Top-10 Electric On Demand Water Heater
Loved in the USA

The Rheem RTEX-24 Electric Tankless Water Heater is a solid choice for those looking for on-demand hot water. With a power output of 24kW and a flow rate of up to 5.9 gallons per minute (GPM), it offers consistent and continuous hot water supply, making it suitable for medium to large households.

The adjustable digital temperature display and self-modulating power control add convenience and efficiency, allowing users to customize their water temperature easily. Its 99.8% energy efficiency rating means it is environmentally friendly and could help in lowering energy bills over time.

The LED display is an added feature that enhances user experience by providing clear temperature readings. Installation is straightforward, thanks to the wall mount design and 3/4

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.

Energy efficiency is a strong point as well; the unit has auto-modulation and electronic flow control, and a savings monitor helps track energy costs, making it eco-friendly and potentially cost-effective in the long run. It's compact and wall-mountable, saving space without the need for venting, which can be a big advantage for smaller homes or apartments. The installation requires a minimum 125 A electric service, which might necessitate an upgrade for some homes. The digital temperature display and preset buttons make operation straightforward, and the unit runs quietly.

The warranty is robust, offering 7 years against leakage and 3 years for parts, which provides some peace of mind. However, the maximum flow rate of 3.79 liters per minute may not suffice for larger households with multiple simultaneous hot water demands. Additionally, while it is energy-efficient, the initial cost and potential need for electrical upgrades might be a consideration for some users. This unit is best suited for average-sized homes that require a reliable and efficient solution for on-demand hot water.

The Rheem 11kW 240V Tankless Electric Water Heater is a compact and energy-efficient choice for providing continuous hot water on demand. With a flow rate of up to 2.68 gallons per minute, it suits small households or point-of-use applications such as a single bathroom or kitchen sink, but might struggle to supply multiple fixtures simultaneously in larger homes. It delivers a temperature rise sufficient for moderate hot water needs, controlled easily through an on/off dial and adjustable digital temperature display. The self-modulating power control helps maintain energy efficiency at around 99.8%, which means it heats water without wasting much electricity.

Sized at just over 8 by 12 inches and weighing about 7 pounds, it’s easy to mount on a wall and fits well in tight spaces. Installation requires 240 volts and 46 amps, so you’ll want to ensure your electrical system can support this load. Side water connections are standard 1/2-inch NPT fittings, which are common and straightforward for plumbing hookups. Some users appreciate the LED display for clear temperature settings, though this model is best suited for limited hot water demand due to its flow capacity.

This heater represents a reliable, energy-saving option for small-scale or point-of-use heating needs. If you need to supply hot water for multiple bathrooms or high-flow appliances, you might want to consider a higher-capacity unit.