10 Best Tankless Rv Water Heaters 2025 in the United States

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.

The Ranein 65,000 BTU RV Tankless Water Heater is a strong choice for RV owners seeking on-demand hot water without the bulk of traditional tank heaters. Its flow rate of up to 3.9 gallons per minute means you can enjoy continuous hot water for showers and other uses without waiting for a tank to refill and heat. Running on propane gas (not electric), it’s designed to be energy efficient and includes a built-in pressure relief valve, which simplifies installation by removing the need for extra parts.

The unit weighs 27 pounds and measures roughly 15 by 15 inches, fitting easily into the common spaces left by older water heaters from brands like Suburban and Atwood, though you may need to buy a compatible door separately to complete the installation. Temperature control is user-friendly, ranging from 95°F to 124°F with staged combustion technology that adjusts the flame based on temperature needs to save propane, especially helpful when traveling. The multi-function remote controller gives you real-time info on gas usage, voltage, and flow rate, plus an anti-freeze feature activates automatically below 42.8°F to protect the unit in cold weather.

Safety is well-considered with features like an automatic gas shut-off if the flame goes out and a forced exhaust fan for stable combustion. The heater is CSA certified, ensuring it meets safety standards. This product suits RV travelers who want reliable, efficient hot water with modern controls and good safety features, particularly if replacing an older tank heater. It’s not electric-powered and might require some installation effort if you need to get a door or adapt fittings.

The GIRARD Tankless RV Water Heater stands out with its powerful performance, delivering 42,000 BTUs, which means you can always expect a steady supply of hot water in your RV. The 12V power operation and quiet, brushless motor ensure that it runs smoothly and quietly, which is great for a comfortable RV experience. Additionally, it is lightweight at 22 pounds and has compact dimensions (12.5"W x 12.5"H), making it a practical choice for the confined spaces of an RV.

The onboard microprocessor is a smart feature that helps regulate water temperature and flow, preventing fluctuations and ensuring safety from cold spots or scalding water. This product also boasts high energy efficiency, using only half the LP gas compared to traditional six-gallon tank water heaters, which can lead to significant savings over time. The digital user control panel adds convenience, allowing you to easily adjust temperature settings, switch between Fahrenheit and Celsius, and troubleshoot with error codes.

While the installation is designed to be straightforward, professional installation is strongly recommended, which might add to initial costs. Nonetheless, its freeze protection feature is a notable advantage for varying weather conditions. On the downside, it might be a bit more expensive upfront compared to traditional water heaters, and the requirement for professional installation could be a drawback for DIY enthusiasts. This tankless water heater is best suited for RV owners looking for a reliable, efficient, and high-performing solution for their hot water needs.