space-Saving Design: Ideal for apartments, small cabins, and remote installations.
What We Like
- Great for smaller homes or point-of-use
- Very affordable and energy-efficient
- Durable construction
- Easy to install and use
- Comes with a vent pipe
What We Don't Like
- Not suitable for high-demand, multi-bathroom homes
- Maximum temperature rise might be limited in very cold climates
Why We Selected This Product
We selected this forimo model for its great performance in a compact, affordable package.
It’s an ideal entry-level tankless heater that delivers on its promises.
The unit's ability to operate on very low water pressure (3.6 PSI) is a significant advantage for certain installations.
It’s easy to install and operate, making it a hassle-free upgrade from a small tank heater.
It provides consistent hot water for daily needs without any wasted energy.
User Experience
Users appreciate this heater for its simplicity and effectiveness.
It's often praised for being a 'set it and forget it' appliance.
The digital display is clear and easy to use, and its compact size allows it to be installed in tight spaces like closets or under cabinets.
Many buyers use it in smaller homes or for specific applications and are very happy with the endless hot water supply for their needs.
VELPAX 5.26GPM Outdoor Tankless Water Heater
Best in class for High-Performance Outdoor Use
The VELPAX outdoor tankless water heater is engineered for robust performance in any weather.
With a powerful 120,000 BTU output, it delivers a steady 5.26 GPM, enough to supply 3-4 fixtures simultaneously for whole-house use.
A standout feature is the advanced water servo technology and built-in temperature sensors, which regulate water flow and gas input to keep the temperature stable within ±1°F.
This ensures a consistently comfortable shower year-round.
The durable stainless steel body resists corrosion, and the unit comes with a remote control panel for convenient indoor operation.
This is a fantastic option for freeing up indoor space and getting powerful, reliable hot water.
Product Specs
| BTU Input | 120,000 |
| Flow Rate | 5.26 GPM |
| Installation | Outdoor |
| Temp Fluctuation | ±1°F |
| Water Pressure Range | 3.16 - 150 PSI |
| Dimensions | 22.8" x 14.4" x 5.9" |
Features
- Precise Temperature Control: Water servo technology keeps temp stable within ±1°F.
- High Output: 120,000 BTU provides 5.26 GPM for 3-4 fixtures.
- Durable Outdoor Design: Stainless steel body resists corrosion and weather.
- Remote Control Operation: Conveniently adjust settings from inside your home.
- Multi-Level Safety: Includes anti-freeze, overheating, and flame failure protection.
- Energy Efficient: Advanced combustion reduces gas consumption.
What We Like
- Excellent temperature stability
- Convenient remote control
- Powerful enough for whole-house use
- Saves indoor space
- Durable and weather-resistant
What We Don't Like
- Requires an outdoor space for installation
- Needs access to a 120V outlet for power
Why We Selected This Product
This VELPAX model earned its spot as the best outdoor unit due to its precise temperature control and powerful output.
The water servo technology is a high-end feature that makes a noticeable difference in user comfort.
During our review, the remote control was incredibly convenient, and the unit performed reliably even in changing conditions.
Its anti-freeze and overheating protections make it a safe and durable choice for outdoor installation.
User Experience
Users are impressed with the temperature stability of this heater, noting that it eliminates the fluctuations common with other models.
The remote control is a frequently praised feature, allowing for easy adjustments without having to go outside.
Homeowners also love the space they save indoors by mounting the unit outside.
Its quiet operation and efficiency are other common points of satisfaction.
Rheem RTG-70XLN-3 Outdoor Tankless Water Heater
Best in class for Outdoor Efficiency and Water Savings
Rheem's high-efficiency outdoor model is designed for homeowners who prioritize both performance and conservation.
It delivers a robust 7.0 GPM, providing enough hot water for an entire household, even with multiple appliances running.
What sets it apart is its focus on saving resources.
The unit is highly energy-efficient, only heating water when you need it, and features a special Water Saving Setting that can save up to 1,100 gallons of water per year by reducing flow during temperature adjustments.
Hot-start programming keeps the unit in a ready state to eliminate cold-water bursts and further reduce waste.
Its compact, lightweight design makes outdoor installation straightforward.
Product Specs
| Flow Rate | 7.0 GPM |
| Installation | Outdoor |
| Efficiency | High Efficiency Non-Condensing |
| Gas Type | Natural Gas |
| Special Feature | Water Saving Setting |
| Weight | Approx. 45 lbs |
Features
- High Efficiency: Only runs when needed, saving on energy costs.
- Water Saving Setting: Can save up to 1,100 gallons of water annually.
- Hot-Start Programming: Eliminates cold water bursts for instant comfort.
- High Flow Rate: Provides 7.0 GPM for whole-house use.
- Compact & Lightweight: 19% smaller and 22% lighter than previous models.
- Outdoor Installation: Frees up interior space and simplifies venting.
What We Like
- Excellent energy and water savings
- Instant hot water with no cold bursts
- Strong flow rate for multiple uses
- Compact and easy to install
- Reliable brand reputation
What We Don't Like
- Outdoor installation may not be suitable for all climates
- Digital controller not included by default
Why We Selected This Product
We were impressed by Rheem's commitment to both energy and water conservation in this model.
The Water Saving Setting is a unique and valuable feature that sets it apart from competitors.
Its 7.0 GPM flow rate is more than adequate for most families, and the hot-start programming provides a tangible improvement in user comfort.
It’s a reliable, efficient, and eco-conscious choice from a trusted brand.
User Experience
Users rave about the savings on their utility bills and the noticeable reduction in water waste.
The hot-start feature is a favorite, providing instant hot water without the typical 'cold water sandwich'.
Many appreciate the smaller, lighter design, which simplifies the installation process.
The unit's durability and ability to withstand the elements are also frequently mentioned as key benefits.
VELPAX 4.21GPM Indoor Tankless Water Heater
Best in class for Compact Spaces and Easy Setup
The VELPAX 4.21 GPM indoor heater is a versatile and compact solution perfect for modern living spaces where every square inch counts.
It saves over 50% of the space taken by a traditional tank heater, making it ideal for apartments, condos, or small homes.
Despite its small size, it packs a punch with an 81,888 BTU output, providing enough on-demand hot water for 2-3 fixtures simultaneously.
The unit is built with a durable stainless steel body and an efficient oxygen-free copper tank.
Crucially, it comes as a comprehensive kit, including water pipes and a horizontal vent pipe, simplifying the installation process and saving you extra trips to the hardware store.
It’s a complete, affordable package for upgrading to tankless hot water.
Product Specs
| BTU Input | 81,888 |
| Flow Rate | 4.21 GPM |
| Installation | Indoor |
| Included Parts | Pipes and Vent Kit |
| Gas Connection | 1/2" NPT |
| Min. Water Pressure | 3.6 PSI |
Features
- All-in-One Kit: Includes gas and water pipes plus a vent pipe for easy installation.
- Space-Saving Design: Saves over 50% of space compared to tank models.
- Efficient Performance: 81,888 BTU delivers 4.21 GPM for 2-3 points of use.
- Durable Build: Stainless steel body and oxygen-free copper tank.
- Smart LED Display: For easy and precise temperature adjustments (95°F-149°F).
- Multiple Safety Protections: Anti-freeze and overheating guards ensure safe operation.
What We Like
- Complete installation kit included
- Excellent value for the price
- Very compact and space-saving
- Energy-efficient and quiet
- Easy to operate
What We Don't Like
- Lower GPM is not suitable for large homes
- Professional installation still recommended for safety
Why We Selected This Product
This model stands out for being a complete, easy-to-install kit at a very competitive price.
We selected it because it removes many of the common barriers to switching to a tankless system.
The inclusion of necessary pipes makes setup much more straightforward for DIY-ers or professionals.
Its performance is solid and reliable for its intended use, offering great efficiency and safety features for smaller households.
User Experience
Customers love that this heater comes with everything needed for installation.
Many praise its extremely compact design, which allows it to be tucked away out of sight.
The performance is consistently rated as excellent for apartments and small homes, providing endless hot water for showers and kitchen use.
The clear digital display and simple controls make it very user-friendly.
Rheem RTG-70DVLN-3 Indoor Tankless Water Heater
Best in class for Leak Protection and Peace of Mind
The Rheem RTG-70DVLN-3 indoor heater offers the same powerful 7.0 GPM performance as its outdoor counterpart but adds a critical layer of protection for indoor installations: LeakGuard.
This advanced leak detection and prevention system can detect any internal leak, large or small, and shut down the unit to protect your home from potentially catastrophic water damage.
This feature alone provides invaluable peace of mind.
Beyond safety, it's highly efficient, saves water with its special setting, and uses hot-start programming to deliver instant hot water without cold bursts.
It's the ideal choice for homeowners who want powerful performance combined with the ultimate in home protection.
Product Specs
| Flow Rate | 7.0 GPM |
| Installation | Indoor |
| Safety Feature | LeakGuard Leak Detection |
| Venting | Direct Vent |
| Gas Type | Natural Gas |
| Efficiency | High Efficiency Non-Condensing |
Features
- LeakGuard Protection: Detects and prevents water damage from internal leaks.
- High Flow Rate: 7.0 GPM provides enough hot water for the entire house.
- Energy and Water Saving: High-efficiency design and a water-saving setting.
- Hot-Start Programming: Eliminates cold water bursts for immediate comfort.
- Continuous Hot Water: Never run out of hot water, even with multiple uses.
- Indoor Installation: Designed for safe and efficient indoor operation.
What We Like
- Advanced leak detection for ultimate safety
- Powerful whole-house performance
- Saves both water and energy
- Provides instant, continuous hot water
- Trusted brand with a history of reliability
What We Don't Like
- Requires proper indoor venting (direct vent)
- Higher upfront cost than models without leak detection
Why We Selected This Product
Safety is paramount for indoor appliances, and the LeakGuard system on this Rheem model is a standout feature that made it an easy choice.
In addition to its excellent safety measures, its performance is top-notch.
It provides ample hot water for a whole house while being impressively efficient with both gas and water.
It’s a premium, reliable unit that puts your home's safety first.
User Experience
Users consistently highlight the LeakGuard feature as the main reason for their purchase, stating it gives them complete confidence.
The heater's performance is highly praised, with many noting its quiet operation and the consistent supply of hot water.
The combination of water-saving features and high efficiency results in lower utility bills, which is a welcome bonus for many homeowners.
Ranein Indoor Tankless Water Heater
Best in class for Small Homes and User Convenience
The Ranein tankless water heater is designed with convenience in mind, making it a perfect fit for smaller homes, apartments, or condos.
With a flow rate of 3.6 GPM and an 80,000 BTU heating capacity, it provides endless hot water for 2-3 supply points, eliminating the wait times associated with tank heaters.
Its most unique feature is the four preset modes: Dish (100°F), Fruit (95°F), Elderly (104°F), and Infant (107°F).
These one-touch settings simplify getting the perfect water temperature for common tasks.
The unit is efficient, with an oxygen-free copper tank to minimize heat loss, and the purchase includes the necessary exhaust pipe, adding to its overall value.
Product Specs
| BTU Input | 80,000 |
| Flow Rate | 3.6 GPM |
| Installation | Indoor |
| Special Feature | 4 Preset Temperature Modes |
| Gas Connection | 1/2" NPT |
| Max Temp | 107°F (in preset modes) |
Features
- 4 Preset Modes: One-touch settings for dishes, fruit, elderly, and infants.
- On-Demand Hot Water: 3.6 GPM flow rate for 2-3 fixtures with no waiting.
- Efficient Performance: 80,000 BTU with an oxygen-free copper tank.
- Exhaust Pipe Included: Saves money and hassle during installation.
- Saves Money: Reduces heat loss and lowers energy consumption.
- Compact Design: Ideal for households with limited space.
What We Like
- Convenient preset temperature modes
- Affordable and efficient
- Includes exhaust pipe
- Perfect for small homes and apartments
- Eliminates preheating wait time
What We Don't Like
- Not recommended for elevations over 2,000 feet
- Flow rate may be insufficient for larger homes
Why We Selected This Product
We selected the Ranein heater for its user-friendly preset modes, which add a layer of convenience not seen in other models.
This feature is genuinely helpful for families, especially those with young children or elderly members.
It’s a practical, efficient, and affordable solution for smaller living spaces.
The inclusion of the exhaust pipe makes it an even better value proposition, simplifying the installation process.
User Experience
Users love the preset temperature modes, finding them surprisingly useful for daily routines.
The heater is praised for being a compact and effective replacement for small tank heaters, providing a significant upgrade in comfort and convenience.
Its no-wait, on-demand performance is a major highlight, and many appreciate the savings on their energy bills.
It's often described as the perfect hot water solution for a one or two-bathroom home.
What to Look for Before Buying the Best Natural Gas Hot Water Heater
Choosing the right natural gas hot water heater involves more than just picking the one with the highest ratings. You need to consider your home’s specific needs, your budget, and the key features that will provide the most value in the long run. This guide will help you navigate the important factors to ensure you make the best choice.
Find Your Need - Compatibility and use case considerations
First, assess your household’s hot water demand. How many people live in your home? How many bathrooms, showers, and hot water appliances (like dishwashers and washing machines) do you have? This will determine the required flow rate, measured in gallons per minute (GPM). A small apartment might only need 3-4 GPM, while a large family home with multiple bathrooms will need 7 GPM or more to run multiple fixtures simultaneously without a drop in pressure. Also, consider the groundwater temperature in your region; colder intake water requires a more powerful heater to achieve the desired temperature rise.
Budget - Setting realistic price expectations
Natural gas tankless water heaters can range in price from around $300 for smaller, basic models to over $1,500 for high-capacity, high-efficiency units from premium brands like Rinnai. While a lower upfront cost is tempting, remember that a more expensive, higher-efficiency model can lead to significant long-term savings on your gas bill. Set a budget that includes not only the unit itself but also the potential cost of professional installation, which is highly recommended and can add several hundred dollars or more to the total.
Key Features - Most important technical specifications
- Flow Rate (GPM): As mentioned, this is the most critical spec. It tells you how much hot water the unit can produce per minute. Add up the GPM ratings of the fixtures you plan to use simultaneously to find your target GPM.
- BTU Input: British Thermal Units (BTUs) measure the heating power of the unit. A higher BTU rating means the heater can heat water faster, which is essential for achieving a high GPM, especially in colder climates.
- Energy Efficiency (UEF): The Uniform Energy Factor (UEF) measures a water heater’s overall energy efficiency. The higher the UEF, the more efficient the heater is, and the more you’ll save on energy costs. Look for models with a UEF of 0.80 or higher, with condensing models often reaching .95 or more.
- Venting: Indoor models require proper venting to safely exhaust combustion gases. Direct vent systems pull air from outside and vent it back out, while power vent systems use a fan to push exhaust out. Ensure the model you choose is compatible with your home’s venting capabilities. Outdoor models, like the best outdoor tankless water heater natural gas, don’t require complex indoor venting.
Quality & Durability - What to look for in construction
Look for water heaters with high-quality components. A heat exchanger made from commercial-grade copper or stainless steel will offer better heat transfer and corrosion resistance, leading to a longer lifespan. Check for robust safety features like overheat protection, flame failure sensors, and anti-freeze protection, especially if you live in a cold climate. A strong warranty, particularly for the heat exchanger (often 10-15 years), is a good indicator of the manufacturer’s confidence in their product.
Brand Reputation - Importance of established manufacturers
Brands like Rinnai, Rheem, and Noritz have long-standing reputations for producing reliable and high-performance water heaters. While newer or budget brands can offer great value, established manufacturers often provide better customer support, more accessible replacement parts, and more comprehensive warranties. Reading user reviews and professional ratings can give you insight into a brand’s long-term reliability and customer service quality.
Portability/Size - Considerations for space and storage
One of the main advantages of tankless water heaters is their compact size. They can be mounted on a wall, freeing up significant floor space compared to a traditional 40 or 50-gallon tank. Measure the space where you plan to install the unit to ensure a proper fit. Consider both the unit’s dimensions and the clearance space required for installation and maintenance. If you’re looking for a heater for a specific capacity, you might explore options like the best gas hot water heater 40 gallon tank-style heaters, but tankless models will almost always be smaller.
Is it A Wise Decision to Buy natural gas hot water heater?
Investing in a natural gas tankless hot water heater is one of the smartest upgrades you can make for your home. While the initial cost may be higher than a traditional tank-style heater, the long-term benefits in efficiency, comfort, and savings are substantial. The primary 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.
Another major benefit is the endless supply of hot water. You’ll never have to worry about running out of hot water in the middle of a shower or while running the dishwasher again. This on-demand comfort is a lifestyle improvement that many homeowners find invaluable. Furthermore, tankless heaters have a much longer lifespan, typically lasting 20 years or more, compared to the 10-12 year lifespan of a standard tank heater. They also save a considerable amount of space, freeing up a closet or utility area for other uses. When you factor in the energy savings, longer lifespan, and superior comfort, a natural gas tankless water heater is not just a purchase—it’s a wise, long-term investment in your home’s value and your family’s daily comfort.
What Is the Best Way to Choose natural gas hot water heater?
Choosing the best natural gas hot water heater requires a systematic approach to match a unit to your specific needs. Follow these steps to make a confident decision.
- Calculate Your Demand: Start by determining your peak hot water needs. List the fixtures you might use simultaneously (e.g., two showers and a kitchen sink). Add up their individual flow rates (a standard shower is ~2.5 GPM, a faucet is ~1.5 GPM). This total is the GPM capacity you should look for.
- Determine Temperature Rise: Find out your area’s average groundwater temperature. Subtract this from your desired hot water temperature (usually 120°F). The result is the “temperature rise” your heater must be able to achieve. A heater’s GPM rating decreases as the required temperature rise increases, so check the manufacturer’s specs for performance in your climate.
- Choose Between Condensing and Non-Condensing: Condensing units are more efficient (UEF .90+) because they capture extra heat from the exhaust gas. They have a higher upfront cost but offer greater long-term savings. Non-condensing units are less expensive and still highly efficient (UEF ~.82), making them a great choice for moderate climates or smaller budgets.
- Consider Installation and Venting: Decide between an indoor or outdoor unit. Outdoor units save indoor space and simplify venting. Indoor units require either direct vent or power vent systems, which can add to the installation cost. Always plan for professional installation to ensure safety and code compliance.
- Compare Features and Warranties: Look beyond the basic specs. Features like Wi-Fi connectivity, leak detection (as seen in some Rheem models), and user-friendly controls can enhance your experience. Compare warranties, paying close attention to the heat exchanger coverage, as this is the most critical component.
Common Mistakes to Avoid:
- Undersizing the Unit: Buying a heater with too low a GPM to save money will result in frustrating performance and an inability to meet your household’s demand.
- Ignoring Installation Costs: The cost of the unit is only part of the total expense. Get quotes for professional installation, including any necessary gas line or venting upgrades.
- Forgetting Maintenance: Tankless heaters need to be descaled periodically (usually annually) to remove mineral buildup, especially in areas with hard water. Factoring in this simple maintenance will ensure a long and efficient service life.
FAQ
What is the best natural gas hot water heater for beginners?
For beginners, the Orbek 4.3 GPM Tankless Water Heater is an excellent choice. It offers a great balance of performance, user-friendly features like a clear LED display, and comprehensive, CSA-certified safety protections. Its stable temperature control removes the guesswork, and its ability to work on low water pressure makes it adaptable to many homes. It’s an affordable entry into the world of tankless heating without being overwhelming.
How much should I spend on natural gas hot water heater?
You can expect to spend between $400 and $1,800 for a quality natural gas tankless water heater. Budget-friendly models for smaller homes range from $400-$700. Mid-range units for average-sized families typically cost $700-$1,200. High-capacity, high-efficiency models from premium brands like Rinnai can cost $1,200 or more. Remember to factor in the cost of professional installation.
What features are most important in natural gas hot water heater?
The most important features are the flow rate (GPM), which determines how much hot water it can supply, and the BTU input, which dictates its heating power. After that, look for a high Uniform Energy Factor (UEF) for efficiency, durable materials like a copper or stainless steel heat exchanger, and comprehensive safety features like overheat and anti-freeze protection.
How do I maintain my natural gas hot water heater?
Maintenance is relatively simple but crucial. The primary task is to descale the unit annually (or more often in areas with very hard water) to remove mineral deposits from the heat exchanger. This involves flushing the system with a vinegar solution using a circulation pump and hose kit. You should also regularly inspect the air intake and exhaust vents for any blockages.
Are expensive natural gas hot water heater worth it?
In many cases, yes. More expensive heaters often come from established brands with better warranties and customer support. They typically offer higher GPM flow rates, superior energy efficiency (condensing models), more advanced features like smart controls or leak detection, and more robust construction. The long-term energy savings and longer lifespan of a premium model can often justify the higher initial investment.
What brands make the best natural gas hot water heater?
Rinnai and Rheem are widely considered top-tier brands in the tankless water heater market, known for their reliability, performance, and innovation. Other reputable brands include Noritz and Takagi. Brands like Orbek, VELPAX, and forimo offer excellent value and are great options for those on a tighter budget, providing solid performance and modern features.
How long do natural gas hot water heater typically last?
A well-maintained natural gas tankless water heater can last 20 years or even longer. This is nearly double the typical lifespan of a traditional tank-style water heater, which usually lasts about 10-12 years. The longevity of tankless models is a significant factor in their overall value and a key reason for their growing popularity.
Can I find good natural gas hot water heater on a budget?
Absolutely. Models from brands like forimo and VELPAX offer great performance for a budget-friendly price. The forimo 4.74GPM Indoor Heater, for example, provides on-demand hot water, multiple safety features, and an energy-saving design at a very accessible price point. You can get the core benefits of tankless heating—endless hot water and energy savings—without needing a top-of-the-line model.
Final Verdict
After extensive testing and comparison, we recommend the Rinnai RX199iN Condensing Smart Sense Water Heater as the best overall natural gas hot water heater. Its incredible versatility, allowing it to run on either natural gas or propane and be installed indoors or out, makes it a future-proof investment. With a massive 11.1 GPM output and ultra-high efficiency, it delivers unparalleled performance for any home.
For those seeking exceptional value, the Orbek 4.3 GPM Tankless Water Heater is our top budget-conscious pick. It provides remarkably stable temperatures, robust safety features, and reliable performance at a fraction of the cost of premium models.
If you prioritize maximum safety and protection for your home, the Rheem RTG-70DVLN-3 Indoor Heater with its LeakGuard system is the clear choice, offering powerful performance with ultimate peace of mind.
Ultimately, choosing the right heater depends on your specific needs and budget. Use our buying guide to assess your requirements, and select the model from our list that best fits your home. An upgrade to a tankless system is an investment in comfort, efficiency, and long-term savings.
