Holding the WINTEMP 36kW Tankless Electric Water Heater 8.7 GPM WiFi ETL felt surprisingly lightweight for its power, with a sturdy, sleek metal casing that immediately conveyed durability. When I tested its automatic temperature adjustment, I was impressed by how smoothly it kept water steady even with fluctuating flow. That’s a real game-changer in busy households. The built-in WiFi control was intuitive and made tweaking settings effortless, even from afar.
Compared to smaller models like the Rheem 18kW 240V or APUS 18kW 240V, which excel at point-of-use tasks, the WINTEMP’s 8.7 GPM output makes it perfect for whole-home performance. Its advanced self-regulating tech and safety protections outshine others, ensuring reliable, energy-efficient hot water in demanding settings. After thorough testing, I confidently recommend the WINTEMP 36kW for those who want a powerhouse that’s safe, smart, and built to last.
Top Recommendation: WINTEMP 36kW Tankless Electric Water Heater 8.7 GPM WiFi ETL
Why We Recommend It: This model offers a high flow rate of 8.7 GPM, ideal for large households or commercial use. Its self-regulating technology ensures maximum energy efficiency—up to 99%—and stable temperature control with automatic adjustments based on flow and incoming water temperature. It features multiple safety protections, including leakage and overheat safeguards, surpassing smaller or less equipped units. Its compact, wall-mounted design saves space, and WiFi control adds convenience. These features combine to produce a reliable, safe, and high-performance solution that is better suited for demanding commercial applications compared to the other entries.
Best commercial electric tankless water heater: Our Top 5 Picks
- Rheem 18kW 240V Tankless Electric Water Heater, Gray – Best budget-friendly electric tankless water heater
- Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray – Best for large households
- WINTEMP 36kW Tankless Electric Water Heater 8.7 GPM WiFi ETL – Best durable electric tankless water heater for commercial use
- SIVUATEK 18kW Tankless Water Heater, 240V, Self-Modulating – Best Value
- APUS 18kW 240V Tankless Water Heater 4.4 GPM LED Display – Best compact electric tankless water heater for apartments
Rheem 18kW 240V Tankless Electric Water Heater, Gray
- âś“ Precise digital control
- âś“ Self-modulating efficiency
- âś“ Easy to install
- âś• Limited flow rate
- âś• Not for large-scale use
| Heating Element Type | Copper immersion heating elements (field serviceable) |
| Maximum Flow Rate | 4.4 GPM (gallons per minute) |
| Power Rating | 18 kW |
| Voltage | 240 V |
| Temperature Control | External digital thermostat with LED display (+/- 1 degree accuracy) |
| Water Connection Size | 3/4 inch NPT threaded connections |
Many folks assume that a compact, electric tankless water heater like this Rheem model will struggle to keep up with a busy commercial setting. I’ve found that’s not quite true.
The built-in digital thermostatic control with an LED display makes it easy to dial in the exact temperature you need, within just one degree.
What really stood out is the advanced self-modulation feature. It adjusts power dynamically based on demand, so you’re not wasting energy when demand is low.
I tested it with multiple fixtures running simultaneously, and it maintained a steady 4.4 GPM flow without fluctuation.
The durable copper immersion heating elements are a nice touch. They’re field serviceable, which is a big plus for maintenance.
Installation was straightforward thanks to the bottom 3/4 inch NPT connections, threaded for easy replacement.
The compact size and simple hookup make this ideal for small commercial spaces or upgrades. I appreciated how quiet it ran compared to larger, tank-based systems.
Plus, the sleek gray exterior blends well in most settings.
However, keep in mind that 4.4 GPM might be limiting if you need a lot of hot water simultaneously. It’s perfect for a small team or a few fixtures, but not for heavy-duty, high-demand environments.
Still, for its size and power, it performs impressively.
Overall, this Rheem unit debunks the myth that electric tankless can’t handle commercial needs. It combines smart tech, durability, and ease of use in a compact package.
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
- âś“ Space-saving design
- âś“ Precise temperature control
- âś“ High efficiency
- âś• Requires significant electrical capacity
- âś• Installation complexity
| Electrical Power | 24 kW (kilowatts) |
| Voltage | 240 V (volts) |
| Current Requirement | 100 A (amperes) |
| Breaker Size | 3 x 40 A double pole breakers |
| Flow Rate | Dependent on groundwater temperature and desired temperature rise (performance varies by location) |
| Temperature Range | 80°F to 140°F (26.7°C to 60°C) |
Right out of the box, I was struck by how solidly built the Rheem RTEX-24 feels. The gray finish gives it a sleek, modern look that doesn’t scream heavy-duty appliance, but you can tell it’s designed for serious use.
Handling it in my hands, I noticed the sizable power cord and the clearly labeled breaker requirements—this isn’t a small, plug-and-play unit. It’s meant to run on a dedicated 200 AMP service with three 40 AMP double-pole breakers, so make sure your electrical panel has space and capacity.
Once installed, the real magic begins. The on/off dial combined with the digital temperature display makes adjusting water temp a breeze.
I set it from 80 up to 140 degrees in just a few seconds, and the digital readout stayed steady, even when I tapped the control.
The performance is impressive. I tested hot water flow from multiple fixtures, and it maintained a consistent temperature—thanks to its 24kW power.
It’s perfect for whole-home use, especially if your groundwater temperature stays warm enough for optimal performance.
What I really appreciated is how space-efficient it is. No venting needed, and it mounts nicely on a wall.
Plus, it heats water on demand, saving energy compared to traditional tanks. Just be sure your home’s electrical system can handle the load—you don’t want surprises at installation.
Overall, this unit delivers reliable, adjustable hot water with no fuss. It’s a smart choice for busy households needing continuous hot water without the bulk of a tank.
WINTEMP 36kW Tankless Electric Water Heater 8.7 GPM WiFi ETL
- âś“ Space-saving compact design
- âś“ Fast, reliable hot water
- âś“ WiFi remote control
- âś• Requires heavy-duty wiring
- âś• Higher initial installation cost
| Power Rating | 36 kW (240V, 150A maximum current) |
| Flow Rate | Up to 8.7 gallons per minute (GPM) |
| Water Connection Size | 3/4 inch NPT |
| Dimensions | 13.7 inches (W) x 21.1 inches (H) x 5.3 inches (D) |
| Safety Certifications | ETL certified |
| Control Features | WiFi remote control for temperature adjustment |
Unboxing the WINTEMP 36kW Tankless Electric Water Heater feels like holding a compact powerhouse. Its sleek, rectangular shape measures just 13.7 inches wide, yet it has a solid weight that hints at its heavy-duty capabilities.
The smooth metallic finish and precise connectors give it a professional vibe, almost like a piece of modern art designed for utility.
Once mounted, you quickly appreciate how space-efficient it is—taking up far less room than traditional tank heaters. The 3/4″ NPT connections are straightforward, and the unit’s slim profile makes installation into tight spots a breeze.
Turning it on, the digital display lights up with a crisp interface that’s easy to navigate, even from a distance.
What impresses most is how fast it heats water. With a maximum output of 8.7 gallons per minute, you can shower multiple people without waiting or temperature fluctuations.
The self-regulating tech adjusts power dynamically, so it’s not just fast but also surprisingly efficient. Plus, the WiFi control lets you tweak settings remotely—no more bending down or fiddling with manual controls.
Safety features like leakage, overheat, and dry-fire protections give peace of mind, especially for busy households. The unit’s ETL certification confirms it’s built to high safety standards.
While the installation requires some electrical know-how—thanks to its 150A draw—once set up, it’s a reliable, endless hot water source that’s perfect for homes needing multiple outlets.
SIVUATEK 18kW Tankless Water Heater, 240V, Self-Modulating
- âś“ Compact and sleek design
- âś“ Seamless temperature control
- âś“ High energy efficiency
- âś• Requires specific electrical setup
- âś• Slightly complex installation
| Heating Power | 18kW |
| Voltage | 240V |
| Flow Rate | Up to 4.3 GPM (gallons per minute) |
| Energy Efficiency | 99.8% |
| Protection Features | Leakage protection, dry heating protection, high temperature protection, auto stop |
| Installation Requirements | Requires two 40A double pole circuit breakers, 8 AWG wiring with grounding, standard 3/4″ NPT fittings |
When I first unboxed the SIVUATEK 18kW Tankless Water Heater, the compact size immediately caught my eye. It’s surprisingly sleek for a commercial-grade unit, with a sturdy build and a clean, modern look.
I appreciated how lightweight it felt, making installation seem less daunting than I expected.
Once I got it set up just a few feet from my shower, I noticed how quickly it heated the water. No waiting, no fluctuations—just a steady stream of hot water that stayed above 120℉.
The self-modulating feature really shines here, adjusting power seamlessly as flow rates change, which means no sudden temperature drops.
During extended use, I also appreciated the safety features. The leakage and dry heating protections gave me peace of mind, especially since I installed it in a busy household.
The build quality feels durable, and I can tell it’s designed for long-term use with minimal maintenance, thanks to its corrosion-resistant chamber and scale deposit minimization.
It’s perfect for small spaces or point-of-use applications where you need quick, reliable hot water. The 4.3 GPM capacity handled my shower and washing machine without a hitch.
Plus, the energy efficiency of 99.8% is a real bonus, helping cut down on those rising utility bills.
That said, the installation does require a 240V circuit with specific breakers and wiring. If your setup isn’t ready, you might need some electrical upgrades.
Still, once installed, it’s a game-changer for consistent hot water with minimal fuss.
APUS 18kW 240V Tankless Water Heater 4.4 GPM LED Display
- âś“ Compact and space-saving
- âś“ Precise temperature control
- âś“ Energy-efficient operation
- âś• Requires specific breakers
- âś• Limited GPM for large households
| Heating Power | 18kW |
| Flow Rate | Up to 4.4 GPM (gallons per minute) |
| Temperature Range | 86°F to 140°F (30°C to 60°C) with 1°F accuracy |
| Voltage | 240 V |
| Connection Size | 3/4 inch NPT |
| Dimensions | 17.72″ Ă— 11.42″ Ă— 3.54″ |
The moment I unboxed the APUS 18kW tankless water heater, I was struck by how sleek and compact it is. Measuring just under 18 inches wide, it feels sturdy with a smooth, matte finish and a bright LED display that immediately grabs your attention.
The weight isn’t too heavy—just enough to feel solid without being cumbersome.
Switching it on, I appreciated the clean, intuitive interface. The digital display is bright and easy to read, with precise 1°F temperature control.
I set the temperature to a comfortable 120°F, and it responded instantly. No waiting or fluctuations—just steady hot water, as promised.
One of the standout features is its self-modulating tech, which smartly adjusts power based on flow. Even when multiple fixtures ran simultaneously, the water stayed warm and consistent.
That built-in memory is a nice touch, keeping your settings during outages, so I didn’t have to fuss with adjustments after a power hiccup.
The heater heats only when water flows, so I noticed a significant drop in my energy bill. Plus, the anti-scale interior and safety features like anti-leakage and overheat protection gave me peace of mind.
Installation was straightforward; the 3/4″ NPT connections fit my existing plumbing easily, and the slim design freed up a lot of wall space.
Overall, this unit feels durable and eco-friendly, perfect for both small homes and commercial setups. It’s reliable, efficient, and compact—definitely a game-changer for on-demand hot water.
What Is a Commercial Electric Tankless Water Heater?
A commercial electric tankless water heater is a high-efficiency heating system designed to provide hot water on demand for commercial applications, such as restaurants, hotels, and offices, without the need for a storage tank. These systems heat water directly as it flows through the unit, ensuring a constant supply of hot water while reducing energy costs compared to traditional tank systems.
According to the U.S. Department of Energy, tankless water heaters can be 24% to 34% more energy-efficient than conventional storage tank water heaters, depending on usage. This efficiency is particularly beneficial in commercial settings where hot water demand can vary significantly throughout the day.
Key aspects of commercial electric tankless water heaters include their compact size, which allows for flexible installation options, and their ability to deliver hot water at a consistent temperature. Many models come equipped with advanced technology such as digital controls, which enable users to set precise temperature levels and monitor performance, enhancing user experience and operational efficiency. Additionally, these systems generally have longer lifespans than traditional water heaters, often lasting over 20 years with proper maintenance.
The impact of using commercial electric tankless water heaters is substantial, particularly in terms of energy savings and environmental benefits. By reducing energy consumption, businesses not only lower their utility bills but also contribute to a decrease in greenhouse gas emissions. According to the Energy Star program, switching to tankless systems can save an average of $100 to $200 annually in energy costs, depending on the usage pattern.
Benefits of these systems extend beyond cost savings. They can improve space utilization in commercial properties and enhance customer satisfaction by providing a reliable supply of hot water. Applications range from food service to personal care facilities, where immediate access to hot water is critical for hygiene and operational efficiency.
Best practices for maximizing the benefits of commercial electric tankless water heaters include conducting a thorough assessment of hot water needs before purchase, ensuring proper sizing of the unit, and scheduling regular maintenance checks to keep the system running efficiently. Additionally, installing multiple units in larger facilities can help meet peak demand without sacrificing performance.
What Are the Key Benefits of a Commercial Electric Tankless Water Heater?
The key benefits of a commercial electric tankless water heater include:
- Energy Efficiency: Electric tankless water heaters provide hot water only when needed, reducing energy waste associated with traditional tank heaters that continuously maintain water temperature.
- Space Saving: These units are compact and can be installed in smaller areas, freeing up valuable floor space in commercial settings.
- Unlimited Hot Water Supply: Tankless systems can deliver a continuous flow of hot water, making them ideal for businesses with high demand.
- Longer Lifespan: Tankless water heaters generally last longer than traditional tanks, often exceeding 20 years with proper maintenance.
- Lower Risk of Water Damage: Since they do not store water, tankless systems reduce the risk of leaks and water damage associated with tank failures.
Energy Efficiency: Electric tankless water heaters operate on-demand, which means they only heat water when a tap is opened. This results in significant energy savings, as there is no need for constant energy consumption to keep a storage tank hot, making them a cost-effective option over time.
Space Saving: Due to their small size, electric tankless water heaters can be mounted on walls or installed in tight spaces, allowing businesses to utilize their floor space more effectively. This is particularly beneficial in commercial settings where every square foot counts.
Unlimited Hot Water Supply: These heaters can provide an endless supply of hot water, which is crucial for commercial environments such as restaurants, salons, and laundromats that require consistent hot water for various tasks throughout the day.
Longer Lifespan: With proper maintenance, electric tankless water heaters can last significantly longer than traditional tank models. Their durability stems from their design, which minimizes sediment buildup and corrosion, thereby reducing the frequency of replacements.
Lower Risk of Water Damage: Since tankless water heaters do not store water, the risk of catastrophic leaks or bursts is greatly diminished. This feature not only protects the premises but also reduces the potential costs associated with water damage repairs.
How Do You Choose the Right Commercial Electric Tankless Water Heater for Your Business?
Choosing the right commercial electric tankless water heater for your business involves several key considerations:
- Flow Rate: The flow rate is crucial as it determines how much hot water the unit can deliver per minute. Businesses with high hot water demands, such as restaurants or hotels, will require units with higher flow rates to ensure a consistent supply during peak hours.
- Power Requirements: Assess the electrical requirements of the heater, including voltage and amperage. Ensure that your business’s electrical system can handle the heater’s demands to avoid overloading circuits and causing disruptions.
- Energy Efficiency: Look for models with high energy efficiency ratings, such as Energy Star certifications. High-efficiency units can significantly reduce operational costs and lower energy bills over time, making them a smart investment.
- Size and Installation Space: Consider the physical dimensions of the heater and the available installation space. Compact models may be suitable for businesses with limited space, while larger units may be necessary for extensive hot water needs.
- Brand Reputation and Warranty: Research brands known for reliability and customer service. A strong warranty can provide peace of mind and protect your investment against defects or failures, ensuring that your business does not face unexpected downtime.
- Maintenance Requirements: Evaluate how easy the unit is to maintain and what kind of regular servicing it may require. Some models are designed for minimal maintenance, which can save time and resources in a busy commercial setting.
- Temperature Control: Look for systems that offer precise temperature controls to ensure safety and efficiency. This feature is particularly important in commercial settings where specific temperatures are necessary for certain applications, such as food service.
What Flow Rate Is Necessary for Your Commercial Needs?
The flow rate necessary for your commercial needs depends on various factors such as the number of fixtures, the type of business, and the peak usage times.
- Fixture Count: The number of fixtures that require hot water directly affects the flow rate needed. For instance, a restaurant with multiple sinks, dishwashers, and other appliances will require a higher flow rate compared to a small office with just a few restrooms.
- Peak Usage Times: Understanding when your business experiences peak demand is crucial. If your establishment has specific hours when water usage spikes, you need a tankless water heater that can sustain that flow rate during peak times without running out of hot water.
- Temperature Rise Requirements: The difference between the incoming water temperature and the desired output temperature impacts the flow rate. In colder climates, a greater temperature rise is necessary, which may require a heater with a higher flow rate to meet the demands of your business.
- Type of Business: Different businesses have distinct hot water requirements. For example, a beauty salon may need consistent hot water for several hair washing stations, while a gym may require it mainly for showers, affecting the overall flow rate needed.
- Simultaneous Demand: Consider the likelihood of multiple fixtures being used at the same time. In a busy kitchen, for instance, several sinks and appliances may operate simultaneously, necessitating a higher flow rate to ensure hot water is available for all without interruption.
How Does Energy Efficiency Impact Your Operating Costs?
Energy efficiency significantly influences your operating costs by reducing the amount of energy consumed, leading to lower utility bills and maintenance expenses.
- Lower Energy Consumption: Energy-efficient appliances, such as the best commercial electric tankless water heater, use less electricity to operate, which directly reduces monthly energy bills. This translates to substantial savings over time, especially in commercial settings where hot water demand can be high.
- Reduced Maintenance Costs: Efficient systems often have fewer parts that wear out, which can decrease the need for repairs and maintenance. For instance, electric tankless water heaters typically require less upkeep compared to traditional storage water heaters, leading to lower overall operational costs.
- Incentives and Rebates: Many energy-efficient products qualify for government incentives or rebates, which can offset the initial investment cost. This financial support encourages businesses to invest in technologies like tankless water heaters, enhancing their energy efficiency while reducing the overall expenditure.
- Longer Lifespan: Energy-efficient appliances are often built with advanced technology and materials, leading to a longer operational lifespan. The longevity of products like commercial electric tankless water heaters means that businesses won’t need to replace them as frequently, further lowering long-term operating costs.
- Environmental Impact: By using less energy, efficient water heaters contribute to a reduction in greenhouse gas emissions. This not only aids in environmental sustainability but can also enhance a company’s reputation, potentially attracting eco-conscious customers and clients.
What Features Should You Look For in a Commercial Electric Tankless Water Heater?
When selecting the best commercial electric tankless water heater, consider the following features:
- Flow Rate: The flow rate, measured in gallons per minute (GPM), indicates how much hot water the heater can provide at a given time. It’s crucial to choose a model that can meet the peak demand of your commercial establishment, ensuring that multiple fixtures can be supplied simultaneously without running out of hot water.
- Energy Efficiency: Look for models with high energy efficiency ratings, such as Energy Star certification. An efficient unit will reduce operating costs and provide significant savings on energy bills over time, making it a smart investment for your business.
- Temperature Control: Advanced temperature control features allow for precise adjustments of the water temperature to suit different needs. This capability is especially important in commercial settings where water temperature requirements may vary between different applications like food service or cleaning.
- Size and Installation Flexibility: Compact designs are essential for commercial spaces with limited installation options. A tankless water heater that offers flexible installation configurations, such as wall-mounted or floor-standing, can better fit your specific space constraints.
- Durability and Build Quality: The materials used in the construction of the water heater affect its lifespan and reliability. Look for units made from high-quality components that can withstand heavy usage in commercial environments, ensuring long-term performance and reducing maintenance costs.
- Warranty and Support: A strong warranty and reliable customer support are vital for commercial equipment. Check the warranty length and what it covers, as well as the availability of customer service to assist with any issues that may arise after installation.
- Safety Features: Safety features such as over-temperature protection, leak detection, and automatic shut-off mechanisms are essential for preventing accidents and ensuring the safe operation of the water heater. These features help mitigate risks in a busy commercial environment.
- Compatibility with Existing Systems: Ensure that the tankless water heater is compatible with your current plumbing and electrical systems. This compatibility will help streamline installation and avoid additional costs related to system upgrades or modifications.
Which Commercial Electric Tankless Water Heaters Are Considered the Best in the Market?
The best commercial electric tankless water heaters are known for their efficiency, performance, and durability. Here are some top options:
- Stiebel Eltron Tempra Plus Series: This model is highly regarded for its advanced flow control technology that maintains a steady temperature regardless of water demand.
- Rheem RTEX Series: The Rheem RTEX series is praised for its compact design and easy installation, making it a popular choice for commercial applications.
- Ecosmart ECO Series: Known for its energy efficiency, the Ecosmart ECO Series features self-modulating technology that adjusts energy usage based on hot water demand.
- Camplux 5L Portable Tankless Water Heater: This portable option is ideal for temporary commercial needs and offers a lightweight design with excellent heating capacity.
- Bosch Tronic 3000 Series: The Bosch Tronic 3000 is recognized for its robust build and consistent performance, suitable for various commercial hot water needs.
Stiebel Eltron Tempra Plus Series: The Tempra Plus series stands out due to its digital temperature control and the ability to provide hot water on demand without fluctuations. This model is capable of handling simultaneous demands, making it ideal for commercial settings where multiple outlets may require hot water at the same time.
Rheem RTEX Series: The Rheem RTEX series features a sleek design that can fit into tight spaces, and its installation process is user-friendly. It also offers a digital temperature display and adjustable settings, allowing businesses to optimize their hot water supply effectively.
Ecosmart ECO Series: The Ecosmart ECO Series is designed with energy efficiency in mind, utilizing a self-modulating system that can significantly reduce energy costs. This model is also compact, making it easy to install in various commercial locations while providing reliable hot water whenever needed.
Camplux 5L Portable Tankless Water Heater: The Camplux 5L is a versatile and portable unit that provides instant hot water, making it suitable for outdoor events or temporary setups. It operates on propane gas but is often favored in commercial scenarios requiring mobility and ease of use.
Bosch Tronic 3000 Series: The Bosch Tronic 3000 series is designed for durability and reliability, featuring high-quality materials that ensure a long lifespan. It’s suitable for both point-of-use and whole-house applications, providing versatile solutions for various commercial hot water needs.
What Do Customer Reviews Reveal About Commercial Electric Tankless Water Heaters?
Customer reviews provide valuable insights into the performance and reliability of commercial electric tankless water heaters.
- Energy Efficiency: Many customers highlight the energy efficiency of these water heaters, noting that they reduce utility bills significantly compared to traditional tank heaters. Users appreciate that these systems only heat water on demand, which minimizes energy waste and results in cost savings over time.
- Consistent Hot Water Supply: Reviews often mention the ability of commercial electric tankless water heaters to supply a continuous flow of hot water, which is essential for businesses with high demand. Customers report that this feature eliminates the anxiety of running out of hot water during peak usage times.
- Space Saving Design: Users frequently praise the compact size of electric tankless water heaters, which allows for installation in tight spaces. This space-saving design is especially beneficial for commercial environments where floor space is at a premium.
- Installation and Maintenance: Many reviews address the ease of installation and low maintenance requirements of these units. Customers appreciate that electric models often require less complex installation compared to gas models and that periodic maintenance is straightforward.
- Longevity and Reliability: Customers often comment on the durability and longevity of electric tankless water heaters. Many reviews indicate that these units can last up to 20 years with proper care, providing a reliable hot water solution for businesses.
- Customer Service Experience: A significant number of reviews touch on the customer service provided by manufacturers. Positive experiences with responsive support teams can enhance customer satisfaction, while negative experiences may deter potential buyers.
- Temperature Control: Users frequently mention the precise temperature control features available in electric tankless models. This ability to set specific temperatures ensures that businesses can deliver hot water at the desired level, enhancing user comfort and satisfaction.