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.

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The Stiebel Eltron Tempra 24 Plus is a well-regarded tankless electric water heater suitable for both residential and commercial use. One of its standout features is its advanced Flow Control technology, which ensures a consistent water temperature, even when demand fluctuates. This is excellent for preventing interruptions during long showers or multiple simultaneous hot water usages.

In terms of design, the Tempra 24 Plus is compact and energy-efficient, making it ideal for those looking to save space while also reducing energy costs. Its sleek, white casing is attractive and it requires no venting, simplifying installation. The heater also has a digital display for easy temperature management, allowing users to set their desired hot water temperature with preset options.

Potential buyers should be mindful of the installation requirements, as it needs a minimum electric service of 150 A, which might necessitate an electrical upgrade in some homes or businesses. Additionally, while it performs efficiently, there might be limitations in flow rate during high-demand situations, as it can reduce water flow to maintain temperature. This could be a concern for larger households or commercial settings where multiple outlets are used simultaneously. Durability is supported by a respectable warranty period, offering 7 years for leakage and 3 years for parts, giving peace of mind regarding long-term reliability. The Stiebel Eltron Tempra 24 Plus is an excellent choice for those needing a reliable and efficient hot water solution, particularly in spaces where energy conservation is a priority. Just ensure that your electrical system can support its requirements to fully enjoy its benefits.

The Stiebel Eltron Tempra 29 Plus is a powerful tankless electric water heater designed to supply continuous and unlimited hot water on demand. Its sleek design saves space and eliminates the need for venting, making it an excellent choice for commercial settings. With a flow rate of up to 3 gallons per minute, this heater can efficiently meet high hot water demands. The LED display and two temperature memory presets add convenience, allowing users to easily adjust settings to their preference.

Additionally, its eco-friendly design promotes energy efficiency, a significant benefit for commercial operations mindful of energy costs and environmental impact. However, the unit requires a substantial power supply, needing hard-wired 240 or 208-volt service, three separate 40 amp breakers, and a minimum 200 amp total service to the residence. This could be a challenge for locations without an existing robust electrical infrastructure. Moreover, its installation requires professional expertise due to these electrical requirements.

The durability is emphasized by its robust build quality and certification standards (CSA, NSF, UL, ANSI). The Tempra 29 Plus does not require ongoing battery replacements, reducing long-term maintenance efforts. Despite its higher upfront cost, its efficiency and low maintenance needs make it a potentially cost-effective option in the long run. Ideal for commercial enterprises needing reliable and steady hot water supply, it balances performance, efficiency, and user-friendly features well.