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10 Best Commercial Tankless Electric Hot Water Heaters 2025 in the United States

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Our technology thoroughly searches through the online shopping world, reviewing hundreds of sites. We then process and analyze this information, updating in real-time to bring you the latest top-rated products. This way, you always get the best and most current options available.

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Our Top Picks

#1

Winner

Stiebel Eltron Tankless Water Heater - Tempra 36 Trend – Electric, On Demand Hot Water, Eco, White

Rating
10.0
Chosen by1,445
Flow Rate
Temperature Rise
Energy Efficiency

Most important from
2099 reviews

Flow Rate
Continuous flow of hot water even with multiple showers running simultaneously.
Temperature Rise
Precise temperature control ensures you get the desired hot water without any fuss.
Energy Efficiency
The unit's performance has exceeded expectations in terms of convenience and efficiency.
Installation Requirements
Can be installed anywhere, eliminating the need for a flue and allowing hot water to be available quickly where needed.
Durability and Warranty
Despite the higher price, the robust German construction and performance make it worth the investment.

The Stiebel Eltron Tempra 36 Trend is a solid choice for those seeking a reliable commercial tankless electric hot water heater. With a flow rate of 0.77 gallons per minute and a power rating of 36 kW, it delivers an impressive temperature rise, making it suitable for larger households or small commercial settings that require consistent hot water. One of its standout features is the continuous flow capability, ensuring that hot water is available on demand, which is particularly beneficial for busy environments.

Energy efficiency is another strength of this model. The auto-modulation feature helps conserve energy by adjusting the power output based on demand, leading to savings on utility bills. Additionally, the compact design requires no venting, making installation easier and saving space in tight locations.

However, there are some considerations to keep in mind. The Tempra 36 Trend requires a substantial electric service of at least 300 A, which might not be suitable for all homes or businesses without substantial electrical infrastructure. The installation might also necessitate a professional, adding to the overall cost. Furthermore, while it operates silently, some users may find the maximum flow rate slightly limiting if multiple hot water outlets are being used simultaneously. Durability is addressed with a solid warranty: a 7-year leak warranty and a 3-year parts warranty, which suggests confidence in the product's longevity.

Rating
10.0
Chosen by1,445
Flow Rate
Temperature Rise
Energy Efficiency

Most important from
2099 reviews

Flow Rate
Continuous flow of hot water even with multiple showers running simultaneously.
Temperature Rise
Precise temperature control ensures you get the desired hot water without any fuss.
Energy Efficiency
The unit's performance has exceeded expectations in terms of convenience and efficiency.
Installation Requirements
Can be installed anywhere, eliminating the need for a flue and allowing hot water to be available quickly where needed.
Durability and Warranty
Despite the higher price, the robust German construction and performance make it worth the investment.
#2

Stiebel Eltron 239223 Tankless Water Heater – Tempra 29 Plus – Electric, On Demand Hot Water, Eco, White, 23

Rating
10.0
Flow Rate
Power Rating
Temperature Rise

Most important from
2099 reviews

Flow Rate
It provides a continuous flow of hot water, even when running two showers simultaneously for an extended period.
Power Rating
Absolutely no power usage when not in use, allowing instant hot water upon return.
Temperature Rise
Temperature control is precise, ensuring the desired hot water without any fuss.
Energy Efficiency
The unit's performance has exceeded expectations in terms of convenience and efficiency.
Installation Requirements
The installation took about four hours, including the addition of a whole-home water filtration system on the main line.
Durability and Warranty
The unit has been flawless and just works as expected.

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.

Rating
10.0
Flow Rate
Power Rating
Temperature Rise

Most important from
2099 reviews

Flow Rate
It provides a continuous flow of hot water, even when running two showers simultaneously for an extended period.
Power Rating
Absolutely no power usage when not in use, allowing instant hot water upon return.
Temperature Rise
Temperature control is precise, ensuring the desired hot water without any fuss.
Energy Efficiency
The unit's performance has exceeded expectations in terms of convenience and efficiency.
Installation Requirements
The installation took about four hours, including the addition of a whole-home water filtration system on the main line.
Durability and Warranty
The unit has been flawless and just works as expected.
#3

Rheem 18kW 240V Tankless Electric Water Heater, Gray

Rating
9.9
Power Rating
Temperature Rise
Installation Requirements

Most important from
1980 reviews

Power Rating
Cheaper than Home Depot, pulls about 8kW upon use.
Temperature Rise
No need to set the temperature to 145°F unless using multiple hot water devices simultaneously.
Installation Requirements
Installed in a tiny house and works wonderfully.

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.

Rating
9.9
Power Rating
Temperature Rise
Installation Requirements

Most important from
1980 reviews

Power Rating
Cheaper than Home Depot, pulls about 8kW upon use.
Temperature Rise
No need to set the temperature to 145°F unless using multiple hot water devices simultaneously.
Installation Requirements
Installed in a tiny house and works wonderfully.

Buying Guide for the Best Commercial Tankless Electric Hot Water Heaters

Choosing the right commercial tankless electric hot water heater can be a bit overwhelming, but with the right approach, you can find the perfect fit for your needs. The key is to understand the specific features and specifications that matter most for your application. By focusing on these key specs, you can ensure that you select a model that provides reliable, efficient, and sufficient hot water for your commercial space.
Flow RateFlow rate, measured in gallons per minute (GPM), indicates how much hot water the heater can deliver at a time. This is crucial because it determines whether the heater can meet the demand of your commercial space. For small businesses with low hot water needs, a lower flow rate (around 3-5 GPM) may suffice. For larger operations like restaurants or hotels, a higher flow rate (10+ GPM) is necessary to ensure multiple fixtures can operate simultaneously without a drop in water temperature. Assess your peak hot water usage to determine the appropriate flow rate for your needs.
Power RatingThe power rating, measured in kilowatts (kW), indicates the heating capacity of the unit. Higher power ratings mean the heater can heat water more quickly and handle higher flow rates. For light commercial use, a unit with a power rating of 10-20 kW might be adequate. For heavy-duty applications, you might need a unit with 20-30 kW or more. Consider the volume of hot water required and the speed at which it needs to be heated to choose the right power rating.
Temperature RiseTemperature rise refers to the increase in water temperature as it passes through the heater. This is important because it affects how hot the water will be when it reaches the tap. A higher temperature rise is needed in colder climates where incoming water temperature is lower. For example, if the incoming water is 50°F and you need it to be 120°F, the heater must provide a 70°F temperature rise. Ensure the unit you choose can achieve the necessary temperature rise for your location and usage.
Energy EfficiencyEnergy efficiency, often expressed as a percentage, indicates how well the heater converts electrical energy into hot water. Higher efficiency means lower operating costs and less energy waste. Look for units with efficiency ratings of 90% or higher for the best performance. Consider the long-term savings on energy bills when choosing a more efficient model, especially if your commercial space has high hot water usage.
Installation RequirementsInstallation requirements include the electrical specifications and space needed for the unit. Commercial tankless electric water heaters often require significant electrical capacity, so ensure your building's electrical system can support the unit. Additionally, consider the physical space where the heater will be installed. Some units are compact and can fit in tight spaces, while others may require more room. Check the installation guidelines and consult with a professional if necessary to ensure compatibility with your building.
Durability and WarrantyDurability and warranty are indicators of the unit's reliability and the manufacturer's confidence in their product. Look for heaters made with high-quality materials that can withstand the demands of commercial use. A longer warranty period (5-10 years) provides peace of mind and protection against potential issues. Consider the reputation of the manufacturer and read reviews to gauge the durability and reliability of the unit.

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