10 Best Tankless Hot Water Heaters 2026 in the United States

The Rheem RTGH-95DVLN-3 is a robust tankless water heater designed for residential indoor use with natural gas. Its standout feature is the impressive flow rate, ranging from 0.4 to 9.5 gallons per minute (GPM), making it suitable for larger households with higher hot water demands. The energy efficiency is also notable at 0.93, meaning it can help reduce energy bills compared to traditional water heaters.

The Rheem RTEX-24 Electric Tankless Water Heater is a solid choice for those seeking an efficient and high-capacity water heating solution. One of its major strengths is its impressive flow rate of up to 5.9 gallons per minute (GPM), which is suitable for serving multiple fixtures simultaneously. Additionally, its 99.8% energy efficiency rating makes it an economical option, as it minimizes energy waste and reduces utility bills.

The Rinnai RE199iN is a natural gas tankless water heater designed for indoor use, offering a strong flow rate of up to 9.8 gallons per minute (GPM). This means it can handle multiple fixtures at once, making it suitable for larger households or homes with higher hot water demand. It operates efficiently by heating water only when needed, which can help reduce energy waste compared to traditional tank heaters. The unit has a powerful 199,000 BTU output, supporting a good temperature rise for most household needs, with a maximum temperature of 140°F. Its compact size (about the size of a small suitcase) allows for easier installation on a wall, saving space in your home. However, professional installation is recommended due to the gas connection and complexity, which is common for gas-powered tankless heaters. The product includes a solid warranty: 15 years on the heat exchanger, 5 years on labor, and 1 year on parts, giving confidence in its durability.