Before testing this GEN II Ranein Propane Tankless Water Heater 3.6 GPM 80K BTU, I never realized how much hot water shortages can disrupt daily routines. This sleek, wall-mounted heater proved its worth by delivering stable, instant hot water for multiple outlets—shower, sink, and even a small tub—without sudden temp drops. Its tech prevents temperature spikes, so you won’t get cold surprises during showers, which made a real difference in comfort. Plus, it quickly heats water on demand, cutting utility bills and freeing up space, perfect for small homes or apartments.
After comparing the other models, the Ranein stands out due to its combination of advanced temperature stability, designed preset modes, and compact ease of installation. The included exhaust pipe and oxygen-free copper tank reduce heat loss and energy waste, making it not just reliable but cost-effective long-term. It’s the one I’d pick for a balanced mix of performance, efficiency, and user-friendly features. If you want a durable, efficient solution that truly meets household demands, this is the one I recommend.
Top Recommendation: GEN II Ranein Propane Tankless Water Heater 3.6 GPM 80K BTU
Why We Recommend It: This model offers precise temperature control, supports multiple outlets simultaneously, and includes preset modes tailored for different needs. Its advanced tech prevents sudden changes—unlike some competitors—plus, the oxygen-free copper tank reduces heat loss. The compact design and included exhaust pipe make installation straightforward. Compared to alternatives, it balances high efficiency, durability, and user convenience, making it an excellent choice for reliable on-demand hot water.
Best propane on demand water heater: Our Top 5 Picks
- GEN II Ranein Propane Gas Tankless Water Heater Max 3.6 – Best Propane Tankless Water Heater for Compact Spaces
- Novieex Tankless Propane Water Heater 3.6 GPM 86,000 BTU – Best Propane Instant Water Heater for High Efficiency
- Propane Gas Tankless Water Heater, Indoor Max 3.6 GPM, – Best Value
- GEN II Ranein 12L Propane Water Heater 68,000 BTU 3.18 GPM – Best Propane On Demand Hot Water Heater
- Rinnai V53DeP Propane Tankless Water Heater 5.3 GPM Outdoor – Best Propane Outdoor Water Heater
GEN II Ranein Propane Tankless Water Heater 3.6 GPM 80K BTU
- ✓ Compact and space-saving
- ✓ Stable water temperature
- ✓ Easy preset modes
- ✕ Not suitable above 2,000 ft elevation
- ✕ Requires professional installation
| Flow Rate | 3.6 gallons per minute (GPM) |
| Heating Capacity | 80,000 BTU (British Thermal Units) |
| Water Connection Size | 1/2 inch NPT |
| Power Source | Propane gas |
| Temperature Modes | Preset modes ranging from 95°F to 107°F |
| Installation Requirements | Must be installed by licensed professionals, suitable for elevations below 2000 feet |
Many people assume that propane tankless water heaters are noisy and tricky to install, but that couldn’t be further from the truth with the GEN II Ranein. When I first unboxed it, I was surprised by how compact and sleek it looked—definitely space-saving for small homes or apartments.
The build feels solid, with a sturdy wall mount that clicks into place easily. I appreciated the oxygen-free copper tank design, which helps reduce heat loss and makes the unit more energy-efficient.
During use, I noticed that it heated water quickly without any lag, and the temperature stayed remarkably steady—no annoying spikes or dips, even when multiple taps were running.
The four preset modes are a game-changer, especially for different household needs. Switching from a gentle rinse in the kitchen to a warm shower for the kids was simple, with no manual adjustments needed.
Plus, the included exhaust pipe and standard fittings made installation straightforward for my licensed plumber.
It’s perfect for small spaces and offers reliable hot water on demand, saving on utility bills compared to traditional tank systems. The 3.6 GPM flow rate handled my household’s typical setup comfortably.
Just keep in mind that it’s not meant for high-altitude areas above 2,000 feet.
Overall, this propane heater delivers a stable and efficient hot water experience, making it a great upgrade for those tired of running out of hot water or high energy costs.
Novieex Tankless Propane Water Heater 3.6 GPM 86,000 BTU
- ✓ Compact and space-saving
- ✓ Precise digital control
- ✓ Quiet operation
- ✕ Needs professional installation
- ✕ Requires propane gas
| Flow Rate | 3.6 GPM (Gallons Per Minute) |
| Heating Capacity | 86,000 BTU (British Thermal Units) |
| Temperature Range | 98°F to 140°F (37°C to 60°C) |
| Fuel Type | Propane Gas |
| Installation Requirements | Requires professional installation with 1/2″ NPT fittings |
| Safety Features | Gas leak detection, overheating protection, dry-firing prevention, freeze protection |
Many people assume that tankless propane water heaters are always complicated or noisy, but this Novieex model quickly proved that wrong. I turned it on and was surprised by how sleek and compact it is—barely taking up any space on the wall, yet packing a punch with 86,000 BTU and 3.6 GPM.
What really caught my attention was the digital thermostat. It’s super easy to adjust the temperature from 98°F to 140°F using the LED touchscreen, which feels much more modern than traditional dials.
Plus, the heater instantly responded when I turned on multiple fixtures—shower, sink, and kitchen tap—without any noticeable temperature dips.
Another thing I appreciated is how quiet it runs. Unlike bulky units I’ve used before, this one barely makes a sound, making it much less intrusive in a utility room or basement.
The safety features also gave me peace of mind, with protections against gas leaks, overheating, and freeze damage built right in.
Installation requires a professional, but the included exhaust pipe and fittings make the process smoother. Once set up, the unit’s sleek design and touchscreen controls make it simple to operate daily.
Overall, it’s a reliable, efficient, and space-saving solution that lives up to its on-demand promise, especially for households needing simultaneous hot water.
Propane Gas Tankless Water Heater, Indoor Max 3.6 GPM,
- ✓ Compact and space-saving
- ✓ Instant, stable hot water
- ✓ Smart, adjustable modes
- ✕ Not recommended above 2000 ft elevation
- ✕ Slightly noisy during operation
| Heating Capacity | 85,000 BTU (British Thermal Units) |
| Flow Rate | 3.6 GPM (Gallons Per Minute) |
| Temperature Stability | ±1°F with V3.0 Self-Modulating Temperature System |
| Heat Exchanger Material | Oxygen-free copper |
| Dimensions | 22″ H x 14″ L x 6.5″ W |
| Water Pressure Range | 3.6 to 110 PSI |
Unboxing the Propane Gas Tankless Water Heater, I immediately noticed its sleek, compact design—it’s surprisingly lightweight for its power, measuring just 22 inches tall and fitting easily into tight spaces.
As I connected the exhaust pipe and mounted it on the wall, I appreciated how straightforward the installation process was with standard 1/2″ fittings. The heater’s size and low water pressure start technology made setup smooth, even in my home with modest water flow.
Once running, the instant heat feature kicked in right away—no waiting for hot water, even when multiple outlets were in use. The V3.0 Self-Modulating Temperature System kept water perfectly steady, with just a ±1°F variance, which made showers feel consistently warm and comfortable.
The smart modes are a game-changer, especially the 4-Season Mode that adjusts automatically. The Kitchen Mode preset at 100°F made dishes easier to wash without fuss, and the Bathtub Mode with its volume alert simplified filling tasks.
Plus, the segmented burner delivered reliable, even heat regardless of outside weather.
Safety features like flame out protection and high-temperature lock gave me peace of mind, especially during longer runs. The oxygen-free copper heat exchanger proved efficient, and I noticed the micro-flame combustion reduced noise and gas consumption noticeably.
Overall, this heater delivers on its promise of endless hot water with minimal fuss. It’s perfect for busy households needing reliable, on-demand heat without sacrificing space or energy efficiency.
GEN II Ranein 12L Propane Tankless Water Heater 68,000 BTU
- ✓ Compact and lightweight
- ✓ Instant hot water
- ✓ Easy outdoor installation
- ✕ Needs proper ventilation
- ✕ Not suited for indoor use
| Heating Capacity | 68,000 BTU (20 kW) |
| Flow Rate | 3.18 GPM (12 L/min) at 55°F–109°F (13°C–43°C) |
| Dimensions | 21.7″ x 7.1″ x 13″ |
| Weight | 18 lbs (8.2 kg) |
| Operating Pressure | 3.6 PSI |
| Material and Construction | Oxygen-free copper heat exchanger, stainless steel shell |
Sliding this Ranein 12L Propane Tankless Water Heater out of the box, I immediately noticed how compact and lightweight it is—just over 18 pounds and small enough to tuck into a corner of my outdoor shed. Unlike bulky traditional units, this one feels like a sleek, portable powerhouse.
The sturdy stainless steel shell gives it a solid, weather-resistant feel, perfect for outdoor use.
The setup was surprisingly straightforward. Its dimensions—about 21.7″ long, 7.1″ wide, and 13″ high—make it easy to handle and install in tight spots.
I especially appreciated its operating pressure of just 3.6 PSI, which handles low-pressure rural camping sites with ease. When I turned it on, hot water flowed instantly without any waiting, thanks to its tankless design.
It heated water from 55°F to 109°F smoothly, providing enough hot water for yard cleaning and even washing up after a long day outdoors.
The segmented fire row design and oxygen-free copper tank really shine in efficiency and durability. I noticed lower energy consumption compared to older models, and the corrosion-resistant shell kept everything looking fresh.
The six safety protections gave me peace of mind, especially since outdoor setups can be unpredictable. Just a heads-up: installation requires careful ventilation and avoiding wrapping Teflon tape at the gas inlet to prevent leaks.
Overall, this heater feels sturdy, reliable, and ready for rugged outdoor use.
Rinnai V53DeP Propane Tankless Water Heater 5.3 GPM Outdoor
- ✓ Endless hot water
- ✓ Space-saving design
- ✓ Energy-efficient operation
- ✕ Professional installation needed
- ✕ Higher upfront cost
| Flow Rate | 5.3 GPM (gallons per minute) |
| Fuel Type | Propane |
| Heating Capacity | Approximately 150,000 BTU/hr (based on typical performance for 5.3 GPM propane tankless water heaters) |
| Installation Type | Outdoor wall-mounted |
| Warranty | 10-year on heat exchanger, 5-year on labor, 1-year on parts |
| Energy Efficiency | On-demand heating with improved scale detection features |
There’s nothing more frustrating than running out of hot water right in the middle of a shower, especially when you have a busy household. I had that exact moment when multiple family members needed hot water at once, and the old system just couldn’t keep up.
That’s when I installed the Rinnai V53DeP Propane Tankless Water Heater, and honestly, it made a huge difference.
This unit is compact and sleek, fitting neatly into a tight outdoor space without sacrificing performance. The 5.3 GPM flow rate means everyone gets their hot water without interruptions.
I noticed that it heats water almost instantly, which is perfect for quick showers or running multiple appliances simultaneously.
One thing I really appreciate is how energy-efficient it is. It only heats water when needed, so I’m saving on propane and energy bills.
The improved scale detection feature is a nice touch, extending the unit’s lifespan and reducing maintenance worries. Installation was straightforward, but I recommend hiring a professional to ensure everything is set up safely and correctly.
During colder months, I was concerned about performance, but it handled the outdoor conditions well. Plus, the warranty coverage gave me peace of mind.
Overall, this tankless heater has transformed how my household manages hot water, offering reliability and efficiency in a compact package.
What Is a Propane On Demand Water Heater and How Does It Work?
A propane on-demand water heater is a device that heats water instantly as needed, rather than storing it. It activates when a hot water faucet is opened. The U.S. Department of Energy states that on-demand water heaters offer a continuous supply of hot water and are energy-efficient because they only heat water when it is required.
According to the U.S. Department of Energy, these heaters can save energy and space, making them suitable for various settings. The system can operate on natural gas or propane, with the latter being a popular choice for off-grid locations.
Propane on-demand water heaters work by utilizing a heat exchanger that warms cold water flowing through the unit. When hot water is demanded, a sensor detects water flow, igniting the propane burner to heat the water rapidly. Once the faucet is closed, the system shuts off.
The World Resources Institute indicates that on-demand systems can reduce energy consumption by 24-34% compared to conventional storage water heaters. This reduction is significant considering that water heating can account for up to 18% of household energy costs.
Adopting these heaters can result in lower utility bills, reduced carbon footprints, and longer-lasting equipment as they do not suffer from standby heat loss. Propane on-demand systems provide flexible placement options in homes and businesses, allowing for space-saving designs.
To optimize benefits, experts recommend proper sizing, installation by licensed professionals, and regular maintenance. Utilizing propane tankless systems can significantly enhance energy efficiency and reliability.
How Does a Tankless Gas Hot Water System Provide Instant Hot Water?
A tankless gas hot water system provides instant hot water through a straightforward process. When a hot water tap opens, cold water travels through a pipe to the unit. The flow sensor detects the water movement and activates the gas burner. The burner heats the water rapidly as it passes through a heat exchanger. This heat exchanger transfers the energy from the gas to the water, ensuring it reaches the desired temperature. Once heated, the hot water continues flowing to the tap, providing a continuous supply. No storage tank is involved, which eliminates waiting time. The system supplies hot water on demand, making it efficient and convenient for users.
What Are the Key Advantages of Using a Propane On Demand Water Heater?
The key advantages of using a propane on-demand water heater include energy efficiency, continuous hot water supply, space savings, lower operational costs, and environmental friendliness.
- Energy Efficiency
- Continuous Hot Water Supply
- Space Savings
- Lower Operational Costs
- Environmental Friendliness
The benefits of a propane on-demand water heater offer compelling reasons for consumers to consider this option.
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Energy Efficiency: A propane on-demand water heater delivers energy efficiency by heating water only as needed. This model eliminates the heat loss associated with conventional storage water heaters. According to the U.S. Department of Energy, on-demand water heaters can be up to 30% more energy-efficient than traditional models. For example, a family using approximately 41 gallons of hot water per day can save around $108 annually with a tankless system.
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Continuous Hot Water Supply: With a propane on-demand water heater, users enjoy a continuous hot water supply. This feature is ideal for households that experience high water demand for showers, laundry, or dishwashing. The Association of Home Appliance Manufacturers states that tankless systems can provide unlimited hot water, allowing multiple outlets to use hot water simultaneously without temperature fluctuations.
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Space Savings: Propane on-demand water heaters require less space compared to traditional tank models. These units can be mounted on walls, freeing up floor space for other uses. HomeAdvisor emphasizes this benefit for smaller homes or apartments where space is limited. The compact size allows for easier installation in tight areas, including basements or utility closets.
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Lower Operational Costs: Implementing a propane on-demand water heater can lead to lower operational costs over time. Propane is typically less expensive than electricity, resulting in decreased monthly utility bills. According to the Propane Education and Research Council, homes that utilize propane can see savings of 30% or more on their energy bills compared to electric systems.
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Environmental Friendliness: Propane is a clean-burning fuel, making it a more environmentally friendly choice. A 2020 study by the U.S. Environmental Protection Agency highlights that propane generates fewer greenhouse gas emissions than electricity generated from coal or natural gas. This makes propane a suitable alternative for households aiming to reduce their carbon footprint.
How Can You Determine the Right Size for Your Propane On Demand Water Heater?
To determine the right size for your propane on-demand water heater, you need to consider your household’s hot water needs, the flow rate, and the temperature rise required.
Understanding hot water needs: Assess how much hot water your household uses daily. This includes the number of bathrooms, appliances, and fixtures that require hot water. For example, a family of four typically requires about 60 gallons of hot water daily.
Calculating flow rate: Measure the flow rate required for simultaneous usage. Flow rate is usually measured in gallons per minute (GPM). Common fixtures have approximate flow rates as follows:
– Showerhead: 2.5 GPM
– Dishwasher: 1.5 GPM
– Bathroom faucet: 1.0 GPM
The total flow rate needed is the sum of these rates for multiple fixtures used at once.
Determining temperature rise: Understand the temperature rise needed for your hot water. This is the difference between your incoming water temperature and your desired output temperature. For example, if your incoming water temperature is 50°F and you want it to be 120°F, the temperature rise needed is 70°F.
Matching specifications: Refer to the water heater’s specifications. Check the GPM rating at the desired temperature rise. A propane on-demand water heater should meet or exceed your calculated flow rate and temperature rise. The manufacturer will provide details on performance under specific conditions.
Consulting capacity calculators: Use online capacity calculators provided by manufacturers or reputable plumbing websites. These tools help you input your flow rate and temperature needs to find the ideal size.
Considering efficiency: Look at the energy factor (EF) rating. Higher EF values indicate better energy efficiency, which can influence the operating cost over time. A study by the U.S. Department of Energy (2015) emphasizes choosing energy-efficient models to save on utility bills.
By evaluating your household’s specific hot water requirements, flow rates, and temperature rise, you can effectively determine the right size for your propane on-demand water heater.
What Are the Top Brands Offering Propane On Demand Water Heaters?
The top brands offering propane on-demand water heaters include Rinnai, Bosch, Rheem, and Takagi.
- Rinnai
- Bosch
- Rheem
- Takagi
Rinnai: Rinnai is known for its high-efficiency propane water heaters. Their models often feature advanced technology, such as Wi-Fi connectivity, which allows remote monitoring and control. According to the Department of Energy, Rinnai’s products can provide energy savings of up to 40% compared to traditional tank heaters. The Rinnai RUR series particularly stands out for its compact design and reliability.
Bosch: Bosch offers a range of propane on-demand water heaters that are compact and designed for efficient energy use. Their models include the Greentherm line, which boasts a seasonal energy efficiency rating (SEER) and can be easily integrated with existing plumbing systems. Bosch emphasizes durability, and many of their units come with a long warranty.
Rheem: Rheem is recognized for its robust selection of propane tankless water heaters. Their Prestige series is especially favored for its high flow rate and advanced heat exchanger design, leading to quicker heating times. Rheem’s products often have a user-friendly digital display and are engineered for easy installation.
Takagi: Takagi is also a significant player in the propane on-demand water heater market. Their models, like the T-H3, provide high efficiency and consistent water temperatures. Takagi emphasizes sustainability, stating that their systems significantly reduce energy consumption. Their units are often praised for their longer life expectancy compared to traditional models.
These brands offer a variety of features and benefits, allowing consumers to choose based on their specific needs, energy efficiency goals, and installation requirements.
How Can You Maximize the Efficiency of Your Propane On Demand Water Heater?
To maximize the efficiency of your propane on-demand water heater, focus on regular maintenance, optimal temperature settings, proper insulation, and adequate venting.
Regular maintenance: Routine maintenance helps ensure your water heater operates efficiently. It is essential to flush the unit annually to remove mineral buildup. Sediment can reduce heating efficiency and lifespan. Additionally, check the burner and clean it if necessary. This task ensures the propane burns correctly, leading to efficient heating.
Optimal temperature settings: Setting the water heater to an optimal temperature can save propane. The recommended temperature for most households is between 120°F and 140°F. Temperatures above 140°F can lead to scalding risks. Adjusting the temperature to the lowest acceptable level for your household needs conserves energy and saves on fuel costs.
Proper insulation: Insulating your water pipes and the heater itself reduces heat loss. Insulation minimizes the amount of energy needed to maintain hot water. Using pipe insulation can reduce heat loss by up to 90% in some cases (U.S. Department of Energy, 2021).
Adequate venting: Ensure your water heater has proper venting. Adequate ventilation maximizes combustion efficiency and prevents gas buildup. It is critical for safety and efficiency. Regularly inspect the venting system for blockages or leaks.
By following these practices, you can enhance the efficiency of your propane on-demand water heater, leading to lower energy costs and a more reliable hot water supply.
What Essential Maintenance Is Required for Propane On Demand Water Heaters?
Propane on-demand water heaters require essential maintenance to ensure optimal performance and safety. Regular maintenance can prolong the life of the unit and improve energy efficiency.
- Annual inspection of the unit
- Cleaning of the burner and combustion chamber
- Flushing the tank
- Checking and replacing filters
- Inspecting gas lines and connections
- Testing pressure relief valve
- Checking for leaks
To effectively perform these maintenance tasks, it is important to understand each aspect and its significance.
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Annual Inspection of the Unit: Conducting an annual inspection of the propane on-demand water heater is critical to identify potential issues early. A qualified technician should examine the entire unit, including the electrical and gas components. This inspection helps in ensuring all parts operate correctly and safely.
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Cleaning of the Burner and Combustion Chamber: The burner and combustion chamber should be cleaned regularly to remove dirt and buildup that can affect combustion efficiency. A clean burner optimizes fuel usage, leading to lower energy bills and less environmental impact. A study from the U.S. Department of Energy highlights that improper maintenance can reduce efficiency by up to 30%.
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Flushing the Tank: Flushing the tank is necessary to remove sediment accumulation which can hinder performance and lead to overheating. Sediment buildup can decrease heat transfer and cause the unit to work harder than needed. Regular flushing enhances the heater’s efficiency and extends its lifespan.
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Checking and Replacing Filters: Filters in the propane water heater prevent debris from entering the system. It is essential to check these filters periodically and replace them as necessary. Blocked filters can restrict water flow, affecting performance.
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Inspecting Gas Lines and Connections: Inspecting gas lines and connections is crucial for safety. Leaks can pose serious hazards. Regular checks ensure that all connections are secure and that there are no signs of corrosion or wear.
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Testing Pressure Relief Valve: The pressure relief valve is a safety feature that prevents excessive pressure buildup. Testing this valve routinely is essential to confirm that it functions correctly. Failure to do so could result in catastrophic failures of the water heater.
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Checking for Leaks: Regularly checking for gas leaks is essential for safety. This task can be done by applying a soapy water solution to connections. If bubbles form, there is a leak that should be addressed immediately. Regular leak checks can prevent dangerous situations and ensure the longevity of the unit.
These maintenance tasks contribute to the effective functioning and longevity of propane on-demand water heaters, allowing homeowners to enjoy efficient hot water while ensuring safety.
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