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10 Best Tankless Rv 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 and Multi-function Controller, On Demand Instant Hot Water Heater

Rating
10.0
Chosen by1,365
Flow Rate
Energy Efficiency
Temperature Control

Most important from
457 reviews

Flow Rate
Hot water is available within 30 seconds of turning on the heater.
Energy Efficiency
The unit is half the cost of traditional water heaters, with superior performance.
Temperature Control
Performs well even in freezing temperatures, maintaining consistent hot water output.
Installation and Maintenance
The support from Ranein is excellent, with quick responses to installation queries.

The Ranein 65,000 BTU RV Tankless Water Heater stands out for its high performance and adaptability. With a maximum flow rate of 3.9 gallons per minute, it ensures a steady supply of hot water, which is a significant upgrade over traditional tank water heaters that can run out of hot water quickly. The heater operates on propane gas and requires a 12V power source, making it suitable for most RVs. It is also CSA certified, ensuring safety and reliability during use.

A major advantage is its thermostatic chamber, which helps maintain a consistent water temperature between 95°F and 124°F, preventing overheating and conserving propane. The inclusion of a multi-function remote control adds convenience by allowing users to monitor gas usage, voltage, and other functions from a distance. Installation is simplified with the unit's ability to replace existing Suburban and Atwood's tank water heaters, though buyers should note that the door kit must be purchased separately.

It is designed for high-altitude use and includes safety features like an anti-freeze device and automatic gas shut-off.

Rating
10.0
Chosen by1,365
Flow Rate
Energy Efficiency
Temperature Control

Most important from
457 reviews

Flow Rate
Hot water is available within 30 seconds of turning on the heater.
Energy Efficiency
The unit is half the cost of traditional water heaters, with superior performance.
Temperature Control
Performs well even in freezing temperatures, maintaining consistent hot water output.
Installation and Maintenance
The support from Ranein is excellent, with quick responses to installation queries.
#2

FOGATTI RV Tankless Water Heater, InstaShower 8 Plus, Gen 2, with 15 x 15 inches Black Door and Remote Controller, DC 12V, Best High Altitude Performance, Ideal for RVers' Everyday Use

Rating
10.0
Flow Rate
Size and Weight
Temperature Control

Most important from
1057 reviews

Flow Rate
Fast, consistent, never-ending hot water.
Size and Weight
A very good addition to my RV; everything fit just like it was supposed to from the webpage dimensions.
Temperature Control
Setting the water thermostat to your desired temperature means no more blending cold water, and it's always the perfect temp.
Installation and Maintenance
Installation was super easy, much easier than removing the old unit.

The FOGATTI RV Tankless Water Heater, InstaShower 8 Plus, Gen 2, is a versatile and robust option for RVers. One of its standout features is its high altitude suitability mode, which ensures smooth operation even at elevations as high as 9,800 feet, making it ideal for adventurers traveling through mountainous regions. With a high flow rate of up to 2.9 GPM and a powerful 55,000 BTU output, this heater provides continuous hot water for extended periods, which is a significant upgrade from traditional tank water heaters that can run out quickly.

The staged combustion technology adds to its efficiency by regulating the flame in different seasons, thus conserving propane gas. Additionally, the product dimensions (15 x 15 inches) and included door facilitate an easy replacement for most existing RV water heaters. The installation is further simplified by the included pressure relief valve and intelligent remote controller. Safety is a priority with CSA certification and multiple protection features, including overheat, overpressure, and anti-freeze protections.

It uses propane as its fuel, which, while efficient, requires users to manage propane supplies. The DC 12V power requirement also means it is reliant on the RV's electrical system. Though it is equipped with numerous safety measures and enhanced functionality, it may require professional installation for some users due to its integration with gas and water lines. The FOGATTI RV Tankless Water Heater is a highly efficient, reliable, and user-friendly option for RVers who prioritize continuous hot water and travel to various elevations.

Rating
10.0
Flow Rate
Size and Weight
Temperature Control

Most important from
1057 reviews

Flow Rate
Fast, consistent, never-ending hot water.
Size and Weight
A very good addition to my RV; everything fit just like it was supposed to from the webpage dimensions.
Temperature Control
Setting the water thermostat to your desired temperature means no more blending cold water, and it's always the perfect temp.
Installation and Maintenance
Installation was super easy, much easier than removing the old unit.
#3

FOGATTI RV Tankless Water Heater, InstaShower 7, Gen 2, with 15 x 15 inches Black Door and Remote Controller, DC 12V, Optimized Summer Comfort Performance, Ideal for RVers' Family Use

Rating
9.9
Size and Weight
Temperature Control
Installation and Maintenance

Most important from
1057 reviews

Size and Weight
The unit's compact dimensions fit perfectly as described, and it works excellently, making it a great choice for RV upgrades.
Temperature Control
Unlimited hot water set to your desired temperature is truly glorious, eliminating the need to blend cold water and wait between showers.
Installation and Maintenance
Straightforward and easy to install, the FOGATTI InstaShower 7 is a fantastic addition to my RV, providing fast and consistent hot water.

The FOGATTI InstaShower 7 tankless RV water heater offers several advantages for RV users seeking a reliable and efficient hot water source. With a maximum flow rate of 2.5 gallons per minute (GPM), it can provide continuous hot water for multiple showers without the need for waiting periods. This is particularly beneficial for families or groups traveling together in an RV. The 48,000 BTU power ensures sufficient heating capacity, and the product runs on DC 12V, which is suitable for RV electrical systems. Its compact size (15 x 15 inches) makes it a good fit for replacing many existing RV water heaters, though some larger units may require door retrofitting.

Energy efficiency features such as staged combustion technology prevent overheating and save propane, making it economical for long trips. Additionally, the high-altitude mode ensures reliable performance even in elevated locations, up to 9,800 feet, which is ideal for adventurous RVers. Installation and maintenance are simplified with the inclusion of a pressure relief valve, remote controller, and clear safety features, such as overheat and anti-freezing protection, which enhance the product's reliability.

However, it is essential to consider that the installation may require some modifications if replacing larger tank water heaters, which could add to the initial setup time and cost. Furthermore, while the remote control and intelligent error indicators are convenient, users unfamiliar with advanced tech features may need a learning curve to fully utilize them. Despite these minor drawbacks, the FOGATTI InstaShower 7 provides an efficient and safety-conscious solution for RV hot water needs.

Rating
9.9
Size and Weight
Temperature Control
Installation and Maintenance

Most important from
1057 reviews

Size and Weight
The unit's compact dimensions fit perfectly as described, and it works excellently, making it a great choice for RV upgrades.
Temperature Control
Unlimited hot water set to your desired temperature is truly glorious, eliminating the need to blend cold water and wait between showers.
Installation and Maintenance
Straightforward and easy to install, the FOGATTI InstaShower 7 is a fantastic addition to my RV, providing fast and consistent hot water.

Buying Guide for the Best Tankless Rv Water Heaters

Choosing the right tankless RV water heater can significantly enhance your comfort while traveling. Unlike traditional water heaters, tankless models provide hot water on demand, which means you don't have to wait for a tank to heat up. This can be particularly useful in an RV where space and resources are limited. To make an informed decision, it's important to understand the key specifications and how they align with your needs.
Flow RateFlow rate, measured in gallons per minute (GPM), indicates how much hot water the heater can produce at a time. This is crucial because it determines whether you can run multiple fixtures simultaneously without losing hot water. For instance, a flow rate of 2-3 GPM is typically sufficient for one shower or a sink, while 4-6 GPM can handle multiple fixtures. Consider your usage patterns: if you often use hot water in more than one place at a time, opt for a higher flow rate.
Fuel TypeTankless RV water heaters can be powered by propane, electricity, or a combination of both. Propane models are popular for their efficiency and ability to heat water quickly, making them ideal for off-grid use. Electric models are easier to install and maintain but may require a significant power supply, which can be a limitation in some RVs. Dual-fuel models offer flexibility but can be more expensive. Choose based on your RV's power setup and your travel habits.
Energy EfficiencyEnergy efficiency is measured by the unit's energy factor (EF), which indicates how well the heater converts fuel into hot water. A higher EF means better efficiency and lower operating costs. For RVs, where conserving energy is often a priority, look for models with a high EF rating. This not only saves fuel or electricity but also reduces your environmental footprint.
Size and WeightThe size and weight of the tankless water heater are important considerations, especially in an RV where space is limited. Compact and lightweight models are easier to install and fit into tight spaces. However, ensure that the unit is still powerful enough to meet your hot water needs. Measure the available space in your RV and compare it with the dimensions of the heater to ensure a proper fit.
Temperature ControlTemperature control features allow you to set and maintain your desired water temperature. Some models offer digital displays and precise temperature settings, which can enhance comfort and prevent scalding. Basic models may have manual controls that are less precise but still functional. Consider how important precise temperature control is for you and choose a model that offers the level of control you need.
Installation and MaintenanceEase of installation and maintenance can vary between models. Some tankless water heaters are designed for DIY installation, while others may require professional help. Maintenance features, such as easy access to components and self-cleaning functions, can prolong the life of the unit and reduce the need for repairs. If you're handy and prefer to do things yourself, look for user-friendly models. Otherwise, consider the availability of professional service options.

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