10 Best Commercial Tankless Electric Hot Water Heaters 2026 in the United States

The Rheem RTEX-24 is a 24kW, 240V electric tankless water heater designed for commercial use. Its standout feature is the ability to deliver a high flow rate of up to 5.9 gallons per minute (GPM), which means it can supply hot water to multiple fixtures simultaneously, a beneficial trait for commercial settings.

Its self-modulating power control ensures efficient energy usage, achieving an impressive 99.8% energy efficiency, making it a cost-effective choice for businesses looking to reduce energy bills. The adjustable digital temperature display and ON/OFF dial control make it user-friendly, allowing precise temperature adjustments.

Installation is simplified with bottom 3/4

The Rheem 18kW 240V Tankless Electric Water Heater is a strong contender in the commercial tankless electric water heater category. With a flow rate of up to 4.4 gallons per minute (GPM), it can efficiently supply hot water for various applications, making it ideal for small businesses or residential settings where space-saving is crucial. The unit features advanced self-modulation technology that adjusts power usage based on hot water demand, improving energy efficiency, which is rated at an impressive 99.8%. This could lead to significant savings on energy bills, particularly in environments with fluctuating hot water needs.

Installation is straightforward, with bottom 3/4 inch NPT water connections and a wall-mount design that is simple to set up. The external digital thermostatic control with LED display allows for precise temperature adjustments, catering to specific user preferences with accuracy to +/-1 degree. The durable copper immersion heating elements further enhance the product's longevity, and being field serviceable means maintenance can be done without needing to replace the entire unit.

There are some considerations to keep in mind. While the flow rate is suitable for residential or light commercial use, larger businesses with higher hot water demands might find this unit insufficient. The weight of 14.78 pounds is relatively light for its size, but some users might still prefer a more robust model depending on their specific needs.

The Rheem 11kW 240V Tankless Electric Water Heater is a solid choice for those needing a reliable source of hot water on demand. Its main strength lies in its ability to provide continuous hot water with a flow rate of up to 2.68 gallons per minute (GPM). This makes it suitable for smaller commercial settings or households with moderate hot water needs. The adjustable digital temperature display and self-modulating power control are user-friendly features that help maintain consistent water temperature and energy efficiency.

The unit is relatively compact, with dimensions of 8.25 inches wide by 12.63 inches high, and it is wall-mountable, which can save valuable space. Durability seems promising with a solid construction and a stainless steel finish. Some potential drawbacks include the power rating of 11 kW, which may not be sufficient for larger commercial applications or areas with higher hot water demands. Additionally, installation requirements might require professional help, particularly for those unfamiliar with electrical setups.

This Rheem tankless water heater is an efficient and compact option for consistent hot water supply in smaller commercial or residential settings, but it may not be ideal for larger, high-demand environments.