10 Best Tankless Water Heaters 2026 in the United States

The Fogatti InstaShower 8 Plus is designed specifically for RV users and campers looking for a reliable, propane-powered tankless water heater. It delivers up to 2.9 gallons per minute, which is quite good for RV use, allowing multiple showers without running out of hot water quickly. The unit is energy efficient with 55,000 BTUs and runs on propane, so you don’t have to worry about electrical hookups while traveling. It’s also high-altitude ready, working effectively up to 9,800 feet, which is a useful feature if you camp in mountainous areas.

Installation is flexible with three door size options to retrofit existing water heater openings, making it a practical choice for replacing older tank or tankless models from popular brands. The water heater includes helpful safety features like automatic gas shut-off and frost protection, plus it has a built-in pressure relief valve and remote controller for ease of use. Its maximum temperature is limited to 123°F, which might be lower than some users prefer, and while the flow rate is solid for RV needs, it may not meet the demands of larger households or full-time RVers requiring higher water volumes.

The unit’s size at 15”x15” is compact but may require door modification for larger replacements. Maintenance is simplified by built-in protections; however, as a propane device, it requires regular checks for safe operation. This heater is well-suited for families and campers who want continuous hot water without the wait of tank heaters, offering easy installation and strong safety features tailored to RV lifestyles.

The Orbek RV Tankless Water Heater is a solid choice for RV families and campers seeking reliable hot water on demand. Running on propane with a powerful 60,000 BTU output, it offers a flow rate of 3.5 gallons per minute, which should be enough for typical RV tasks like showers and dishwashing without waiting for water to heat up. Its temperature range (95°F to 123°F) is adjustable via a convenient remote control, making it easy to get comfortable water temperatures. The heater’s design is compact (about 13" x 13") and mounts on the RV wall, fitting common installation spaces.

It’s compatible with 12V DC power systems found in most RVs and includes useful safety features like frost protection and automatic gas shutoff, which help ensure reliable operation in various conditions, including high altitudes up to nearly 10,000 feet. Maintenance is simplified by using a copper heat exchanger and no need for anode rod replacements, plus a built-in pressure-reducing valve reduces extra parts or trips to hardware stores. Installation is designed to be DIY-friendly, though some users might prefer professional help.

The unit weighs about 20.5 pounds, making it manageable to handle during installation. With a 2-year warranty and 24/7 customer support, this heater represents a dependable upgrade or replacement for RV users who want efficient, endless hot water with an emphasis on energy savings and safety. For those who require higher flow rates or electric heating, this model might be less suitable. Additionally, it is not electric powered and lacks smart home integration, which may matter less for RV use but could be a drawback if you want remote app control.

The Rheem RTEX-24 24kW 240V Electric Tankless Water Heater offers a robust solution for continuous hot water supply with its impressive flow rate of up to 5.9 gallons per minute, making it suitable for households with moderate to high hot water demands. One of its standout features is the 99.8% energy efficiency, which helps in reducing energy costs and promoting eco-friendliness. The electric fuel type simplifies installation and maintenance compared to gas models, although it does require a 240V electrical connection, which some homes may need to upgrade to accommodate.

The compact dimensions (17.63”W x 18.25”H x 3.5”D) and wall-mount design make it space-efficient and ideal for small utility areas, while the digital temperature display and ON/OFF dial control provide ease of use and precise temperature adjustments. Additionally, the self-modulating power control enhances efficiency by only using the necessary amount of power based on the water flow rate.

However, the temperature rise might be limited during peak usage in colder climates, potentially requiring additional units for larger homes. Potential buyers should consider the installation requirements and whether their household electrical setup can support the unit. Those looking for a reliable, energy-efficient, and continuous hot water supply will find the Rheem RTEX-24 a compelling option, especially in moderate climates and homes with appropriate electrical infrastructure.