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10 Best Rv Tankless Water Heaters 2025 in the United States

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Our Top Picks

#1

Winner

Ranein 65,000 BTU RV Tankless Water Heater, High Altitude Available, 12V, CSA Certificated, with Thermostatic Chamber, External Shower and Multi-function Controlle, Ldeal for Travel and Daily Use

Rating
9.9
Chosen by1,209
Flow Rate
Size and Weight
Temperature Control

Most important from
555 reviews

Flow Rate
Hot water delivery is quick and consistent, providing hotter water than expected right at the faucet.
Size and Weight
The unit’s size and compatibility make it a perfect replacement for traditional tank heaters, reusing existing covers and spaces.
Temperature Control
The thermostat controls are simple and effective, enabling precise temperature settings that eliminate the need for mixing with cold water.
Installation and Maintenance
Installation is straightforward, fitting easily into existing RV heater openings and allowing for a DIY setup with clear wiring instructions.
Safety Features
Users appreciate the thoughtful safety features, such as automatic gas shutoff and anti-freeze function, which enhance reliability in various conditions.

The Ranein 65,000 BTU RV tankless water heater is designed to provide continuous hot water for RV travelers, eliminating the usual wait time associated with traditional tank heaters. It offers a strong flow rate of up to 3.9 gallons per minute, which is usually enough for quick showers or washing. Powered by 12V DC and propane gas, it’s suitable for most RV setups that use these energy sources. Its size (15" by 15") fits standard RV heater openings, making replacement straightforward, especially if upgrading from popular brands like Suburban or Atwood.

The unit includes a thermostatic chamber that helps keep water temperature steady between 95°F and 124°F, reducing the risk of scalding — a handy safety feature for families or pets. Installation is made easier with the included external shower and a remote controller, plus it has a built-in pressure relief valve, so you don’t have to buy extra parts. Safety is well addressed here, with features like an automatic gas shutoff if the flame goes out, a forced exhaust fan for steady combustion, and an anti-freeze function that activates in cold weather to prevent damage.

One potential drawback is its weight at nearly 30 pounds, which might be a bit heavy for some users to handle during installation. Also, the maximum temperature tops out at 124°F, which is comfortable and safe, but warmer water lovers might find it a bit limiting. This model serves as a practical and efficient choice for RV owners who want a reliable, quiet heater with easy temperature control and added outdoor shower convenience.

Rating
9.9
Chosen by1,209
Flow Rate
Size and Weight
Temperature Control

Most important from
555 reviews

Flow Rate
Hot water delivery is quick and consistent, providing hotter water than expected right at the faucet.
Size and Weight
The unit’s size and compatibility make it a perfect replacement for traditional tank heaters, reusing existing covers and spaces.
Temperature Control
The thermostat controls are simple and effective, enabling precise temperature settings that eliminate the need for mixing with cold water.
Installation and Maintenance
Installation is straightforward, fitting easily into existing RV heater openings and allowing for a DIY setup with clear wiring instructions.
Safety Features
Users appreciate the thoughtful safety features, such as automatic gas shutoff and anti-freeze function, which enhance reliability in various conditions.
#2

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

Rating
9.8
Flow Rate
Temperature Control
Installation and Maintenance

Most important from
555 reviews

Flow Rate
We can wash dishes and take endless showers and never run out of hot water.
Temperature Control
It's doing great. I spent November and December in Ohio where it got down into the teens for several nights. It still had no trouble making 124 degrees.
Installation and Maintenance
It was also easy to install the control box inside the RV at our control board location for the rest of the RV using the old wires from the old water heater.

The Ranein 65,000 BTU RV Tankless Water Heater is a solid choice for RV owners looking for instant hot water. It offers a high flow rate of up to 3.9 GPM, ensuring a consistent supply of hot water on demand, ideal for those who dislike waiting for water to heat up. The unit is powered by propane and requires a 12V power supply, making it compatible with all RVs, though it's not electric. The heater's compact dimensions (15" x 15") facilitate easy installation, especially since it can replace various sizes of existing tank water heaters with appropriate door kits (sold separately).

The inclusion of a multi-function remote control allows users to monitor gas usage, voltage, and other parameters, which can be very convenient. Additionally, the product features staged combustion technology to maintain a steady temperature range of 95°F-124°F, enhancing comfort and propane efficiency. Safety features are robust, including a built-in forced exhaust fan for stable combustion, automatic gas shut-off for flame failure, and an anti-freeze device that activates at low temperatures.

However, the need to purchase the door separately adds to the cost and complexity of installation. The built-in pressure relief valve, CSA certification, and professional customer service are added benefits. This water heater is best suited for RV owners seeking a reliable, high-performance tankless water heater that offers advanced control and safety features.

Rating
9.8
Flow Rate
Temperature Control
Installation and Maintenance

Most important from
555 reviews

Flow Rate
We can wash dishes and take endless showers and never run out of hot water.
Temperature Control
It's doing great. I spent November and December in Ohio where it got down into the teens for several nights. It still had no trouble making 124 degrees.
Installation and Maintenance
It was also easy to install the control box inside the RV at our control board location for the rest of the RV using the old wires from the old water heater.
#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

Rating
9.7
Flow Rate
Temperature Control
Installation and Maintenance

Most important from
555 reviews

Flow Rate
The T&P valve leaks above 60 psi, but using a regulator helps, although it limits volume for running multiple devices.
Temperature Control
The heater handles cold temperatures well, maintaining 124 degrees even when the inlet is near freezing.
Installation and Maintenance
Installing the control box inside the RV using old wires from the previous water heater was easy.

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.

The product also features a multi-function remote control that allows you to monitor various aspects such as gas usage, voltage, and whether the anti-freeze device is active. This can be particularly handy for RV owners who need to manage resources efficiently while on the road. Additionally, the heater incorporates safety features like an automatic gas shut-off in case of flame failure and a forced exhaust fan for stable combustion. The CSA certification further adds to its reliability and safety credentials.

However, there are some drawbacks to consider. The unit does not come with the necessary door, which has to be purchased separately, adding to the cost. Installation might also require some adjustments, particularly if replacing older Suburban or Atwood models. Despite these minor downsides, this tankless water heater is a robust option for RV owners looking for efficiency and reliability in their hot water supply.

Rating
9.7
Flow Rate
Temperature Control
Installation and Maintenance

Most important from
555 reviews

Flow Rate
The T&P valve leaks above 60 psi, but using a regulator helps, although it limits volume for running multiple devices.
Temperature Control
The heater handles cold temperatures well, maintaining 124 degrees even when the inlet is near freezing.
Installation and Maintenance
Installing the control box inside the RV using old wires from the previous water heater was easy.

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.

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