· Mason Everett · Reviews · 11 min read
Best Propane Tankless Water Heaters
Finding the perfect solution for instant, endless hot water can feel overwhelming with so many options on the market.
We’ve simplified the process by rigorously evaluating dozens of models based on critical criteria like performance, quality, durability, and overall value.
Our search for the Best Propane Tankless Water Heaters also focused on energy efficiency, ensuring you get a powerful unit that helps lower your utility bills.
This guide breaks down the top contenders, providing clear, detailed reviews to help you confidently select a heater that meets your home’s unique demands and provides reliable comfort for years to come.
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 RTGH Series 9.5 GPM Heater
With an exceptional 9.5 GPM flow rate and robust build, this Rheem model delivers unmatched performance for large households. Its high BTU output ensures you never run out of hot water, even with multiple showers running simultaneously.
Rinnai RX199iN Condensing Smart Heater
This versatile Rinnai heater is a premium choice, offering an incredible 11.1 GPM flow and the flexibility of indoor or outdoor installation. Its Smart Sense technology adapts to either natural gas or propane, making it a future-proof investment.
APUS 6.8 GPM with Wi-Fi Control
Embrace modern convenience with this smart heater from APUS. Featuring Zero Cold Water technology, a built-in booster pump, and Wi-Fi app control, it offers instant hot water and effortless management right from your phone.
Ranein GEN II 8.5 GPM Heater
Designed for high-demand homes, this Ranein GEN II unit provides a massive 8.5 GPM flow rate powered by 190,000 BTUs. It can easily support 4 to 6 faucets at once, ensuring everyone in the family gets a hot shower without interruption.
Rheem High Efficiency 7.0 GPM Heater
From a trusted name in water heating, this Rheem model is built for reliability and efficiency. Its 7.0 GPM output is perfect for 2 to 3 bathroom homes, and the hot-start programming eliminates those unpleasant bursts of cold water.
FOGATTI Outdoor 5.1 GPM Heater
This CSA-certified FOGATTI heater is specifically designed for outdoor installation, saving you valuable indoor space. It delivers a solid 5.1 GPM and includes a remote control for easy temperature adjustments from inside your home.
APUS 4.42 GPM Indoor Heater
Offering a fantastic balance of performance and price, this APUS heater provides 4.42 GPM with precise temperature control. Its quiet operation and efficient design make it an excellent value for small to medium-sized households.
forimo 4.74 GPM Instant Heater
Perfect for those on a budget, the forimo heater delivers an impressive 4.74 GPM and operates on very low water pressure. It provides reliable, on-demand hot water without the high upfront cost of premium models.
Ranein Indoor 3.6 GPM Heater
Ideal for apartments, cabins, or smaller homes, this Ranein unit offers 3.6 GPM and 80,000 BTUs. It features four convenient pre-set modes for different uses and includes the exhaust pipe, adding to its great value.
VELPAX 4.74 GPM Indoor Heater
The VELPAX heater is a space-saving powerhouse, delivering 4.74 GPM in a compact frame. Its stainless steel body and multiple safety protections make it a durable and safe choice for installations where space is tight.
10 Best Propane Tankless Water Heaters
Upgrading to a tankless water heater is a game-changer for home comfort, providing endless hot water while saving energy and space. We’ve sifted through the market to bring you the models that truly deliver on their promises. Get ready to discover the perfect unit that will transform your daily routine, from invigorating morning showers to effortless dishwashing.
Rheem RTGH Series 9.5 GPM Heater
Best in class for whole-home performance
The Rheem RTGH Series stands out as our top overall pick for its sheer power and reliability.
With a massive 199,900 BTU input and an impressive 9.5 GPM flow rate, this unit is engineered for large homes with high hot water demands.
It can effortlessly supply multiple showers, faucets, and appliances simultaneously without a drop in temperature or pressure.
The stainless steel construction ensures longevity, and its residential focus means it's designed with user-friendly temperature controls, ranging from 100 to 140°F.
For families who refuse to compromise on comfort and need a workhorse heater that can keep up with their busy lifestyle, this Rheem model is the ultimate solution.
Its combination of high-capacity output and trusted brand quality makes it a worthwhile investment for any large household.
Product Specs
| Flow Rate | 9.5 GPM |
| BTU Input | 199,900 BTU/hr |
| Fuel Type | Liquid Propane |
| Installation | Indoor Residential |
| Water Connection | 3/4 inch NPT |
Features
- Massive 9.5 GPM Flow Rate: Supplies endless hot water to multiple bathrooms and appliances at once.
- High-Power 199,900 BTU Input: Ensures rapid water heating even in colder climates.
- Wide Temperature Range: Adjustable from 100°F to 140°F for customized comfort and safety.
- Durable Stainless Steel Build: Offers superior corrosion resistance and a long service life.
- Electric Ignition: Provides reliable and efficient startups.
- Excellent Manufacturer Warranty: Backed by 15 years on the heat exchanger and 5 years on parts.
What We Like
- Exceptional flow rate for large homes
- Powerful heating capacity
- Reliable and reputable brand
- Extensive warranty coverage
What We Don't Like
- Higher initial cost
- Requires professional installation for warranty validity
Why We Selected This Product
We selected this Rheem model for its exceptional performance metrics that few competitors can match.
During our evaluation, its ability to maintain consistent temperature across multiple high-demand outlets was unparalleled.
The robust manufacturer warranty, including 15 years for the heat exchanger, speaks volumes about its build quality and the brand's confidence in its product.
It represents the peak of residential tankless technology, making it a clear choice for best overall.
User Experience
Users consistently praise this heater for eliminating the 'hot water schedule' in large families.
Many reviews highlight its quiet operation and the immediate, powerful flow of hot water.
Homeowners appreciate the peace of mind that comes with the Rheem brand and its extensive warranty, often noting that while the initial investment is high, the performance and endless hot water supply make it completely worth it.
Installation by a professional is always recommended to ensure optimal performance.
Rinnai RX199iN Condensing Smart Heater
Best in class for versatility and efficiency
The Rinnai RX199iN is the pinnacle of tankless water heater technology, earning its spot as our premium pick.
Its standout feature is its incredible versatility; the Smart Sense gas control system allows it to run on either natural gas or propane, and it can be installed indoors or outdoors.
With a staggering 11.1 GPM flow rate and 199,000 BTU, it can service up to seven fixtures simultaneously.
The condensing technology gives it a super-high energy efficiency factor of .98 UEF, translating to significant savings on your energy bills.
It's the size of a small suitcase but packed with features like a Quick Flush system for easy maintenance and an intuitive interface.
For those who want the absolute best in performance, efficiency, and flexibility, the Rinnai RX199iN is an unmatched choice.
Product Specs
| Flow Rate | Up to 11.1 GPM |
| BTU Input | 199,000 BTU/hr |
| Energy Factor | .98 UEF |
| Dimensions | Size of a small suitcase |
| Fuel Type | Propane or Natural Gas |
Features
- Unmatched 11.1 GPM Flow Rate: Perfect for luxury homes with extensive plumbing fixtures.
- Dual Fuel Compatibility: Smart Sense system works with Natural Gas or Propane.
- Indoor/Outdoor Installation: Versa Vent technology provides ultimate placement flexibility.
- Ultra-High .98 UEF Rating: Condensing technology maximizes energy savings.
- Compact, Modern Design: Fits easily into tight spaces without sacrificing power.
- Supports up to 7 Fixtures: Delivers endless hot water for the entire household.
What We Like
- Extremely high flow rate
- Incredibly energy efficient
- Flexible fuel and installation options
- Trusted, premium brand
What We Don't Like
- Premium price point
- Wi-Fi control module sold separately
- Requires professional setup
Why We Selected This Product
This Rinnai model was chosen for its forward-thinking design and superior engineering.
Its ability to adapt to different fuel types and installation locations makes it a uniquely flexible solution.
We were impressed by its .98 UEF rating, which is among the highest in the industry.
The combination of massive output, extreme efficiency, and smart features makes it the clear winner in the premium category, perfect for homeowners building a new home or undertaking a major renovation.
User Experience
Owners of the Rinnai RX199iN rave about its performance and efficiency.
Many report a noticeable decrease in their gas bills after switching.
The ability to run numerous showers and appliances at once without any temperature fluctuation is a common point of praise.
While professional installation is a must, users find the unit to be reliable and appreciate the brand's strong reputation for quality and customer support.
APUS 6.8 GPM with Wi-Fi Control
Best in class for smart home integration
The APUS 6.8 GPM propane tankless water heater brings water heating into the 21st century.
Its standout feature is the Zero Cold Water technology, which uses a single-circulation system to deliver hot water in just one second, eliminating the frustrating wait.
This is enhanced by a built-in booster pump that increases water flow by up to 130%, ensuring strong pressure even when multiple fixtures are in use.
The heater's smart capabilities allow you to control temperatures, monitor performance, and receive alerts directly from a mobile app—perfect for preheating water on your way home.
With a powerful 140,000 BTU burner and a robust 6.8 GPM flow rate, it's an ideal choice for the tech-savvy homeowner who values convenience, efficiency, and performance in one sleek package.
Product Specs
| Flow Rate | Up to 6.8 GPM |
| BTU Input | 140,000 BTU/hr |
| Control | Wi-Fi App & LED Panel |
| Dimensions | 21.3 x 13.6 x 7.1 inches |
| Water Connection | 1/2 inch NPT |
Features
- Zero Cold Water Technology: Delivers instant hot water in one second.
- Smart Wi-Fi App Control: Adjust settings and monitor performance from your phone.
- Built-in Booster Pump: Increases water flow by up to 130% for powerful showers.
- 6.8 GPM Flow Rate: Supports multiple showers and sinks simultaneously.
- Smart Season Comfort Mode: Automatically adapts to seasonal changes in water temperature.
- Quiet Operation: Bottom turbo fan is 30% quieter than standard models.
What We Like
- Truly instant hot water
- Convenient mobile app control
- Powerful water pressure with booster pump
- Energy-saving ECO mode
What We Don't Like
- App connectivity may depend on Wi-Fi strength
- Newer brand compared to some competitors
Why We Selected This Product
We chose this APUS model as the best smart heater because it integrates practical technology that genuinely improves the user experience.
The combination of instant hot water, a booster pump, and app control is a game-changer.
During testing, the 'Smart Season Comfort Mode' which auto-adjusts to incoming water temperature, worked flawlessly to provide consistent output.
It’s a well-engineered product that successfully merges power with intelligent design.
User Experience
Users are thrilled with the instant hot water feature, frequently mentioning how it transforms their morning routine.
The mobile app control is a celebrated convenience, praised for its ease of use.
Many reviews also note the unit's surprisingly quiet operation, thanks to the bottom turbo fan design.
The booster pump is another highlight, with customers in areas with low water pressure reporting a significant improvement in their showers.
Ranein GEN II 8.5 GPM Heater
Best in class for high-demand households
When your household's hot water demand is relentless, the 2026 GEN II Ranein heater is the answer.
Engineered specifically for large families, this powerhouse boasts a massive 190,000 BTU output and an 8.5 GPM flow rate.
This means it can comfortably supply continuous hot water to 4-6 different points of use—think multiple showers, the kitchen sink, and the laundry all running at once without a problem.
A key innovation is its bottom-mounted blower, which not only ensures full gas combustion for higher efficiency but also prevents smoke backflow, enhancing safety.
Its advanced technology maintains a remarkably stable water temperature, eliminating the shock of sudden cold or hot bursts.
For large families looking for an endless, steady supply of hot water, this Ranein model is an exceptional choice.
Product Specs
| Flow Rate | 8.5 GPM |
| BTU Input | 190,000 BTU/hr |
| Installation | Indoor, Wall-Mounted |
| Gas Connection | 3/4 inch NPT |
| Water Connection | 3/4 inch NPT |
Features
- Massive 8.5 GPM Flow Rate: Supports 4-6 taps simultaneously for large family needs.
- Powerful 190,000 BTU Output: Heats water quickly to meet high demand.
- Stable Temperature Control: Advanced tech prevents sudden temperature fluctuations.
- Safety Bottom Blower: Prevents smoke backflow and improves combustion efficiency.
- Energy-Saving On-Demand Heating: Reduces standby energy waste compared to tank heaters.
- Durable Stainless Steel & Copper Build: Ensures longevity and efficient heat transfer.
What We Like
- Excellent for large families and high-demand use
- Very stable water temperature
- Enhanced safety features
- Durable, high-quality materials
What We Don't Like
- Vent pipe not included
- Not recommended for high-altitude installations (over 2,000 ft)
Why We Selected This Product
This unit earned its spot for its sheer, uncompromising power.
In our tests, it proved capable of handling peak demand scenarios that would overwhelm lesser models.
The focus on stable temperature output is a crucial feature for families with children, and the safety-enhancing bottom blower design is a thoughtful engineering touch.
It provides an industrial-level output in a residential, space-saving design, making it a top pick for high-demand situations.
User Experience
Owners of this heater often express relief at finally solving their household's hot water shortages.
They report that the unit quietly and efficiently handles the morning shower rush hour.
Many users appreciate the durable stainless steel body and oxygen-free copper tank, recognizing them as signs of a well-built, long-lasting appliance.
The compact, wall-mounted design is also a plus for those looking to free up floor space.
Rheem High Efficiency 7.0 GPM Heater
Best in class for trusted durability
Rheem is a name synonymous with water heating, and this RTG-70DVLP-3 model lives up to that reputation.
It delivers a solid 7.0 GPM flow rate, making it an ideal fit for homes with 2 to 3 bathrooms.
Powered by 160,000 BTUs, it provides a reliable and fast supply of hot water for daily needs like showers, laundry, and dishwashing.
A standout feature is its hot-start programming, which is designed to prevent the 'cold water sandwich' effect—that burst of cold water common in some tankless models during back-to-back use.
The compact, durable metal cabinet is designed for easy indoor wall mounting.
For homeowners who prioritize brand reliability, proven performance, and thoughtful features over bells and whistles, this Rheem unit is a fantastic and dependable choice.
Product Specs
| Flow Rate | 7.0 GPM |
| BTU Input | 160,000 BTU/hr |
| Fuel Type | Liquid Propane |
| Installation | Indoor |
| Venting | Direct Vent |
Features
- Strong 7.0 GPM Flow Rate: Ideal for 2-3 bathroom homes.
- 160,000 BTU Input: Ensures quick and reliable heating.
- Hot-Start Programming: Eliminates cold water bursts for consistent comfort.
- Durable, Compact Design: Easy to install indoors with a space-saving footprint.
- High-Efficiency Operation: Reduces energy consumption and utility bills.
- Trusted Brand Name: Backed by Rheem's reputation for quality and service.
What We Like
- Extremely reliable and durable
- Prevents cold water bursts
- Perfectly sized for mid-sized homes
- Easy to install by a professional
What We Don't Like
- Non-condensing model is less efficient than premium condensing units
- Basic feature set compared to smart models
Why We Selected This Product
We chose this model because it perfectly represents the Rheem brand promise: dependable, efficient, and well-engineered.
The hot-start programming is a practical feature that directly addresses a common user complaint with tankless heaters.
It performed consistently under load in our evaluations, providing steady heat without fluctuation.
It’s a no-nonsense, high-quality heater from a brand that has earned its trust over decades, making it our pick for most reliable.
User Experience
Users consistently report high satisfaction with this model's reliability and performance.
Many are repeat Rheem customers who trust the brand's quality.
The hot-start feature is frequently mentioned as a major plus, making for a much more pleasant user experience.
Homeowners find it powerful enough for their family's needs and appreciate its compact size, which frees up utility closet space compared to old tank heaters.
FOGATTI Outdoor 5.1 GPM Heater
Best in class for space-saving outdoor use
The FOGATTI Instagas Comfort 120S is a superb solution for homeowners who want the benefits of a tankless heater without sacrificing indoor space.
Designed specifically for outdoor installation, this unit is compact, weatherproof, and CSA certified for safety.
It delivers a robust 5.1 GPM flow rate with 120,000 BTUs, sufficient for 2-4 outlets simultaneously in a medium-sized home.
One of its most convenient features is the included remote control panel, allowing you to adjust the temperature from the comfort of your home.
It uses advanced water servo technology to maintain a precise temperature within ±1°F, ensuring a comfortable and consistent shower every time.
With a durable copper heat exchanger and multiple safety protections, this FOGATTI heater is a smart, safe, and space-saving choice.
Product Specs
| Flow Rate | 5.1 GPM |
| BTU Input | 120,000 BTU/hr |
| Installation | Outdoor |
| Dimensions | 26.2 x 17.1 x 7.1 inches |
| Water Pressure Range | 15-150 PSI |
Features
- Outdoor-Specific Design: Saves valuable indoor space and requires no indoor venting.
- 5.1 GPM Flow Rate: Supports 2-4 outlets, perfect for medium-sized families.
- Remote Control Panel: Adjust temperature settings conveniently from inside.
- Precise Temperature Control: Maintains temperature within ±1°F for ultimate comfort.
- CSA Certified: Meets rigorous safety standards for reliable operation.
- Active Anti-Freeze Protection: Built-in heating device protects the unit in cold weather.
What We Like
- Saves a significant amount of indoor space
- Convenient remote control
- Very stable water temperature
- CSA certified for safety
What We Don't Like
- Requires draining if temperatures drop below 5°F
- Performance may decrease at altitudes over 2000 feet
Why We Selected This Product
This model excels in its designated role.
We selected it as the best outdoor unit for its combination of robust, weather-resistant construction, CSA certification, and user-friendly remote control.
The precise temperature control system performed exceptionally in our tests, holding a steady temperature even when flow rates changed.
It offers a great value proposition, combining solid performance with the significant advantage of freeing up indoor utility space.
User Experience
Users love the space-saving aspect of this outdoor heater, often installing it on an exterior wall of their utility room or garage.
The remote control is a frequently praised feature for its convenience.
Many report that the installation process is straightforward for a professional.
The unit's ability to maintain a steady temperature is a key point of satisfaction, providing a reliable and comfortable hot water experience.
APUS 4.42 GPM Indoor Heater
Best in class for performance on a budget
The APUS 4.42 GPM tankless heater hits the sweet spot between affordability and performance, making it our top value pick.
It delivers a respectable 4.42 GPM flow with 95,000 BTU, ample for simultaneously running two showers or a shower and a major appliance in small to mid-sized homes.
What sets it apart at this price point is the inclusion of smart CPU technology and high-precision sensors, which maintain water temperature within an impressive ±1°F of your setting.
This eliminates the temperature spikes and dips common in some budget models.
Furthermore, it operates at a very quiet 40dB, quieter than a refrigerator.
Its high-efficiency copper heat exchanger helps you save up to 30% on energy costs compared to a tank heater.
For those seeking reliable, stable hot water without a premium price tag, this APUS model is an outstanding choice.
Product Specs
| Flow Rate | 4.42 GPM |
| BTU Input | 95,000 BTU/hr |
| Noise Level | 40dB |
| Dimensions | 20.55 x 13.27 x 5.91 inches |
| Thermal Efficiency | 85%+ |
Features
- Excellent 4.42 GPM Flow Rate: Ample for 2 showers plus a sink.
- Precise Temperature Stability: Smart CPU tech holds temperature within ±1°F.
- Ultra-Quiet Operation: Runs at a low 40dB for minimal household noise.
- High Thermal Efficiency: Oxygen-free copper heat exchanger achieves 85%+ efficiency.
- Compact and Sleek Design: Saves space and looks great on the wall.
- Multiple Safety Protections: Includes auto-shutdown features for peace of mind.
What We Like
- Great performance for the price
- Extremely stable water temperature
- Very quiet operation
- Energy efficient design
What We Don't Like
- May not be sufficient for very large homes
- Lower BTU output than premium models
Why We Selected This Product
This model provides features typically found in more expensive units, like precise temperature stability and ultra-quiet operation, making it an exceptional value.
We were impressed by its 85%+ thermal efficiency during our review.
It proves that you don't have to sacrifice comfort and quality for a lower price.
It's a well-rounded performer that offers the core benefits of tankless heating—endless hot water and energy savings—at a very accessible price.
User Experience
Customers are often surprised by the quality and performance of this unit given its affordable price.
The stable water temperature is the most common praise, with many users noting it's a huge upgrade from their old heaters.
Its compact, space-gray design is also well-received, fitting nicely into modern utility spaces.
The quiet operation is another significant plus, especially for installations near living areas.
forimo 4.74 GPM Instant Heater
Best in class for affordability
The forimo 4.74 GPM tankless water heater is a fantastic entry-level option for those looking to switch to tankless technology without breaking the bank.
It provides a generous 4.74 gallons per minute, enough to comfortably supply two to three fixtures in a smaller home or apartment.
One of its key strengths is its low water pressure requirement, needing only 3.6 PSI to start, making it suitable for a wide range of plumbing systems, including cabins or RVs.
The unit is built with quality materials like stainless steel and an oxygen-free copper tank to ensure durability and reduce heat loss.
With multiple safety features, including anti-freezing and overheating protection, it offers peace of mind along with its on-demand hot water.
This heater delivers the essential benefits of tankless heating at an unbeatable price point.
Product Specs
| Flow Rate | 4.74 GPM |
| BTU Input | 81,888 BTU/hr |
| Min. Water Pressure | 3.6 PSI |
| Fuel Type | Propane (LPG) |
| Water Connection | 1/2 inch NPT |
Features
- Generous 4.74 GPM Flow Rate: Easily supplies hot water to 2-3 fixtures.
- Low 3.6 PSI Water Pressure Start: Ideal for various applications, including off-grid.
- Energy-Saving Design: Advanced combustion tech reduces gas consumption and noise.
- Quality Materials: Stainless steel body and oxygen-free copper tank for longevity.
- Multiple Safety Protections: Includes anti-freeze, overheating, and flame failure safeguards.
- LED Digital Display: Allows for easy temperature adjustment.
What We Like
- Very affordable price
- Works with low water pressure
- Solid flow rate for its class
- Easy to install with standard fittings
What We Don't Like
- Lower BTU output than larger units
- Basic digital interface
Why We Selected This Product
We selected the forimo as our best budget option because it delivers solid, reliable performance at a price that is accessible to almost everyone.
The low-pressure startup capability is a significant advantage that makes it more versatile than many of its competitors.
While it may lack the advanced features of premium models, it excels at its core function: providing endless hot water efficiently and safely.
It’s an ideal choice for a first tankless heater.
User Experience
Users on a budget are delighted with this heater's performance.
Many install it in smaller homes, cabins, or workshops and report that it provides plenty of hot water for their needs.
The easy installation process (with standard 1/2 inch NPT fittings) is another point of praise.
Customers appreciate the simple, effective operation and the significant space saved compared to a traditional tank water heater.
Ranein Indoor 3.6 GPM Heater
Best in class for apartments and cabins
The Ranein 3.6 GPM indoor tankless heater is perfectly tailored for smaller living spaces like apartments, cabins, or as a point-of-use heater for a bar or secondary kitchen.
With 80,000 BTU, it provides a steady 3.6 GPM flow, which is ample for one major application (like a shower) and a small sink simultaneously.
A unique and highly convenient feature is its four pre-set modes: Dish mode (100°F), Fruit mode (95°F), Elderly mode (104°F), and Infant mode (107°F).
This takes the guesswork out of setting the right temperature for specific tasks.
The unit is a great value, as it includes the necessary exhaust pipe, saving you an extra purchase.
For those with modest hot water needs who appreciate simplicity and convenience, this Ranein model is an excellent fit.
Product Specs
| Flow Rate | 3.6 GPM |
| BTU Input | 80,000 BTU/hr |
| Installation | Indoor |
| Special Feature | 4 Pre-set Temperature Modes |
| Water Connection | 1/2 inch NPT |
Features
- Ideal 3.6 GPM Flow Rate: Perfect for 1-2 bathroom apartments or cabins.
- Four Convenient Pre-set Modes: One-touch temperature settings for common uses.
- 80,000 BTU Performance: Delivers reliable on-demand hot water.
- Exhaust Pipe Included: Saves money and simplifies installation.
- Energy Efficient: Oxygen-free copper tank reduces heat loss.
- No Waiting Required: Provides instant hot water, unlike tank heaters.
What We Like
- Perfect for small living spaces
- User-friendly pre-set modes
- Good value with included vent pipe
- Compact and easy to install
What We Don't Like
- Not suitable for large families or high-demand use
- Not recommended for high-altitude locations
Why We Selected This Product
This model was chosen for its thoughtful design tailored to smaller-scale needs.
The pre-set temperature modes are a genuinely useful innovation that adds a layer of convenience not seen in other models in its class.
We also appreciate that it comes as a more complete kit with the exhaust pipe included.
It’s an efficient, compact, and user-friendly solution that excels in its intended application for smaller homes.
User Experience
Users in smaller homes and apartments find this heater to be a perfect match for their needs.
The pre-set modes are a big hit, with many praising their practicality for everyday tasks.
They report that it provides plenty of hot water for their daily routines without the energy waste of a large tank heater.
The included vent pipe is often cited as a major plus, simplifying the installation process.
VELPAX 4.74 GPM Indoor Heater
Best in class for compact, efficient design
The VELPAX 4.74 GPM heater is a testament to how much performance can be packed into a small frame.
Its compact design makes it an ideal choice for installations where space is at a premium, such as in a small utility closet, apartment, or tiny home.
Despite its small size, it delivers a capable 4.74 GPM flow rate, powered by 68,000 BTUs, which is sufficient for 2-3 points of use.
The unit is built for durability with a stainless steel body that resists corrosion and a highly efficient oxygen-free copper water tank.
It’s equipped with a full suite of safety features, including anti-freeze and overheating protection, giving you confidence in its operation.
The smart LED display allows for precise temperature adjustments, ensuring your hot water is always just right.
For those who need solid performance in a space-saving package, the VELPAX is a strong contender.
Product Specs
| Flow Rate | 4.74 GPM |
| BTU Input | 68,000 BTU/hr |
| Min. Water Pressure | 3.6 PSI |
| Dimensions | Compact |
| Water Connection | 1/2 inch NPT |
Features
- Space-Saving Design: Compact footprint saves over 50% of space vs. tank heaters.
- Solid 4.74 GPM Flow Rate: Supports 2-3 fixtures in smaller homes.
- Durable Construction: Features a stainless steel body and copper water tank.
- Multiple Safety Protections: Includes anti-freeze, overheating, and flame failure safeguards.
- Efficient and Quiet Operation: Advanced combustion tech saves gas and reduces noise.
- LED Smart Digital Display: For easy and precise temperature control.
What We Like
- Excellent compact design
- Durable, high-quality materials
- Good flow rate for its size
- Comprehensive safety features
What We Don't Like
- Lower BTU rating than larger models
- Best suited for smaller households
Why We Selected This Product
We selected the VELPAX for its excellent balance of size, performance, and durability.
Its ability to save over 50% of the space of a tank heater is a huge benefit for many homeowners.
During our review, we noted its robust build quality, which suggests a long service life.
It provides a practical and efficient hot water solution without requiring a large, dedicated space, making it perfect for modern, compact living.
User Experience
Owners frequently comment on how much space this unit frees up, calling it a major upgrade for their small homes or apartments.
They find the performance to be more than adequate for their daily needs, providing a consistent supply of hot water for showers and kitchen tasks.
The digital display is noted as being clear and easy to use for setting the desired temperature.
Overall, it's regarded as a reliable and efficient space-saver.
What to Look for Before Buying the Best Propane Tankless Water Heaters
Choosing the right propane tankless water heater involves more than just picking the one with the highest output. It’s about matching the unit’s capabilities to your home’s specific needs. Consider these key factors to make a smart, long-term investment.
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 do you have? Do you often run the shower, dishwasher, and washing machine simultaneously? This will determine the required Gallons Per Minute (GPM). A small apartment might only need 3-4 GPM, while a large family home with multiple bathrooms will require 8 GPM or more. Also, consider your climate. In colder regions, the incoming water is colder, meaning the heater has to work harder. This “temperature rise” will affect the unit’s effective GPM. Always check the manufacturer’s GPM chart for your groundwater temperature.
Budget - Setting realistic price expectations ($X-$Y ranges)
Propane tankless water heaters range in price from around $200 for small, point-of-use models to over $1,500 for high-capacity, whole-home condensing units. A realistic budget for a quality heater for a mid-sized home is typically between $400 and $900. Remember to factor in the cost of professional installation, which can add several hundred dollars to the total price. While a higher upfront cost for a more efficient condensing model might seem steep, it can lead to significant energy savings over the unit’s lifespan, paying for itself in the long run.
Key Features - Most important technical specifications
Beyond GPM and BTU (British Thermal Units, a measure of heating power), look for other key features. Condensing vs. Non-condensing: Condensing units have a second heat exchanger to capture extra heat from the exhaust gas, making them over 90% efficient, but they cost more. Non-condensing units are typically around 80-85% efficient. Also, look for features like precise temperature control, anti-freeze protection (crucial for outdoor or unheated space installations), and low-flow activation for better performance with modern, water-saving fixtures.
Quality & Durability - What to look for in construction
The heart of a tankless water heater is its heat exchanger. Look for models with heat exchangers made of copper or stainless steel, as these materials offer excellent heat transfer and corrosion resistance. A stainless steel casing also adds to the unit’s longevity. Check the warranty details. A long warranty, especially on the heat exchanger (often 10-15 years), is a strong indicator of the manufacturer’s confidence in their product’s durability.
Brand Reputation - Importance of established manufacturers
While newer brands can offer great value, established manufacturers like Rheem, Rinnai, and others have a long track record of reliability, performance, and customer support. They often have more extensive service networks and readily available parts. Reading customer reviews and professional plumber recommendations can provide valuable insight into a brand’s real-world performance and service quality.
Portability/Size - Considerations for space and storage
One of the primary benefits of a tankless water heater is its compact size. Measure the space where you plan to install the unit to ensure a proper fit, leaving adequate clearance for venting and servicing as specified by the manufacturer. If you need a heater for an RV, a job site, or a camping trip, there are specific portable models designed for this purpose that are lightweight and easy to connect to a standard propane tank.
Is it A Wise Decision to Buy propane tankless water heaters?
Investing in a propane tankless water heater is a very wise decision for most homeowners, offering a compelling blend of long-term value, convenience, and efficiency. The most significant advantage is the endless supply of hot water. Unlike a traditional tank heater that can run out, a tankless unit heats water on demand, meaning you’ll never have to cut a shower short again. This on-demand heating process is also far more energy-efficient. Traditional tanks constantly burn fuel to keep a large volume of water hot, leading to standby heat loss. A tankless system only consumes energy when a hot water tap is opened, which can reduce your water heating costs by up to 30-40%.
While the initial purchase price is higher than that of a conventional tank heater, the long-term savings on utility bills often recoup the difference over the unit’s lifespan. Furthermore, tankless water heaters are significantly more durable, typically lasting 20 years or more—double the lifespan of an average tank heater. They also have a much smaller physical footprint, freeing up valuable storage space in your utility closet, basement, or garage. For homes not connected to a natural gas line, propane offers a clean and efficient fuel source. Ultimately, a propane tankless water heater is an upgrade to your home’s infrastructure that enhances comfort, saves money, and provides lasting value.
What Is the Best Way to Choose propane tankless water heaters?
Choosing the best propane tankless water heater is a systematic process. Following these steps will help you find the perfect model for your home and avoid common pitfalls.
Step 1: Calculate Your Peak Hot Water Demand Start by listing all the hot water fixtures you might use simultaneously. A typical shower uses 2.5 GPM, a faucet 1.5 GPM, and a dishwasher 1.5 GPM. If you might run two showers at once, your peak demand is 5.0 GPM. This is the most critical number you need.
Step 2: Determine Your Required Temperature Rise Find the average groundwater temperature in your region (you can find maps online). If your groundwater is 50°F and you want your shower at 105°F, you need a temperature rise of 55°F.
Step 3: Match GPM and Temperature Rise on Spec Sheets Look at the specification charts for the heaters you are considering. They will show the GPM the unit can produce at different temperature rises. Ensure the model you choose can meet your peak GPM demand at your required temperature rise. It’s a common mistake to only look at the maximum GPM rating, which is usually calculated at a very low temperature rise.
Step 4: Consider Efficiency and Venting Decide between a non-condensing (around 82% efficiency) and a condensing model (95%+ efficiency). Condensing units cost more upfront but save more money over time. Also, determine your installation location. Indoor units require specific, and often expensive, venting systems (usually stainless steel). Outdoor units require no venting, saving on installation costs, but must be equipped with adequate freeze protection.
Step 5: Don’t Skimp on Installation A common mistake is attempting a DIY installation or hiring an unqualified handyman. Improper installation can void your warranty, create a safety hazard, and lead to poor performance. Always hire a licensed and insured plumber who has experience with tankless water heaters. It’s a worthwhile investment to ensure your unit runs safely and efficiently for years to come.
FAQ
What is the best propane tankless water heaters for beginners?
For a beginner, the best option is a model that balances performance with simplicity and value, like the APUS 4.42 GPM Indoor Heater. It’s powerful enough for a small-to-medium home, offers user-friendly features like precise temperature control, and comes at an accessible price point. Its multiple safety protections and quiet operation provide peace of mind, making it a great first step into the world of tankless hot water.
How much should I spend on propane tankless water heaters?
For a reliable whole-home unit, expect to spend between $400 and $900. Budget-friendly models for smaller homes or cabins can be found for under $300. High-end, high-capacity condensing models from premium brands like Rinnai or Rheem can cost upwards of $1,200. Remember to budget an additional $500-$1,500 for professional installation, depending on the complexity of the job.
What features are most important in propane tankless water heaters?
The three most important features are the GPM flow rate, the BTU heating power, and the type of heat exchanger. The GPM must match your household’s peak demand. The BTUs determine how quickly it can heat water. A copper or stainless steel heat exchanger is crucial for durability and efficiency. After that, look for safety features like anti-freeze protection and precise temperature controls.
How do I maintain my propane tankless water heaters?
The most important maintenance task is to descale the unit annually, especially if you have hard water. This involves flushing the system with a vinegar solution to remove mineral buildup from the heat exchanger. You should also regularly inspect the air intake and exhaust vents for any blockages. Following the manufacturer’s maintenance schedule will ensure longevity and optimal performance.
Are expensive propane tankless water heaters worth it?
Yes, in many cases, they are. More expensive models are typically condensing units with over 95% energy efficiency, which can lead to significant long-term savings on your propane bills. They also tend to have higher GPM flow rates, more advanced features like smart controls, and are built with more robust materials, often backed by longer warranties. They are an investment in performance, efficiency, and durability.
What brands make the best propane tankless water heaters?
Established brands like Rheem and Rinnai are widely considered industry leaders known for their quality, reliability, and extensive service networks. However, brands like APUS, Ranein, and FOGATTI are offering excellent value and innovative features, making them strong contenders, especially for those looking for smart technology or budget-friendly options. The best brand often depends on your specific needs and budget.
How long do propane tankless water heaters typically last?
A well-maintained propane tankless water heater can last 20 years or more. This is roughly double the average lifespan of a traditional tank-style water heater, which typically needs replacement every 8 to 12 years. The longevity of tankless units is a major factor in their overall value proposition, helping to offset the higher initial purchase price.
Can I find good propane tankless water heaters on a budget?
Absolutely. Brands like forimo and VELPAX offer excellent budget-friendly models that provide the core benefits of endless hot water and energy savings. While they may not have the high flow rates or advanced features of premium units, they are more than capable of servicing apartments, small homes, or cabins effectively, making them a fantastic value for under $300.
Do I need a professional to install my tankless water heater?
Yes, it is highly recommended. Propane tankless water heaters involve gas lines, water connections, and complex venting systems. Improper installation can be a serious safety hazard, leading to gas leaks or carbon monoxide issues. Furthermore, most manufacturers require professional installation to keep the warranty valid. It’s a crucial step to ensure safety, performance, and warranty coverage.
What is the difference between a condensing and a non-condensing unit?
A non-condensing unit has one heat exchanger and vents hot exhaust gases, achieving about 80-85% efficiency. A condensing unit has a second heat exchanger that captures additional heat from those exhaust gases before they are vented. This makes them much more efficient (95%+) but they are more expensive and require a drain for the condensate. Condensing units offer better long-term energy savings.
Final Verdict
After extensive testing and comparison, we’ve determined the best propane tankless water heaters for every need, but a few models truly rise above the rest.
For the ultimate combination of power, reliability, and whole-home capacity, our top recommendation is the Rheem RTGH Series 9.5 GPM Heater. Its massive flow rate and robust build quality make it the perfect solution for large families who refuse to compromise on hot water availability.
For those seeking a premium, future-proof investment, the Rinnai RX199iN Condensing Smart Heater is unmatched. Its incredible efficiency, high GPM, and versatile dual-fuel design place it in a class of its own.
If you’re on a tighter budget but still want reliable performance, the APUS 4.42 GPM Indoor Heater offers outstanding value with features like precise temperature control and quiet operation.
Your next step is to assess your home’s specific GPM needs and installation requirements. By choosing one of our top-rated models, you can be confident you’re investing in years of endless, efficient, and comfortable hot water.
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