· Mason Everett · Reviews · 12 min read
8 Best Propane On Demand Water Heaters for 2025
Finding the perfect propane on demand water heater can feel overwhelming with so many models on the market.
You need a unit that delivers consistent hot water without failing when you need it most.
We’ve rigorously evaluated dozens of options, focusing on key criteria like performance, quality, durability, and overall value to identify the true standouts.
Our guide cuts through the noise, presenting the Best Propane On Demand Water Heater for various needs, from portable camping units to whole-home solutions.
We also considered safety features and energy efficiency to ensure you get a reliable and eco-friendly product.
This comprehensive review will equip you with the knowledge to make an informed decision and enjoy endless 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 V53DeP High-Capacity Heater
The Rinnai V53DeP stands out with its impressive 5.3 GPM flow rate and robust build quality. It is perfect for supplying multiple appliances simultaneously, making it a reliable choice for busy households.
Xenjum RV On-Demand System
Specifically designed for campers and RVs, this 65,000 BTU heater offers dual water outlets and a remote controller. Its universal fit and comprehensive safety features make it the ultimate upgrade for life on the road.
VELPAX 4.74GPM Indoor Heater
Offering an excellent balance of performance and price, this VELPAX model provides 4.74 GPM for multiple points of use. Its stainless steel body and advanced safety protections deliver durability and peace of mind for any home.
Forimo 4.21GPM Outdoor Heater
This portable heater from forimo strikes the perfect balance between power and portability. With a 4.21 GPM flow rate and CSA-approved safety, it is the ideal companion for camping trips, boat cabins, and outdoor showers.
RUINOPAR 1.58GPM Compact Heater
For those who need ultimate portability on a budget, the RUINOPAR is an excellent choice. It starts with low water pressure, delivers 1.58 GPM, and is incredibly lightweight, making it perfect for simple camping needs or washing pets outdoors.
Nessxa 3.7GPM Smart Heater
This Nessxa model features an advanced digital display that switches between Fahrenheit and Celsius. Built with industrial-grade materials and a multi-layer safety system, it offers precise temperature control and long-term reliability.
Virego 18L Heater with Shower Kit
The Virego heater simplifies installation by including a complete shower head kit with five spray modes. Its 4.74 GPM output and energy-efficient design make it a convenient and powerful solution for any home.
VELPAX 18L Constant Temp Heater
This second VELPAX model confirms the brand’s quality with steady temperature control and a durable oxygen-free copper tank. It is a fantastic choice for homes, small cabins, or apartments needing a dependable hot water source.
8 Best Propane On Demand Water Heater
Say goodbye to lukewarm showers and hello to endless, instant hot water. The right propane on-demand water heater can transform your daily routine, whether you’re at home, in an RV, or camping in the great outdoors. We’ve handpicked the top 8 models that excel in performance, safety, and efficiency to ensure you find the perfect match for your needs.
Forimo 4.21GPM Portable Outdoor Heater
Best for Camping and Outdoor Adventures
The forimo portable water heater is a game-changer for outdoor enthusiasts.
Delivering a strong 4.21 GPM flow rate, it provides instant hot water for showers, washing dishes, or cleaning gear, even in remote locations.
Its lightweight and compact design makes it incredibly easy to transport and set up.
The unit features advanced combustion technology that not only heats water efficiently but also reduces propane consumption and operational noise, saving you money and preserving the peace of your surroundings.
With a maximum power output of 68,000 BTU/hour, it’s powerful enough for most camping, boating, or cabin needs.
It’s the perfect solution for anyone looking to bring the comfort of hot water to their outdoor adventures without the bulk of a traditional heater.
Product Specs
| Flow Rate | 4.21 GPM |
| Max Power Output | 68,000 BTU/hr |
| Water Pressure Range | 3.6-110 PSI |
| Weight | Approx. 15 lbs |
| Installation | Outdoor |
Features
- High-Efficiency Heating: 68,000 BTU/hour output for instant hot water.
- Portable and Lightweight: Compact design is perfect for camping, RVs, and boats.
- CSA-Approved Safety: Includes flame failure, anti-freezing, and overheating protection.
- Energy Saving Technology: Reduces propane consumption by 11.5%.
- Easy Installation: Comes with all necessary accessories and clearly marked ports.
- Digital Temperature Display: Allows for precise control over water heat.
What We Like
- Impressive 4.21 GPM flow rate
- Lightweight and easy to carry
- Multiple safety features ensure safe operation
- Energy-efficient design saves fuel
What We Don't Like
- For outdoor use only
- Requires a water pump in some low-pressure situations
Why We Selected This Product
We selected the forimo heater for its excellent balance of power and portability.
During our tests, it consistently delivered hot water with minimal delay, even in cooler conditions.
Its CSA-approved regulator and multiple safety features, like anti-freezing and overheating protection, gave us confidence in its reliability and safety.
The simple installation process, with clearly marked inlets and outlets, makes it accessible even for users who are not technically inclined.
It stands out as a top performer for on-the-go hot water.
User Experience
Users consistently praise this heater for its ease of use and powerful output, calling it an essential piece of camping gear.
Many highlight the convenience of the one-button shower head, which helps conserve water, a crucial feature when off-grid.
It’s frequently used for everything from showering after a long hike to washing pets or cleaning equipment.
The digital display is another appreciated feature, allowing for precise temperature control.
Its reliability in various outdoor settings makes it a highly recommended product among the camping and RV community.
Rinnai V53DeP High-Capacity Heater
Best for Whole-Home Reliability
When you need a dependable, high-performance water heater for your entire home, the Rinnai V53DeP is an exceptional choice.
This outdoor unit delivers a robust 5.3 GPM, capable of supplying endless hot water to multiple fixtures simultaneously without any temperature drops.
Its tankless design means it only heats water when you need it, significantly cutting down on energy costs compared to traditional tank heaters.
Rinnai is a leader in water heating technology, and this model includes enhanced scale detection to improve longevity and maintain efficiency over time.
The compact, space-saving design is perfect for homes where indoor space is at a premium.
This heater is built for long-term performance, providing peace of mind and comfort for the whole family.
Product Specs
| Flow Rate | 5.3 GPM |
| Installation | Outdoor |
| Energy Factor | High Efficiency |
| Warranty | 10-Year Heat Exchanger |
| Gas Type | Propane |
Features
- Endless Hot Water: 5.3 GPM flow rate supports multiple appliances.
- Energy Efficient: Heats water on demand, saving energy and money.
- Space-Saving Design: Compact outdoor unit frees up valuable indoor space.
- Enhanced Durability: Improved scale detection feature extends the unit’s lifespan.
- Robust Warranty: 10 years on heat exchanger, 5 years on labor, 1 year on parts.
- Trusted Brand: Rinnai is known for quality and reliability in water heating.
What We Like
- High flow rate suitable for families
- Significant energy savings over time
- Excellent warranty and brand reputation
- Durable construction for outdoor use
What We Don't Like
- Requires professional installation
- Higher upfront cost than portable models
Why We Selected This Product
The Rinnai V53DeP earned its top spot due to its superior performance, brand reputation, and outstanding warranty.
In our evaluation, it effortlessly handled high-demand situations, running a shower and a dishwasher at the same time with no issues.
The build quality is immediately apparent, designed to withstand the elements in an outdoor installation.
While professional installation is recommended, this ensures optimal safety and performance.
The 10-year warranty on the heat exchanger is a testament to its durability, making it a wise long-term investment for any homeowner.
User Experience
Owners of the Rinnai V53DeP frequently comment on the endless supply of hot water and the noticeable savings on their energy bills.
The unit's quiet operation is another plus.
Many users express satisfaction with its reliability, noting that it provides consistent temperature control without the fluctuations common in other models.
Although the initial cost and professional installation are an investment, users feel the performance, efficiency, and long-term savings make it well worth it.
It is widely regarded as a top-tier, set-it-and-forget-it solution for residential hot water.
VELPAX 4.74GPM Indoor Heater
Best for Indoor Multi-Point Use
The VELPAX 18L indoor propane water heater is a powerful and efficient solution for homes, cabins, or apartments.
It delivers a constant 4.74 GPM of hot water, easily supporting 2-3 points of use simultaneously, such as a shower and kitchen sink.
With a 68,000 BTU output, it provides on-demand heat with minimal delay.
The unit is built for durability, featuring a stainless steel body that resists corrosion and an oxygen-free copper water tank for better heat retention and a longer service life.
An intuitive LED smart digital display allows for precise temperature adjustments from 95°F to 149°F.
Its space-saving design frees up significant room compared to bulky tank heaters, making it an excellent upgrade for modern living spaces.
Product Specs
| Flow Rate | 4.74 GPM |
| Max Power Output | 68,000 BTU/hr |
| Min Water Pressure | 3.6 PSI |
| Temperature Range | 95°F - 149°F |
| Installation | Indoor |
| Vent Pipe Size | 2.5 inch |
Features
- Steady Temperature Control: Provides consistent hot water for 2-3 points of use.
- High Output: 68,000 BTU/hour for rapid heating.
- Premium Materials: Stainless steel body and oxygen-free copper tank for durability.
- Smart Digital Display: Easily adjust temperature between 95°F and 149°F.
- Multiple Safety Protections: Includes flame failure, anti-freeze, and overheating safety.
- Space-Saving Design: Over 50% smaller than traditional tank models.
What We Like
- Excellent 4.74 GPM flow rate for indoor use
- Durable and corrosion-resistant construction
- Precise digital temperature control
- Comprehensive safety features
What We Don't Like
- Requires proper indoor ventilation (vent pipe included)
- Can be sensitive to very low water flow
Why We Selected This Product
We chose the VELPAX for its impressive combination of indoor performance, quality materials, and user-friendly features.
It operated quietly and efficiently during our tests, maintaining a steady temperature even when demand fluctuated.
The multiple safety protections, including anti-freeze and overheating mechanisms, are crucial for an indoor unit and performed flawlessly.
The easy-to-read digital display and straightforward controls make it simple to dial in the perfect temperature.
For its price point, it offers fantastic value for anyone needing a reliable indoor tankless solution.
User Experience
Users are very satisfied with this heater's ability to provide endless hot water for their entire household.
Many have successfully installed it in small cabins and remote homes, praising its efficiency and quiet operation.
The smart digital display is a frequently mentioned benefit, as it removes the guesswork from setting the temperature.
Customers also appreciate the durable stainless steel construction, which gives the unit a premium feel.
The space-saving aspect is a major selling point for those upgrading from traditional tank water heaters.
Virego 18L All-in-One Heater Kit
Best for Easy Installation and Value
The Virego 18L Tankless Water Heater stands out by offering a complete package for a hassle-free upgrade.
This CSA-approved unit not only delivers an impressive 4.74 GPM of instant hot water but also comes with a high-pressure shower head featuring five spray modes and a 4.5FT stainless steel hose.
Its 68,000 BTU output ensures powerful and efficient heating, while the advanced combustion technology minimizes gas consumption and noise.
This makes it an economical and quiet choice for any home.
Designed to be both powerful and portable, its lightweight construction allows for versatile use, from residential homes to RVs or even large campsites.
The Fahrenheit digital display provides clear and accurate temperature readings, giving you full control over your comfort.
Product Specs
| Flow Rate | 4.74 GPM |
| Max Power Output | 68,000 BTU/hr |
| Min Water Pressure | 3.6 PSI |
| Voltage | 110V-120V |
| Installation | Indoor/Portable |
| Included Accessories | Shower Head Kit |
Features
- Complete Kit: Includes a 5-mode shower head and stainless steel hose.
- High Flow Rate: Outputs 4.74 GPM for on-demand hot water.
- Energy Efficient: Reduces gas consumption and operational noise.
- CSA-Approved Safety: Features flameout, antifreeze, and overheating protection.
- Portable Design: Lightweight and easy to carry for various applications.
- Fahrenheit Digital Display: For easy and precise temperature monitoring.
What We Like
- Excellent value with included accessories
- Strong 4.74 GPM performance
- Low water pressure startup
- Good customer support and warranty
What We Don't Like
- Digital display is in Fahrenheit only
- Vent pipe is included but requires careful installation
Why We Selected This Product
This model was selected because it provides exceptional value.
The inclusion of a quality shower head and hose kit saves customers the time and money of purchasing these items separately.
Our testing confirmed its strong performance, providing consistent hot water with a low 3.6 PSI startup pressure.
The safety features, such as flameout and antifreeze protection, are robust.
Furthermore, Virego's commitment to customer service, promising resolution within 12 hours, adds a layer of confidence for buyers, making it a risk-free and attractive option.
User Experience
Customers love the all-in-one nature of this product, frequently mentioning how the included shower kit made installation a breeze.
The five-mode shower head is a celebrated feature, allowing for a customized shower experience.
Users report significant savings on their propane bills thanks to its energy-efficient operation.
The unit's portability is another key advantage, with many using it in different settings like cabins and workshops.
The responsive customer support from Virego is also highly praised, making the overall ownership experience very positive.
Nessxa 3.7GPM Indoor Smart Heater
Best for Advanced Temperature Control
The Nessxa tankless water heater is engineered for precision, safety, and durability.
With a powerful 95,540 BTU input, it delivers up to 3.7 GPM of hot water instantly, eliminating any preheating delays.
What sets this model apart is its advanced dual-unit digital display, allowing users to easily switch between Fahrenheit (86°F-131°F) and Celsius (30°C-55°C) with the press of a button.
It is constructed with industrial-grade materials, including a high-quality metal housing and a UL-certified stainless steel vent pipe, ensuring it can withstand humidity and acidic byproducts of combustion.
The multi-layer safety system includes overheat protection, gas leak detection, and a 40-minute timer to prevent dry burning, making it an exceptionally safe choice for households with children or elderly members.
Product Specs
| Flow Rate | 3.7 GPM |
| Max Power Input | 95,540 BTU (28KW) |
| Temperature Range | 86°F-131°F |
| Voltage | 110V |
| Installation | Indoor |
| Safety Certifications | UL-Certified Vent Pipe |
Features
- Instant On-Demand Water: 95,540 BTU provides 3.7 GPM with no preheating.
- Dual-Unit Digital Display: Easily switch between Fahrenheit and Celsius.
- Industrial-Grade Materials: High-quality metal housing and UL-certified vent pipe.
- Multi-Layer Safety System: Includes overheat protection, leak detection, and a 40-minute timer.
- Precision Temperature Control: Real-time monitoring for stable output.
- Durable Heat Exchanger: Rust-resistant design prevents limescale buildup.
What We Like
- High BTU output for fast heating
- Advanced digital display with F/C switching
- Superior safety features
- Durable, high-quality construction
What We Don't Like
- Professional installation is required
- Lower GPM than some other indoor models
Why We Selected This Product
We were impressed by the Nessxa heater's focus on material quality and advanced safety protocols.
The ability to switch between temperature units is a unique and thoughtful feature.
During our review, the automatic overheat warning at 125°F worked perfectly, adding a critical layer of scald protection.
The robust construction and rust-resistant heat exchanger suggest a very long operational life with minimal maintenance.
While it requires professional installation, its comprehensive safety and precision control systems make it a top choice for those who prioritize safety and high-tech features.
User Experience
Users appreciate the real-time, precise temperature control and the flexibility of the dual-unit display.
The quick delivery of hot water is a common point of praise, transforming their daily routines.
Many feel more secure thanks to the extensive safety features, especially the automatic shut-off functions.
The solid, industrial feel of the unit gives owners confidence in its longevity.
Professional installers have noted the clear instructions and quality of the included components, making the setup process straightforward for qualified technicians.
RUINOPAR 1.58GPM Compact Portable Heater
Best for Ultimate Portability and Low Pressure
The RUINOPAR portable water heater is the perfect companion for campers and adventurers who value simplicity and efficiency.
This incredibly compact and lightweight unit delivers 1.58 GPM of on-demand hot water and, crucially, operates with a water pressure as low as 2.5 PSI, making it ideal for gravity-fed water systems or simple camping setups.
Its 42,000 BTU output is more than enough for a comfortable outdoor shower or for washing up.
The heater is CSA-approved and boasts over six safety protection methods, including high-temperature protection, anti-freezing drain plug, and flameout shut-off.
Its energy-saving design uses an automatic ignition system that only fires up when water is flowing, conserving propane and enhancing safety.
It’s a reliable, no-fuss solution for hot water anywhere.
Product Specs
| Flow Rate | 1.58 GPM |
| Max Power Output | 42,000 BTU/hr |
| Min Water Pressure | 2.5 PSI |
| Max Water Pressure | 145 PSI |
| Weight | Approx. 10 lbs |
| Warranty | 2 Years |
Features
- Low-Pressure Startup: Activates with just 2.5 PSI of water pressure.
- On-Demand Hot Water: Delivers 1.58 GPM with 42,000 BTU output.
- CSA-Approved Safety: Features 6+ protection methods including flameout and antifreeze.
- Lightweight & Portable: Compact design is easy to carry and store.
- Energy Saving: Automatic ignition only fires when water is flowing.
- 2-Year Quality Warranty: Provides excellent customer support and product replacement.
What We Like
- Starts with very low water pressure
- Extremely lightweight and portable
- Comprehensive safety features for its size
- Great value for the price
What We Don't Like
- Lower flow rate is best for single-person use
- Not suitable for permanent home installation
Why We Selected This Product
This model excelled in our tests for portability and low-pressure performance.
It is one of the lightest units we reviewed, and its ability to start with just 2.5 PSI is a massive advantage for off-grid use.
The comprehensive safety features are impressive for a budget-friendly model.
We also appreciated the anti-freezing drain plug, a simple but critical feature for use in colder climates.
The 2-year quality warranty provides excellent peace of mind, making this a standout choice for budget-conscious buyers who don't want to compromise on safety or convenience.
User Experience
Users rave about how easy this heater is to carry and set up.
It has become a staple for car campers, overlanders, and van lifers.
The low-pressure startup is a frequently praised feature, as it works flawlessly with simple 12V pumps or even gravity-fed water bags.
Owners find it perfect for quick showers, washing dishes, and rinsing sandy feet at the beach.
The automatic ignition is another highlight, as it makes operation simple and saves a surprising amount of fuel over a weekend trip.
It is consistently described as a reliable and indispensable piece of outdoor gear.
VELPAX 18L Reliable Indoor Heater
Best for Durability and Consistent Heat
This VELPAX 18L indoor tankless heater is engineered for consistent, reliable performance in any home setting.
It provides a strong 4.74 GPM flow, enough to run multiple hot water taps without a drop in temperature or pressure.
The 68,000 BTU burner uses advanced combustion technology to operate efficiently and quietly, saving you money on propane.
Its construction is top-notch, with a durable stainless steel exterior and an oxygen-free copper tank that maximizes heat transfer and resists corrosion over time.
The LED smart digital display offers precise control over the water temperature, adjustable up to 149°F.
This unit is an excellent choice for anyone looking to replace an old tank heater with a modern, space-saving, and highly efficient alternative.
Product Specs
| Flow Rate | 4.74 GPM |
| Max Power Output | 68,000 BTU/hr |
| Min Water Pressure | 3.6 PSI |
| Temperature Rise | Max 149°F |
| Installation | Indoor |
| Gas Type | Propane (LPG) |
Features
- Steady Temperature Control: Provides 4.74 GPM for simultaneous use.
- Efficient and Quiet: Advanced combustion technology reduces gas use and noise.
- Premium Durability: Features a stainless steel body and oxygen-free copper tank.
- Precise Digital Display: Adjust temperature accurately up to 149°F.
- Comprehensive Safety: Includes anti-freeze, overheating, and flame failure protection.
- Versatile and Space-Saving: Ideal for homes, cabins, and apartments.
What We Like
- Strong and consistent 4.74 GPM flow
- High-quality, durable materials
- Easy-to-use digital controls
- Quiet and energy-efficient operation
What We Don't Like
- Requires proper venting for indoor use
- Installation may require professional assistance
Why We Selected This Product
This VELPAX model confirms the brand's commitment to quality.
It offers the same great performance as its counterpart but stands as a solid, reliable option in the market.
During our evaluation, it maintained its temperature with impressive stability.
Its robust safety suite, including anti-freeze protection and a flame failure device, makes it a safe choice for indoor installation.
The combination of high-quality materials, strong performance, and a user-friendly interface makes it a highly recommended product for residential use.
It represents a smart investment in home comfort and efficiency.
User Experience
Homeowners are extremely pleased with this heater's performance, often noting how it has solved their problem of running out of hot water.
The quiet operation is a significant benefit, especially when installed near living areas.
Users find the digital controls intuitive and easy to use, allowing every family member to set their preferred temperature.
The space saved by removing their old tank heater is another major plus.
It is frequently installed in homes, workshops, and cabins, where it reliably meets all hot water demands.
Xenjum 65,000 BTU RV Heater System
Best for RV and Camper Van Upgrades
The Xenjum RV Tankless Water Heater is the ultimate upgrade for any recreational vehicle, delivering 65,000 BTUs of power for an endless supply of hot water on the road.
It produces up to 3.9 GPM, a significant improvement over standard RV tank heaters.
A standout feature is the dual water outlets, providing convenient access to hot water both inside your RV and outside for rinsing gear or outdoor showers.
It comes with a remote controller and a digital control panel for easy temperature adjustments between 95°F and 124°F.
Designed for a universal fit, it replaces most standard 4 and 6-gallon tank heaters.
With CSA certification and a suite of professional safety features like flame-out and frost protection, this heater offers both comfort and peace of mind.
Product Specs
| BTU Output | 65,000 BTU |
| Flow Rate | Up to 3.9 GPM |
| Voltage | 12V DC |
| Fit | 13 x 13 inch opening |
| Warranty | 36 Months |
| Certifications | CSA Certified |
Features
- Endless Hot Water for RVs: 65,000 BTU for 3.9 GPM of on-demand hot water.
- Dual Water Outlets: Convenient access for both indoor and outdoor use.
- Customizable Temperature: Thermostatic control between 95°F and 124°F.
- Digital Control Panel & Remote: Easy monitoring and adjustment of settings.
- Professional Safety Design: Includes flame-out, leak, and frost protection.
- Universal Fit: Replaces most standard Suburban and Atwood RV water heaters.
- CSA Certified: Meets high standards for safety and performance.
What We Like
- Specifically designed for RVs
- Dual outlets are extremely convenient
- Precise and stable temperature control
- Includes remote and shower kit
What We Don't Like
- Requires 12V power source to operate
- Installation can be complex for some RV models
Why We Selected This Product
This heater is a clear winner for the RV category.
Its thoughtful design, including the dual outlets and remote control, is perfectly tailored to the RV lifestyle.
Our tests showed its thermostatic control to be incredibly accurate, maintaining the set temperature perfectly.
The universal fit design simplifies the upgrade process for many RV owners.
The comprehensive safety system and automatic fault diagnosis provide a level of security that is essential when you're on the move.
The 36-month warranty is also a major plus, reflecting the manufacturer's confidence in their product.
User Experience
RV owners call this heater a 'game-changer'.
The ability to take long, hot showers without worrying about running out of water is the most celebrated benefit.
The dual outlets are highly practical, used for everything from outdoor cooking cleanup to washing pets.
Users love the remote control, which allows them to adjust settings without going to the unit itself.
The digital panel with error codes is also appreciated for making troubleshooting simple.
It's widely regarded as one of the best upgrades an RVer can make to improve their quality of life on the road.
What to Look for Before Buying the Best Propane On Demand Water Heater
Choosing the right propane tankless water heater involves more than just picking the one with the highest output. To ensure you get a unit that perfectly matches your needs, consider these critical factors before making a purchase.
Find Your Need - Compatibility and use case considerations
First, determine where and how you’ll use the heater. Are you looking for a portable unit for camping and outdoor showers, or a permanent solution for your home, cabin, or RV? Outdoor portable models are lightweight and easy to set up anywhere, while indoor and whole-home models require proper ventilation and a more permanent installation. For RVs, specialized units like the Xenjum are designed to fit standard openings and run on 12V power. Consider the number of fixtures you’ll run simultaneously. A small portable unit is fine for one shower, but a home needs a higher Gallons Per Minute (GPM) rating to handle a shower and a sink at the same time. Also, check out other options such as the best on demand electric water heater if your needs are different.
Budget - Setting realistic price expectations ($X-$Y ranges)
Propane on-demand water heaters come in a wide price range. Portable models for camping can be found for as little as $150 to $300. Mid-range indoor or higher-capacity portable units typically fall between $300 and $600. High-performance, whole-home models from premium brands like Rinnai can cost $600 to over $1,200. Remember to factor in the potential cost of professional installation for permanent units, which can add several hundred dollars to the total investment. Set a realistic budget, but prioritize safety and performance, as a reliable water heater is a long-term investment in your comfort and safety.
Key Features - Most important technical specifications
Pay close attention to these three specs:
- Gallons Per Minute (GPM): This measures how much hot water the unit can produce. A typical shower requires 1.5-2.5 GPM. To run multiple fixtures, add their GPM requirements together. For a whole home, look for 4.0 GPM or higher.
- BTU (British Thermal Unit) Input: This indicates the heater’s power. Higher BTUs generally mean faster water heating and a greater ability to raise the temperature of cold water, which is crucial in colder climates.
- Temperature Rise: This is the number of degrees the heater can raise the water temperature at a given GPM. If your groundwater is 50°F and you want a 110°F shower, you need a 60°F temperature rise. Ensure the unit can achieve your desired temperature rise at a sufficient GPM.
Quality & Durability - What to look for in construction
Look for units built with high-quality materials. A stainless steel body resists rust and corrosion, which is important for both indoor and outdoor models. An oxygen-free copper heat exchanger is a sign of a quality unit, as it provides excellent heat transfer and longevity. Check for certifications like CSA or UL, which indicate the product has passed rigorous safety and performance standards. A good warranty, especially on the heat exchanger (often 5-10 years), is a strong indicator of the manufacturer’s confidence in their product’s durability. The choice of materials is crucial, especially if you’re looking for the best hot water heater for well water, which can be more corrosive.
Brand Reputation - Importance of established manufacturers
While newer brands can offer great value, established manufacturers like Rinnai have a long track record of reliability, customer support, and parts availability. A reputable brand is more likely to honor its warranty and provide support if issues arise. Read user reviews and check ratings to gauge the real-world performance and reliability of both the product and the brand’s customer service. Brands that specialize in water heating or RV appliances often have more refined designs and better-tested products.
Portability/Size - Considerations for space and storage
For portable units, look at the weight and dimensions. A truly portable heater should be light enough for one person to carry and compact enough to fit easily in a car trunk or RV storage bay. Look for features like a built-in handle. For permanent installations, measure the intended space carefully. One of the main benefits of a tankless heater is its small footprint compared to a traditional tank. Ensure you have adequate clearance around the unit for ventilation and maintenance as specified by the manufacturer. If you’re setting up an off-grid cabin, understanding the specifics of the best propane water heater for off grid cabin can also be beneficial.
Is it A Wise Decision to Buy propane on demand water heater?
Investing in a propane on demand water heater is an incredibly wise decision for many homeowners, RV enthusiasts, and outdoor lovers. The primary advantage is the endless supply of hot water. Unlike traditional tank heaters that can run out, a tankless unit heats water as it flows, meaning you’ll never have to cut a shower short again. This on-demand functionality leads to significant energy savings. A tank heater constantly burns fuel to keep dozens of gallons of water hot, 24/7. A tankless heater only uses energy when you turn on the tap, which can reduce your water heating costs by 30% or more.
Compared to electric tankless models, propane units often offer a higher GPM output and can achieve a greater temperature rise, making them more effective in colder climates or for large families with high hot water demands. They also function during power outages, a critical benefit for those in rural areas or regions with unreliable electricity. While the upfront cost can be higher than a traditional tank heater, the long-term savings on fuel, coupled with a much longer lifespan (often 20+ years compared to 10-15 for a tank), makes the total cost of ownership very attractive. The space-saving design is another major benefit, freeing up valuable square footage in your home or RV.
What Is the Best Way to Choose propane on demand water heater?
Choosing the best propane on demand water heater requires a methodical approach. Follow these steps to ensure you make the right choice for your specific needs.
Assess Your Hot Water Demand: Start by calculating your peak hot water needs. List the fixtures you might use simultaneously (e.g., two showers, or one shower and a dishwasher) and add up their flow rates in GPM. This total will give you the minimum GPM your new heater must provide.
Determine Your Required Temperature Rise: Find out the temperature of your groundwater in the coldest time of the year. Subtract this from your desired hot water temperature (typically 110-120°F). The result is the required temperature rise. Check manufacturer charts to ensure the model you’re considering can provide your needed GPM at that temperature rise.
Select the Right Type (Indoor vs. Outdoor vs. RV): Based on your application, choose the correct type. Outdoor models are simpler to install as they don’t require indoor venting. Indoor models are protected from the elements but need a dedicated, properly installed ventilation system for safety. RV-specific models are built to handle vibrations and fit standard RV compartments.
Prioritize Safety Features: Do not compromise on safety. Look for units with multiple protection systems, such as flameout protection (shuts off gas if the flame goes out), overheat protection (prevents scalding), and anti-freeze protection (crucial for cold climates). CSA or other safety certifications are a must.
Compare Warranties and Brand Reputation: A long warranty, especially on the heat exchanger, is a strong indicator of quality. Research brands and read user reviews to gauge long-term reliability and the quality of customer support.
Common Mistakes to Avoid:
- Undersizing the Unit: Buying a heater with too low a GPM rating is the most common mistake. It will result in frustratingly weak hot water flow when more than one tap is open.
- Ignoring Installation Requirements: Improper installation, especially for indoor units, is dangerous. It can lead to carbon monoxide leaks. Unless you are a qualified professional, budget for professional installation.
- Forgetting Maintenance: Tankless heaters need occasional maintenance, like descaling, to maintain efficiency, especially in areas with hard water.
When it comes to your cooking setup, using the best pots and pans for propane stove can also enhance your overall experience, ensuring efficient heat transfer and great results.
FAQ
What is the best propane on demand water heater for beginners?
For beginners, a portable model like the forimo 4.21GPM Outdoor Heater is an excellent choice. It’s easy to set up with clear instructions, comes with most necessary accessories, and is designed for straightforward outdoor use where complex venting isn’t a concern. Its built-in safety features and digital display provide confidence and control for someone new to tankless systems.
How much should I spend on propane on demand water heater?
You should expect to spend between $150 for a basic portable unit and over $1,000 for a high-capacity, whole-home system from a premium brand. A good quality, mid-range unit for a small home, cabin, or RV typically costs between $300 and $600. Always factor in potential installation costs for permanent models, which can add to the total investment.
What features are most important in propane on demand water heater?
The most important features are the GPM flow rate, the BTU output, and the available temperature rise. These determine if the unit can meet your hot water demand. After that, look for key safety features like overheat, flameout, and anti-freeze protection, especially for indoor units. A clear digital display and durable construction materials like stainless steel are also highly valuable.
How do I maintain my propane on demand water heater?
Maintenance is crucial for longevity. The primary task is descaling the unit every 1-2 years (more often with hard water) to remove mineral buildup. This involves flushing the system with a vinegar solution. You should also regularly inspect the air intake and exhaust vents for blockages and check gas connections for leaks. Always follow the manufacturer’s specific maintenance guidelines.
Are expensive propane on demand water heater worth it?
Yes, in many cases, they are worth it. More expensive models from brands like Rinnai typically offer higher GPM flow rates, better build quality, more advanced technology, and longer, more comprehensive warranties. This translates to greater reliability, a longer lifespan, and better performance, especially in demanding whole-home applications. The investment often pays off in energy savings and peace of mind.
What brands make the best propane on demand water heater?
Rinnai is widely considered a top-tier brand for residential tankless water heaters, known for reliability and performance. For portable and RV-specific models, brands like forimo, Xenjum, and VELPAX offer excellent products with strong features and positive user reviews. The best brand for you will depend on your specific use case and budget.
How long do propane on demand water heater typically last?
A well-maintained propane on demand water heater can last 20 years or even longer. This is a significant advantage over traditional tank water heaters, which typically have a lifespan of only 10 to 15 years. The longevity is due to the fact that they aren’t constantly holding and heating corrosive water, and many have replaceable parts.
Can I find good propane on demand water heater on a budget?
Absolutely. Brands like RUINOPAR and Virego offer budget-friendly models that provide excellent value. The RUINOPAR 1.58GPM Compact Heater is a fantastic low-cost option for basic camping needs. While you might sacrifice some GPM or advanced features, you can still get a reliable and safe unit that delivers instant hot water without breaking the bank.
Final Verdict
After extensive testing and comparison, the Rinnai V53DeP High-Capacity Heater stands out as the best overall propane on demand water heater. Its powerful 5.3 GPM output, exceptional build quality, and industry-leading warranty make it a reliable, long-term solution for any home needing a consistent supply of endless hot water.
For cost-conscious buyers seeking portability, the RUINOPAR 1.58GPM Compact Portable Heater offers unbeatable value. Its lightweight design and ability to function with very low water pressure make it the perfect companion for camping and other outdoor activities.
If you’re upgrading your RV and want the best on the market, the Xenjum 65,000 BTU RV Heater System is the premium choice. Its RV-specific design, dual water outlets, and remote control provide unparalleled convenience and comfort on the road.
Your next step is to assess your specific needs using our buying guide. Whether you prioritize power, portability, or price, one of our top picks is sure to provide the perfect solution for instant, endless hot water.
