10 Best Rv Tankless Water Heaters 2025 in the United States

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.

The GIRARD Tankless RV Water Heater is designed to deliver consistent hot water for RV users. With a powerful output of 42,000 BTUs, it efficiently maintains a steady water flow and temperature, which is a significant strength for those relying on hot water during their travels. The onboard microprocessor helps to regulate the water temperature, preventing both cold spots and scalding, which enhances safety—a crucial aspect for any water heating system.

It operates quietly on 12V power, consuming much less energy compared to traditional tank water heaters. This feature not only saves on fuel but also makes it an eco-friendlier choice for RV enthusiasts looking to minimize their environmental impact. The digital control panel is user-friendly, allowing easy adjustments to temperature settings and providing continuous feedback on water temperature, which is great for monitoring and troubleshooting.

Potential buyers should note that professional installation is strongly recommended. While the unit is designed for easy installation, the complexity may be daunting for those who are not particularly handy. The product's lightweight design (22 pounds) is a plus for easy handling, but it's worth considering the installation space in your RV, as it has specific dimensions that need to be accommodated. The GIRARD Tankless RV Water Heater stands out for its efficiency and consistent performance, making it a solid choice for many RV users, especially those keen on minimizing their fuel consumption. Just be prepared for professional installation and consider your specific hot water needs.

The FOGATTI InstaShower 8 Plus is a solid choice for RV owners who want a reliable tankless water heater that provides continuous hot water without waiting. It delivers up to 2.9 gallons per minute, which is enough for comfortable showers for multiple people without running out like traditional tank heaters. It runs on 12V DC propane, ensuring you won’t lose hot water power even off-grid, which is great for RV travel, especially at high altitudes thanks to its special combustion technology.

The unit is moderately sized (15 x 15 inches) and weighs about 31 pounds, designed to fit most RV water heater openings, making replacement straightforward for many popular brands. Temperature is well controlled to avoid overheating and conserve propane, with an easy-to-use remote controller included. Safety is strong with features like automatic gas shutoff, anti-freeze protection, and a built-in pressure relief valve, giving extra peace of mind.

Installation may require retrofitting if upgrading from larger tank heaters, and while the 2.9 GPM flow rate suits typical RV needs, it might feel limited for larger groups or simultaneous multiple uses. Maintenance is simplified by built-in protections and the fan-assisted combustion system, but professional help might still be needed for initial installation or servicing. If you want consistent hot water with energy-efficient propane use and safety features suitable for high elevation camping, this model offers good value and performance.