10 Best Rv Tankless Water Heaters 2026 in the United States

The FOGATTI InstaShower Ultra is a powerful tankless water heater designed specifically for RV users who want reliable hot water on the go. With a strong heat output of 66,000 BTU, it can deliver hot water at up to 3.6 gallons per minute, enough to use the shower and kitchen faucet simultaneously without running out of hot water. This makes it a great choice for daily RV use or for families who need consistent water flow. It uses a 12-volt energy source and has an eco-friendly low flow startup that conserves energy when water demand is low. The unit is fairly compact, measuring 15 by 15 inches and weighing around 34 pounds, fitting well in most RVs but possibly requiring professional help to install. Temperature control is impressive, with precise adjustment within 1 degree Fahrenheit and a built-in mixing tank to prevent sudden hot or cold bursts, ensuring comfortable and stable water temperature regardless of outside weather.

Safety features include flame failure protection, oxygen depletion shut-off, overheat and anti-freezing protections, along with a built-in pressure relief valve to prevent issues without needing extra parts. Another convenience is the included remote controller, which allows adjusting settings from up to 6.6 feet away. The unit’s weight and the need for proper venting and installation might pose challenges for some RV owners who prefer plug-and-play solutions. Designed for high altitudes and tough weather, it still requires regular maintenance to keep running smoothly. The InstaShower Ultra is a strong, efficient, and safe tankless water heater ideal for RVers seeking a dependable and energy-conscious hot water system and who are comfortable with a slightly more involved installation.

The Fogatti RV Tankless Water Heater is a strong choice for RV owners seeking a reliable, on-demand hot water supply. It delivers a high flow rate of 3.6 gallons per minute, enough for simultaneous use in the bathroom and kitchen, which means no waiting around for hot water. Its 66,000 BTU burner adapts to seasonal needs, helping maintain comfortable temperatures without overheating. The built-in mixing tank stabilizes temperature swings, offering precise control within 1 degree Fahrenheit, so showers stay consistent and comfortable.

Sized at 15 by 15 inches and weighing about 31 pounds, it’s compact enough to fit common RV heater openings, making replacement or upgrades easier. It runs on propane with a 12-volt control system, so it doesn’t rely on electricity for heating but uses minimal power for operations, important for RV setups. Installation is simplified by including a pressure relief valve and a remote controller that works up to 6.6 feet away, adding convenience. Fogatti also included multiple safety features like anti-freeze protection, flame failure shutoff, overheat protection, and a dust filter, which helps reliability in varied conditions, including high altitudes and windy environments.

One drawback is its size may require specific door openings for larger tank replacements, so some retrofitting might be necessary. Also, while it’s powerful and efficient, users new to tankless systems might need to familiarize themselves with its controls and maintenance needs, like checking the filter regularly. This model suits RVers looking for efficient, instant hot water with solid safety features and flexible installation options, though a bit of setup know-how will help get the most from it.

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.