10 Best Electric On Demand Water Heater 2025 in the United States

The Stiebel Eltron Tempra 20 Plus Tankless Water Heater offers some impressive features that address key needs for an electric-on-demand-water-heater. It has a flow rate of up to 3.79 liters per minute, which should be sufficient for most households. The power rating of 19.2 kW ensures that it can deliver a significant temperature rise, keeping your showers hot even if demand fluctuates. The advanced flow control technology helps maintain a consistent water temperature, providing comfort and preventing interruptions during hot showers.

The Rheem 18kW 240V Tankless Electric Water Heater is a solid option for those looking to efficiently supply hot water on demand. With a flow rate of up to 4.4 gallons per minute (GPM), it can cater to smaller households or applications requiring moderate hot water supply, making it ideal for apartments or homes with limited space.

The Ranein Electric Tankless Water Heater is a compact and efficient choice if you want endless hot water without waiting for a tank to heat up. It uses 18 kW of power at 240 volts and can deliver up to 4.3 gallons of hot water per minute, which is enough for about 2 to 3 water outlets like showers or sinks around your home. Because it heats water only when you need it, it can save about 60% on heating costs compared to traditional tank water heaters. Its thermal efficiency is high, reaching 99%, so very little energy is wasted. The temperature can be easily adjusted with the LED display, from 86°F to 131°F, letting you set a comfortable level precisely. The unit is relatively small, measuring just under 14 by 19 inches, which means it won’t take up much space and can be wall-mounted in various places. For safety, it includes protections against leaks, overheating, and dampness, and has passed strict quality tests.