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10 Best Rv Tankless Water Heaters 2025 in the United States
#1
Winner
2025 GEN II Ranein On-Demand 65,000 BTU RV Tankless Water Heater, 12V Powered, High Altitude Ready, CSA Approved, With Multi-Function Controller and Thermostatic Chamber
The 2025 GEN II Ranein On-Demand RV Tankless Water Heater offers a strong combination of power and convenience for RV users who need a dependable source of hot water. With a heating capacity of 65,000 BTU and a flow rate of up to 3.9 gallons per minute, it provides continuous hot water, making it ideal for full-time RVers or those who enjoy longer showers. The unit runs on 12V power, which suits typical RV electrical systems, and it is designed to work well even at high altitudes up to 9,800 feet—a plus for mountain travelers. Its thermostatic chamber keeps water temperature steady, so you won’t experience sudden cold or hot bursts during showers.
Rating
10.0
Chosen by1,436
Temperature Control
Installation and Maintenance
Most important from
28 reviews
#2
FOGATTI RV Tankless Water Heater, 66,000 Highest BTU, 0.5-3.6 GPM Energy-Efficiency, Built-in Mixing Tank, 15x15 Inches Gray Door, Remote Controller, Ideal for Everyday Use by RVers, InstaShower Ultra
The FOGATTI InstaShower Ultra is a powerful tankless water heater designed specifically for RV users who want reliable hot water on the go. With a strong heat output of 66,000 BTU, it can deliver hot water at up to 3.6 gallons per minute, enough to use the shower and kitchen faucet simultaneously without running out of hot water. This makes it a great choice for daily RV use or for families who need consistent water flow. It uses a 12-volt energy source and has an eco-friendly low flow startup that conserves energy when water demand is low. The unit is fairly compact, measuring 15 by 15 inches and weighing around 34 pounds, fitting well in most RVs but possibly requiring professional help to install. Temperature control is impressive, with precise adjustment within 1 degree Fahrenheit and a built-in mixing tank to prevent sudden hot or cold bursts, ensuring comfortable and stable water temperature regardless of outside weather.
Rating
9.4
Flow Rate
Energy Source
Size and Weight
Most important from
10 reviews
#3
Ranein 65,000 BTU RV Tankless Water Heater, High Altitude Available, 12V, CSA Certificated, with Thermostatic Chamber and Multi-function Controller, On Demand Instant Hot Water Heater
The Ranein 65,000 BTU RV Tankless Water Heater offers several strong features tailored for RV use. One of its standout advantages is the high flow rate of up to 3.9 gallons per minute, which ensures a consistent supply of hot water on demand, making it ideal for longer showers. The unit operates on a 12V DC power source and includes a built-in anti-freeze device, making it reliable in colder climates.
Rating
9.4
Flow Rate
Temperature Control
Installation and Maintenance
Most important from
620 reviews
Top 10 Best Rv Tankless Water Heaters 2025 in the United States
#1
Winner
2025 GEN II Ranein On-Demand 65,000 BTU RV Tankless Water Heater, 12V Powered, High Altitude Ready, CSA Approved, With Multi-Function Controller and Thermostatic Chamber
2025 GEN II Ranein On-Demand 65,000 BTU RV Tankless Water Heater, 12V Powered, High Altitude Ready, CSA Approved, With Multi-Function Controller and Thermostatic Chamber
Flow Rate: 3.9 gallons per minute
Energy Source: 12V power
Size and Weight: 15 x 15 inches, 27.5 lbs
Temperature Control: thermostatic chamber
Installation and Maintenance: straightforward, may need door kit
Safety Features: exhaust fan, auto gas shut-off
Chosen by 1436 this week
FOGATTI RV Tankless Water Heater, 66,000 Highest BTU, 0.5-3.6 GPM Energy-Efficiency, Built-in Mixing Tank, 15x15 Inches Gray Door, Remote Controller, Ideal for Everyday Use by RVers, InstaShower Ultra
FOGATTI RV Tankless Water Heater, 66,000 Highest BTU, 0.5-3.6 GPM Energy-Efficiency, Built-in Mixing Tank, 15x15 Inches Gray Door, Remote Controller, Ideal for Everyday Use by RVers, InstaShower Ultra
Flow Rate: 3.6 Gallons Per Minute
Energy Source: 12 Volts DC
Size and Weight: 15"W x 15"H, 34.1 lbs
Temperature Control: Precise 1°F adjustment, mixing tank
Installation and Maintenance: Professional install, venting, regular maintenance
Safety Features: Flame failure, oxygen shut-off, overheat
Ranein 65,000 BTU RV Tankless Water Heater, High Altitude Available, 12V, CSA Certificated, with Thermostatic Chamber and Multi-function Controller, On Demand Instant Hot Water Heater
Ranein 65,000 BTU RV Tankless Water Heater, High Altitude Available, 12V, CSA Certificated, with Thermostatic Chamber and Multi-function Controller, On Demand Instant Hot Water Heater
Flow Rate: 3.9 Gallons Per Minute
Energy Source: 12 Volts (DC)
Size and Weight: 15"W x 15"H, 31.2 lbs
Temperature Control: Max Temp: 124°F
Installation and Maintenance: Mounting: Door Mount
Safety Features: Auto gas shut-off, exhaust fan, CSA
Ranein 65,000 BTU RV Tankless Water Heater, High Altitude Available, 12V, CSA Certificated, with Multi-function Controller, On Demand Instant Hot Water Heater, Compatible with all RVs
Ranein 65,000 BTU RV Tankless Water Heater, High Altitude Available, 12V, CSA Certificated, with Multi-function Controller, On Demand Instant Hot Water Heater, Compatible with all RVs
Flow Rate: 3.9 GPM
Energy Source: Propane, 12V power supply
Size and Weight: 15" x 15", 5.48 lbs
Temperature Control: 95°F-124°F
Installation and Maintenance: Wall mounting, door kit sold separately
Safety Features: Forced exhaust fan, gas shut-off, anti-freeze
2025 GEN II Ranein On-Demand 65,000 BTU RV Tankless Water Heater, 12V Powered, High Altitude Ready, CSA Approved, With Multi-Function Controller, Works with All RV Models
2025 GEN II Ranein On-Demand 65,000 BTU RV Tankless Water Heater, 12V Powered, High Altitude Ready, CSA Approved, With Multi-Function Controller, Works with All RV Models
Flow Rate: 3.9 gallons per minute
Energy Source: 12 volts and propane
Size and Weight: 15"W x 15"H, 27 lbs
Temperature Control: Remote, 95°F to 124°F
Installation and Maintenance: Easy replacement, door kit separate
Safety Features: Auto gas shut-off, pressure valve
Related Products
GIRARD Tankless RV Water Heater, 12V Power, 42,000 BTUs, Quiet Operation, Onboard Microprocessor, Digital User Control Panel, Freeze Protection, Easy Installation - 2022107534
GIRARD Tankless RV Water Heater, 12V Power, 42,000 BTUs, Quiet Operation, Onboard Microprocessor, Digital User Control Panel, Freeze Protection, Easy Installation - 2022107534
Energy Source: 12V power
Size and Weight: 12.5"W x 12.5"H x 13.75"D, 22 lbs
Temperature Control: Microprocessor, digital control panel
Installation and Maintenance: Professional installation recommended
Safety Features: Prevents cold spots, scalding
FOGATTI RV Tankless Water Heater, with 15 x 15 inches Black Door and Remote Controller, DC 12V, Best High Altitude Performance, Ideal for RVers' Everyday Use, InstaShower 8 Plus, Gen 2
FOGATTI RV Tankless Water Heater, with 15 x 15 inches Black Door and Remote Controller, DC 12V, Best High Altitude Performance, Ideal for RVers' Everyday Use, InstaShower 8 Plus, Gen 2
Flow Rate: 2.9 gallons per minute
Energy Source: Propane
Size and Weight: 15"W x 15"H
Temperature Control: Wired remote controller
Installation and Maintenance: Straightforward installation, replaces various heaters
Safety Features: Anti-freeze, overheat, auto gas shut-off
FOGATTI RV Tankless Water Heater, 66,000 Highest BTU, RV Hot Water Heater, Built-in Mixing Tank, 15x15 Inches White Door, Remote Controller, Ideal for Everyday Use by RVers, InstaShower 9 Pro, Gen 3
FOGATTI RV Tankless Water Heater, 66,000 Highest BTU, RV Hot Water Heater, Built-in Mixing Tank, 15x15 Inches White Door, Remote Controller, Ideal for Everyday Use by RVers, InstaShower 9 Pro, Gen 3
Flow Rate: 3.6 Gallons Per Minute
Energy Source: Propane with 12-volt control
Size and Weight: 15" x 15", 31 pounds
Temperature Control: Precise control within 1°F
Installation and Maintenance: Pressure relief valve, remote controller
Safety Features: Anti-freeze, flame failure, overheat protection
FOGATTI RV Tankless Water Heater, 3 Optional Door Sizes 15"x15", 15"x18" and 18"x18" for Refitment, DC 12V, Optimized Summer Comfort Performance, Ideal for RVers' Family Use, InstaShower 7
FOGATTI RV Tankless Water Heater, 3 Optional Door Sizes 15"x15", 15"x18" and 18"x18" for Refitment, DC 12V, Optimized Summer Comfort Performance, Ideal for RVers' Family Use, InstaShower 7
Flow Rate: 2.5 gallons per minute
Energy Source: 12V DC
Size and Weight: 12.7"W x 12.7"H, 25.7 lbs
Temperature Control: Adjustable 95°F-123°F, remote, high-altitude
Installation and Maintenance: Three door sizes, easier maintenance
Safety Features: Pressure relief valve, exhaust fan, gas shut-off
#10
Suburban RV Tankless 42,000 BTU Water Heater - Endless Hot Water Supply, Energy Saving, Digital User Control Center, Designed for Safety, Freeze Protection (ST-42)
Suburban RV Tankless 42,000 BTU Water Heater - Endless Hot Water Supply, Energy Saving, Digital User Control Center, Designed for Safety, Freeze Protection (ST-42)
Flow Rate: 42,000 BTU
Energy Source: Propane
Size and Weight: 12.5"W x 12.5"H, 1 lb
Temperature Control: Digital control, child lock, max 131°F
Installation and Maintenance: Needs specific door, may need pro
Safety Features: Flame out, scald, child lock, freeze
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Buying Guide for the Best Rv Tankless Water Heaters
Choosing the right RV tankless water heater can significantly enhance your comfort while traveling. These devices provide a continuous supply of hot water, which is essential for showers, washing dishes, and other daily activities. When selecting an RV tankless water heater, it's important to consider several key specifications to ensure you get the best fit for your needs. Understanding these specs will help you make an informed decision and enjoy a reliable hot water supply on your adventures.Flow RateFlow rate, measured in gallons per minute (GPM), indicates how much hot water the heater can produce. This is crucial because it determines whether you can run multiple fixtures simultaneously without losing hot water. Lower flow rates (1-2 GPM) are suitable for small RVs or single-use scenarios like a shower. Medium flow rates (2-4 GPM) can handle a shower and a sink at the same time. Higher flow rates (4+ GPM) are ideal for larger RVs or when multiple hot water demands occur simultaneously. Choose a flow rate based on the number of people using hot water and the number of fixtures you plan to run at once.
Energy SourceRV tankless water heaters can be powered by propane, electricity, or a combination of both. Propane heaters are popular for their efficiency and ability to heat water quickly, making them ideal for off-grid camping. Electric heaters are convenient when you have access to shore power but may struggle to keep up with high demand. Combination units offer flexibility, allowing you to switch between propane and electric depending on availability. Consider your typical camping setup and choose an energy source that aligns with your power availability and usage patterns.
Size and WeightThe size and weight of the water heater are important for installation and space considerations in your RV. Compact and lightweight models are easier to install and fit into tight spaces, which is crucial in smaller RVs. Larger units may offer higher performance but require more space and may be more challenging to install. Assess the available space in your RV and ensure the unit you choose can be accommodated without compromising other essential areas.
Temperature ControlTemperature control features allow you to set and maintain your desired water temperature. Basic models may have manual controls, while advanced units offer digital displays and precise temperature settings. Consistent temperature control is important for comfort and safety, preventing scalding or cold water surprises. If you prefer ease of use and precise control, look for models with advanced temperature control features. For those who are comfortable with manual adjustments, simpler models may suffice.
Installation and MaintenanceConsider the ease of installation and maintenance when choosing an RV tankless water heater. Some models come with DIY-friendly installation kits, while others may require professional installation. Regular maintenance, such as descaling and cleaning, is necessary to keep the unit running efficiently. Look for models with accessible components and clear maintenance instructions. If you prefer minimal maintenance, opt for units with self-cleaning features or those that are known for their reliability and low upkeep.
Safety FeaturesSafety features are essential to prevent accidents and ensure safe operation. Common safety features include flame failure devices, overheat protection, and anti-freeze protection. These features help prevent dangerous situations like gas leaks, overheating, and freezing in cold weather. Prioritize models with comprehensive safety features, especially if you plan to use the heater in varying weather conditions or if you have children or pets in the RV.