10 Best Tankless Water Heaters 2026 in the United States

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.

The Rheem RTG-95DVLN-3 is a natural gas tankless water heater designed for indoor use, offering a strong flow rate of 9.5 gallons per minute. This means it can supply enough hot water to run multiple fixtures at once—like a shower and dishwasher—making it suitable for medium to larger households. Its energy efficiency rating of 0.82 is decent for this type of non-condensing model, helping save on energy costs by only heating water on demand. The heater also includes a water-saving setting that claims to save up to 1,100 gallons annually, which is a nice bonus for reducing water waste.

Installation-wise, its compact wall-mounted design (about 13.5 by 24 inches) fits well indoors without requiring much space, but it needs natural gas hookups and venting, so professional installation is recommended. The unit can reach a maximum water temperature of 140°F, which covers typical household needs comfortably. Features like hot-start programming help avoid cold bursts of water by keeping the unit ready, improving user comfort. LeakGuard technology adds a layer of safety by detecting leaks early to prevent damage.

This model is non-condensing, so while it is efficient, it’s not as efficient as condensing units that recover more heat. With mostly positive user reviews averaging 4 out of 5 stars, the Rheem water heater offers a reliable, energy-conscious choice for those looking to upgrade from traditional tank heaters without the complexity of a condensing system.

The Rheem RTEX-11 is a compact electric tankless water heater designed to deliver continuous hot water on demand. With a flow rate of up to 2.68 gallons per minute (GPM), it works well for point-of-use applications like a single bathroom or kitchen sink but might struggle to supply multiple outlets simultaneously. Its self-modulating power control helps maintain consistent water temperature, and the easy-to-read digital LED display allows you to adjust settings precisely. Operating on 240 volts with 11kW of power, it is energy efficient with a 99.8% efficiency rating, which can help reduce electricity costs compared to traditional tank heaters.

The unit’s small size (about 8 by 13 inches) and wall-mounted design make it a good choice where space is limited. Installation is straightforward for those comfortable with electrical wiring, but it requires a 46-amp circuit breaker and proper 240V supply, so it might need a professional electrician. Maintenance is generally low since there are no tanks to flush, but users should keep an eye on sediment build-up in hard water areas.

Due to the relatively low maximum flow rate, this heater may not suit larger households needing hot water at multiple taps simultaneously. It is best suited for small homes, vacation cabins, or as a supplemental unit for isolated fixtures.