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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
9.9
Chosen by1,452
Flow Rate
Energy Efficiency
Temperature Control

Most important from
553 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
9.9
Chosen by1,452
Flow Rate
Energy Efficiency
Temperature Control

Most important from
553 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.
#3

FOGATTI RV Tankless Water Heater, InstaShower 7, 3 Optional Door Sizes 15"x15", 15"x18" and 18"x18" for Refitment, DC 12V, Optimized Summer Comfort Performance, Ideal for RVers' Family Use

Rating
9.7
Flow Rate
Installation and Maintenance
Energy Efficiency

Most important from
71 reviews

Flow Rate
Provides virtually unlimited hot water, making it a reliable choice for continuous use.
Installation and Maintenance
Installation is straightforward and manageable, even for those without extensive plumbing experience.
Energy Efficiency
Significantly more efficient than traditional tank water heaters, saving fuel and space.
Size and Weight
Compact design fits well in most RV setups, complementing its user-friendly remote temperature control.
Temperature Control
Compact design fits well in most RV setups, complementing its user-friendly remote temperature control.

The FOGATTI InstaShower 7 is a solid choice for RV owners looking for a reliable tankless water heater. It offers a strong flow rate of 2.5 gallons per minute with a heat output of 48,000 BTU, which is enough for multiple family members to enjoy hot water without waiting. Running on 12V DC power and boasting an 84% energy efficiency, it’s designed to save fuel by heating water only when needed. The unit is fairly compact (12.7" x 12.7") and weighs about 25.7 pounds, making it suitable for wall mounting in most RVs. It comes with three door size options (sold separately) to fit existing heater cutouts, which simplifies replacement or upgrades. Temperature control is user-friendly via a remote controller, allowing adjustments between 95°F and 123°F, plus special features like staged combustion help keep water temperature steady without cold or scalding spots.

Safety is well-covered with built-in protections including dry combustion prevention, overheat protection, antifreeze defense, and an automatic gas shut-off. The heater also works well at high altitudes, which is a plus for mountain RV trips. On the downside, the door panels cost extra and the unit requires a gas supply (not electric) which might need some plumbing know-how during installation. Also, while the heater is efficient, it still uses propane gas, so fuel consumption should be considered.

The FOGATTI InstaShower 7 provides dependable and efficient hot water delivery for families on the road. Its thoughtful safety and comfort features make it a practical solution, though installation and selecting the correct door size may require some effort.

Rating
9.7
Flow Rate
Installation and Maintenance
Energy Efficiency

Most important from
71 reviews

Flow Rate
Provides virtually unlimited hot water, making it a reliable choice for continuous use.
Installation and Maintenance
Installation is straightforward and manageable, even for those without extensive plumbing experience.
Energy Efficiency
Significantly more efficient than traditional tank water heaters, saving fuel and space.
Size and Weight
Compact design fits well in most RV setups, complementing its user-friendly remote temperature control.
Temperature Control
Compact design fits well in most RV setups, complementing its user-friendly remote temperature control.

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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