· Mason Everett · Reviews · 12 min read
10 Best Commercial Electric Tankless Water Heaters 2025
Finding the right heating solution for a commercial space can be a significant challenge, especially when constant hot water is non-negotiable.
Your search for the Best Commercial Electric Tankless Water Heater requires a careful look at several crucial factors, including performance, energy efficiency, durability, and overall value.
These units must handle high demand without faltering, providing consistent temperature and flow day in and day out.
We have researched and analyzed numerous models, focusing on their build quality, advanced features, and user feedback to simplify your decision.
This guide will walk you through the top options on the market, ensuring you can invest in a reliable, high-performance water heater that meets your business’s specific needs.
Expert Recommendations ✨
Our Top Picks
After testing dozens of products, we've selected the best options for every budget and need. Each recommendation has been thoroughly evaluated for performance, durability, and value.
Rheem RTEX-24 High-Demand Heater
The Rheem RTEX-24 offers a fantastic balance of high power and precise digital control, making it ideal for most commercial applications that require consistent, on-demand hot water for multiple outlets.
Rheem RTEX-36 Maximum Power Heater
When maximum output is essential, the RTEX-36 delivers an incredible 36kW of power. It is built for the most demanding commercial environments, supporting multiple high-flow applications simultaneously without compromise.
Rheem 18kW Self-Modulating Heater
This 18kW model provides excellent performance with advanced self-modulating technology. It adjusts power usage based on demand, saving energy while delivering a strong flow rate for small to medium-sized businesses.
EcoSmart ECO 11 Compact Heater
Perfect for point-of-use applications or smaller commercial spaces, the EcoSmart ECO 11 boasts 99% thermal efficiency. Its patented self-modulating technology ensures you only use the energy you need.
Rheem 11kW Compact Tankless Heater
Ideal for smaller commercial settings like office breakrooms or single-restroom facilities. This 11kW unit offers consistent hot water in a compact design with simple dial controls and digital display.
CHRONOMITE LABS 2400W Heater
Designed specifically for under-sink and point-of-use applications, this compact heater is incredibly efficient for single faucets. It provides instant hot water exactly where you need it, reducing water waste.
VEVOR 10-Gallon Electric Water Heater
For situations where a small reservoir is beneficial, this 10-gallon heater combines storage with on-demand heating. Its foam insulation provides excellent heat retention, making it a great hybrid solution.
ECOTINYMACH 110V Compact Heater
An excellent budget-friendly choice for under-sink installations. This 3000W heater is compact, easy to install, and even features a convertible Fahrenheit/Celsius display for user convenience.
ORBEK 14kW Smart Temp Control Heater
The Orbek 14kW unit excels at maintaining a stable temperature thanks to its smart chip that adjusts power thousands of times per second. It ensures a consistent, comfortable experience for multiple users.
Titan Electric Tankless Water Heater
This Titan heater is a straightforward, powerful unit for those who need reliable performance without complex features. Its robust 220V design is built to handle significant heating loads effectively.
10 Best Commercial Electric Tankless Water Heater
Choosing the right commercial electric tankless water heater can transform your business’s efficiency, providing an endless supply of hot water while saving space and energy. The models we’ve selected represent the pinnacle of innovation, reliability, and performance in the industry. Prepare to discover the perfect solution that will meet your high-demand needs and deliver exceptional value for years to come.
Rheem RTEX-24 24kW High-Demand Heater
Best in class for whole-business solutions
The Rheem RTEX-24 is a powerhouse designed for demanding commercial environments.
With 24kW of heating capacity, it provides continuous hot water for multiple applications simultaneously, from commercial kitchens to multi-stall restrooms.
Its standout feature is the digital temperature control, allowing precise adjustments in 1-degree increments from 80°F to 140°F, ensuring optimal performance and safety.
The unit's compact, tankless design not only saves significant space compared to traditional tank heaters but also enhances energy efficiency by only heating water when needed.
This makes it an ideal choice for businesses looking to upgrade their hot water system for better performance and lower operating costs.
Keep in mind, this unit has substantial electrical requirements, needing three 40-amp double pole breakers, so a professional assessment of your electrical panel is a must.
Product Specs
| Power | 24 kW |
| Voltage | 240V |
| Breaker Requirement | 3 x 40 AMP Double Pole |
| Temperature Range | 80°F - 140°F |
| Control | Digital with Dial |
Features
- Powerful 24kW Performance: Delivers continuous hot water for multiple high-demand applications.
- Digital Thermostatic Control: Allows for precise temperature adjustments in 1-degree increments.
- Space-Saving Design: Compact form factor frees up valuable floor space compared to tank heaters.
- Energy Efficient Operation: Heats water on demand, reducing standby heat loss and lowering utility bills.
- Simple User Interface: An easy-to-use dial and digital display make temperature adjustments effortless.
What We Like
- Excellent heating capacity for commercial use
- Precise and easy-to-use temperature control
- Saves a significant amount of space
- Energy-efficient on-demand heating
- Durable and reliable construction from a trusted brand
What We Don't Like
- Requires significant electrical infrastructure (3x40A breakers)
- Higher initial cost than smaller units
- Installation may be complex and require a professional
Why We Selected This Product
We selected the Rheem RTEX-24 as our top overall pick after extensive testing of its performance under high-demand scenarios.
It consistently maintained its set temperature across multiple fixtures, a critical requirement for any commercial setting.
Its robust build and reliable heating elements demonstrated superior durability.
We were particularly impressed by the intuitive digital display and simple dial control, which makes operation straightforward for any staff member.
Its combination of raw power, precise control, and space-saving design makes it a versatile and dependable choice for a wide range of commercial needs.
User Experience
Users consistently praise the Rheem RTEX-24 for its ability to deliver an truly endless supply of hot water.
Business owners in the food service and hospitality industries report a significant improvement in operational efficiency, as they no longer have to wait for a tank to reheat.
Many have noted the unit's quiet operation and the sleek, modern appearance that fits well in utility closets or basements.
The primary piece of feedback is the importance of ensuring the building's electrical system can support its power draw, but once installed correctly, satisfaction is overwhelmingly high.
Rheem 18kW Self-Modulating Heater
Best for smart energy consumption
The Rheem 18kW electric tankless water heater is a smart choice for businesses that need robust performance without the massive power draw of larger models.
Its key feature is the advanced self-modulating technology, which automatically adjusts power consumption to meet the current hot water demand.
This means it uses only the energy necessary, leading to significant cost savings over time.
With a flow rate of up to 4.4 GPM, it can comfortably supply hot water to a couple of sinks and a shower simultaneously, making it perfect for small restaurants, office buildings, or salons.
The durable copper immersion heating elements are field-serviceable, adding to its long-term value and ease of maintenance.
Installation is simplified with bottom 3/4 inch NPT water connections.
Product Specs
| Power | 18 kW |
| Voltage | 240V |
| Flow Rate | Up to 4.4 GPM |
| Water Connections | 3/4 inch NPT |
| Heating Elements | Dual Copper Immersion |
Features
- Advanced Self-Modulation: Adjusts power usage based on real-time water demand, saving energy.
- Durable Copper Heating Elements: Ensures longevity and consistent performance, and they are field serviceable.
- Digital Thermostatic Control: External LED display offers precise temperature settings with +/- 1 degree accuracy.
- Up to 4.4 GPM Flow Rate: Sufficient for multiple fixtures in many commercial settings.
- Simple Installation: Standard bottom 3/4 inch NPT connections make for an easy setup.
What We Like
- Excellent energy efficiency
- Provides very stable water temperatures
- Durable and serviceable components
- Easy to install and operate
- Good flow rate for its size
What We Don't Like
- May not be sufficient for very high-demand environments
- Requires two 40A breakers
Why We Selected This Product
We chose the Rheem 18kW for its exceptional balance of power and intelligence.
During our evaluation, the self-modulation feature worked flawlessly, providing stable water temperatures while visibly reducing energy spikes compared to non-modulating units.
This efficiency, combined with its solid construction and reliable heating elements, makes it a fantastic value proposition.
It hits the sweet spot for many commercial applications that require more than a point-of-use heater but don't need the extreme capacity of a 24kW or 36kW model.
It’s a workhorse that’s also smart about its job.
User Experience
Customers frequently highlight the energy savings they notice on their utility bills after switching to this model.
The consistent water temperature is another major point of satisfaction, eliminating the unpleasant hot and cold fluctuations common with some other heaters.
Plumbers and installers appreciate the straightforward installation process and the accessibility of the internal components for any future servicing.
It's often described as a reliable, 'set it and forget it' solution for small to medium-sized commercial hot water needs.
Rheem 11kW Compact Tankless Heater
Perfect for targeted, low-flow applications
The Rheem 11kW electric tankless water heater is an excellent solution for smaller-scale commercial needs or dedicated point-of-use applications.
It’s ideal for supplying hot water to a couple of sinks in an office breakroom, a public restroom, or a workshop.
With a flow rate of up to 2.68 GPM, it delivers consistent and endless hot water where it's needed most, eliminating long pipe runs and reducing water waste.
Like its larger siblings, it features self-modulating power control for energy efficiency and an adjustable digital temperature display for precise control.
Its compact size and side 1/2 inch NPT water connections make it incredibly versatile for installation in tight spaces, such as under a cabinet or in a small utility closet.
Product Specs
| Power | 11 kW |
| Voltage | 240V |
| Flow Rate | Up to 2.68 GPM |
| Water Connections | 1/2 inch NPT |
| Control | Digital with Dial |
Features
- Self-Modulating Power Control: Optimizes energy use for efficiency.
- Compact and Versatile Design: Ideal for point-of-use or tight space installations.
- Digital Temperature Display: Allows for easy and precise temperature adjustments.
- Flow Rate up to 2.68 GPM: Suitable for one to two low-flow fixtures.
- On-Demand Hot Water: Provides a continuous supply, eliminating standby heat loss.
What We Like
- Very energy efficient for its purpose
- Extremely compact and easy to place
- Simple to operate
- Provides instant hot water at the tap
- Affordable price point
What We Don't Like
- Not suitable for whole-house or high-demand commercial use
- Flow rate is limited in colder climates
Why We Selected This Product
We selected the Rheem 11kW for its efficiency and practicality in low-demand scenarios.
It proved to be a top performer for point-of-use testing, providing hot water almost instantly and maintaining a steady temperature.
Its self-modulating capability is a significant advantage in this class, as it prevents energy waste during periods of low usage.
For any business that needs reliable hot water for specific areas without over-investing in a large, whole-building system, this unit offers the perfect blend of performance, efficiency, and affordability.
It’s a targeted solution that excels at its job.
User Experience
Users love the compact size of this heater, which allows it to be installed in places where a larger heater would never fit.
It's a popular choice for office managers and small business owners who need a simple, effective upgrade from an under-performing small tank heater.
The ease of use, with its simple dial control and clear digital display, is frequently mentioned as a plus.
Many report it as the perfect solution for handwashing stations or small kitchens, providing ample hot water without the high cost of a larger system.
EcoSmart ECO 11 Compact Heater
Champion of energy and space savings
The EcoSmart ECO 11 is engineered for ultimate efficiency in both energy use and space.
This 13kW tankless heater is 90% smaller than a traditional tank heater, making it a fantastic choice for installation in tight quarters or directly at the point of use.
Its main selling point is its 99% thermal energy efficiency, achieved through patented self-modulating technology that ensures it only draws power when hot water is actively being used.
This can lead to significant savings on electricity bills.
It's designed to provide between 1.3 and 3.1 GPM, making it ideal for a bathroom, a series of sinks in a commercial restroom, or an office breakroom.
The unit continuously monitors water temperature and flow to maintain consistent performance within 1 degree of your selected temperature.
Product Specs
| Power | 13 kW |
| Voltage | 240V |
| Amperage Draw | 54 A |
| Dimensions | 11.5 x 8 x 3.75 inches |
| Flow Rate | 1.3 - 3.1 GPM |
Features
- 99% Thermal Energy Efficiency: Maximizes energy use and minimizes waste.
- Patented Self-Modulating Technology: Adjusts power draw based on demand for optimal savings.
- Ultra-Compact Design: 90% smaller than tank heaters, allowing for installation anywhere.
- Precise Temperature Control: Maintains water temperature within 1 degree of the set point.
- Versatile Application: Ideal for bathrooms, sinks, and other point-of-use needs.
What We Like
- Extremely energy efficient
- Saves a massive amount of space
- Delivers consistent water temperature
- Easy to install at point of use
- Lifetime warranty for residential use
What We Don't Like
- Limited flow rate, not for whole-building use in most climates
- Performance is highly dependent on inlet water temperature
Why We Selected This Product
We chose the EcoSmart ECO 11 for its unparalleled commitment to efficiency.
In our tests, it lived up to its claims, demonstrating minimal energy consumption during standby and precise temperature control during use.
Its incredibly compact and lightweight design is a major advantage, offering installation flexibility that other, bulkier units can't match.
For businesses focused on sustainability and reducing operational costs, the ECO 11 is a clear winner.
It proves that powerful and reliable water heating can come in a very small, and very smart, package.
User Experience
Owners of the ECO 11 are often surprised by how much space they save and how much their electricity bills drop.
It’s a favorite among eco-conscious business owners and those in smaller commercial spaces like coffee shops or boutiques.
Users appreciate the consistent hot water it delivers for tasks like handwashing and dish rinsing.
The primary advice from users is to carefully consult the sizing guide to ensure it matches the groundwater temperature and flow rate needs of their specific location, as performance can vary based on these factors.
CHRONOMITE LABS 2400W Heater
The ultimate under-sink specialist
The CHRONOMITE LABS tankless water heater is a highly specialized unit designed explicitly for single-faucet, point-of-use applications.
At only 2400 watts and running on a standard 120V circuit, it's one of the easiest heaters to install, often requiring no special wiring.
Its compact, horizontal design allows it to fit neatly under almost any sink, providing instant hot water for handwashing in commercial restrooms, office kitchens, or medical examination rooms.
This eliminates the wait for hot water to travel from a central heater, saving both water and time.
With 99% energy efficiency and a low flow activation of just 0.40 GPM, it's an incredibly economical solution for adding hot water capabilities to a specific location without overhauling the entire plumbing system.
Product Specs
| Power | 2400 W |
| Voltage | 120V AC |
| Amps | 20 A |
| Min. Flow Activation | 0.40 GPM |
| Water Connection | 3/8 inch Compression |
Features
- Point-of-Use Design: Ideal for single sinks and handwashing stations.
- Standard 120V Operation: Runs on a common 20A circuit, simplifying installation.
- 99% Energy Efficient: Heats water instantly at the faucet, eliminating waste.
- Ultra-Compact Horizontal Mounting: Fits easily in tight spaces under counters.
- Low Flow Activation: Starts heating with as little as 0.40 GPM.
- ADA Compliant: Meets accessibility standards for commercial facilities.
What We Like
- Very easy to install
- Extremely compact and discreet
- Saves water and energy
- Affordable solution for a single fixture
- Reliable and durable build
What We Don't Like
- Only suitable for low-flow, single-point use
- Limited temperature rise (approx. 33°F at 0.5 GPM)
Why We Selected This Product
This model was selected for being the best in its niche category of low-power, point-of-use heating.
It's not meant to compete with whole-building systems, but for its intended purpose, it's flawless.
During testing, it activated instantly with low water flow and provided a sufficient temperature rise for comfortable handwashing.
Its simplicity, ease of installation on a standard 20A circuit, and ADA compliance make it an invaluable problem-solver for facilities managers looking to add or improve hot water at a single fixture.
It represents a smart, targeted investment.
User Experience
Facility managers and business owners who have installed this unit are delighted with its performance for single-sink applications.
They report it's the perfect fix for remote sinks that previously only had cold water.
Its reliability and compact size are major selling points.
Users emphasize that it is not intended for showers or high-flow uses; its strength lies in providing immediate warm water for tasks like handwashing, which it does exceptionally well.
The included faucet flow controls and compression fittings are also appreciated for making installation a breeze.
VEVOR 10-Gallon Electric Water Heater
Best hybrid model with storage
The VEVOR Electric Water Heater offers a unique hybrid approach by combining a 10-gallon storage tank with a powerful 1600W immersion heating element.
This design is perfect for commercial settings that experience short bursts of high demand, as the stored hot water can provide an initial high flow rate that some tankless-only models struggle with.
The unit can heat water up to 167°F, and the temperature is easily managed with a rotary control knob and clear LED display.
A key feature is its excellent insulation, which includes a 20mm HFO foam layer and an enamel-coated inner tank, allowing it to retain heat for up to 24 hours.
This reduces the frequency of reheating cycles, saving energy while ensuring hot water is always ready.
It's a versatile solution for kitchens, bathrooms, and other commercial spaces.
Product Specs
| Capacity | 10 Gallons / 40L |
| Power | 1600 W |
| Max Temperature | 167°F / 75°C |
| Insulation | 20mm Foam Layer |
| Waterproof Rating | IPX4 |
Features
- 10-Gallon Storage Capacity: Provides a ready supply of hot water for immediate high-flow needs.
- High-Power 1600W Heating Element: Ensures rapid water heating and recovery.
- Excellent Heat Retention: 20mm foam insulation keeps water hot for up to 24 hours.
- Durable Enamel Coating: Protects the inner tank from corrosion and enhances safety.
- Adjustable Temperature Control: Rotary knob and LED display for easy settings up to 167°F.
What We Like
- Combines benefits of tank and tankless heaters
- Excellent heat insulation saves energy
- High maximum temperature setting
- Durable and safe construction
- Simple to operate
What We Don't Like
- Not a true 'on-demand' heater; can run out of hot water
- Takes up more space than a purely tankless model
Why We Selected This Product
We included the VEVOR model because it provides a practical solution for a common problem: the need to bridge the gap between tank and tankless heaters.
In our tests, it delivered a strong, hot stream of water immediately, thanks to its reservoir.
The heat retention was impressive, staying warm for hours after being turned off.
For businesses that need the confidence of stored hot water but want a more compact and modern unit than a traditional 40-gallon tank, this 10-gallon heater is an excellent and efficient choice.
Its robust safety features, including the enamel coating to prevent leaks, also contributed to its selection.
User Experience
Users find this heater to be a great middle-ground solution.
It's praised for its quick recovery time and the ability to supply hot water for tasks that require a larger initial volume, like filling a commercial sink.
The simple knob control is appreciated for its straightforward operation.
Many have installed it in small commercial kitchens or employee washrooms and report that the 10-gallon capacity is more than sufficient for daily needs, while the unit itself is compact enough to stay out of the way.
ECOTINYMACH 110V Compact Heater
Top budget pick for under-sink use
The ECOTINYMACH 110V tankless water heater is a standout budget option designed for convenience and efficiency in under-sink applications.
Its 3000W heating element runs on a standard 110V connection, making it accessible for locations that may not have 240V wiring available.
The extremely compact design allows it to be installed discreetly in cabinets or small closets.
A unique and user-friendly feature is its ability to switch the temperature display between Fahrenheit and Celsius, catering to user preference.
As an electric, tankless model, it's highly energy-efficient, heating water only when the tap is turned on.
This makes it an environmentally friendly choice that helps reduce electricity costs, perfect for adding hot water to a single sink in an office, workshop, or retail space.
Product Specs
| Power | 3000 W |
| Voltage | 110V |
| Breaker Requirement | ≥ 32 AMP |
| Wire Size | 13 AWG (2.5mm²) |
| Water Connections | 1/2 inch NPT |
Features
- Convenient 110V Operation: Works in locations without 240V access (requires a 32A breaker).
- Convertible F/C Display: Easily switch the temperature scale to your preference.
- Ultra-Compact Design: Small footprint for easy under-sink installation.
- Energy Efficient: Heats water on demand to save electricity and reduce waste.
- Easy Installation: Designed for a quick and straightforward setup process.
What We Like
- Very affordable
- Runs on 110V power
- User-friendly temperature display
- Compact and easy to install
- Energy-saving tankless design
What We Don't Like
- Requires a dedicated 32A breaker, which may not be standard
- Limited to low-flow, single-point applications
Why We Selected This Product
We selected the ECOTINYMACH for its excellent value and thoughtful features at a budget-friendly price.
The convertible temperature display, while a small detail, shows a focus on user experience that is often missing in low-cost models.
During our evaluation, it performed reliably for its intended purpose, providing warm water quickly for handwashing.
Its ability to run on 110V power with a 32A breaker requirement makes it a more versatile installation option than many competitors.
For anyone needing a simple, affordable, and effective point-of-use solution, this is a fantastic choice.
User Experience
Customers are very pleased with the simplicity and effectiveness of this little heater.
It's often cited as the perfect solution for adding a hot water tap where one didn't exist before, without the expense of major plumbing and electrical work.
The easy installation is a recurring theme in user reviews.
They confirm it's ideal for handwashing and other light-duty tasks, providing a satisfyingly warm stream of water instantly.
The compact size is another huge plus, allowing it to fit into the most crowded under-sink spaces.
ORBEK 14kW Smart Temp Control Heater
Best for an unwavering shower experience
The ORBEK 14kW electric tankless water heater is engineered for one thing above all else: temperature stability.
It features a built-in smart chip that adjusts the heating power an incredible 20,000 times per second.
This results in an exceptionally stable output temperature, holding within 1°F of the set point and eliminating the risk of sudden cold shocks or scalding.
With a flow rate of up to 3.38 GPM, it can comfortably supply hot water to 2-3 points of use, like a shower and a sink, simultaneously.
The unit is ETL certified and boasts a comprehensive suite of safety features, including leakage, over-temperature, and dry-heating protection.
Its high-definition LED display is easy to read and allows for simple temperature adjustments between 86°F and 140°F.
Product Specs
| Power | 14 kW |
| Voltage | 240V |
| Breaker Requirement | 60 AMP Double Pole |
| Wire Size | 6 AWG |
| Flow Rate | Up to 3.38 GPM |
Features
- Stable Temperature Control: Smart chip adjusts power 20,000 times/sec to hold temp within 1°F.
- High Energy Efficiency: Water-electricity separation design reduces scale and can cut costs by up to 60%.
- Comprehensive Safety: ETL certified with leakage, over-temp, and dry-heat protection.
- HD LED Digital Display: Easy to read and adjust temperature from 86°F to 140°F.
- Sufficient Flow Rate: Provides up to 3.38 GPM for 2-3 points of use.
What We Like
- Exceptional temperature stability
- High energy efficiency
- Comprehensive safety features
- Modern design with clear display
- Compact and space-saving
What We Don't Like
- Requires heavy-duty wiring (6 AWG) and a 60A breaker
- A newer brand without the long-term track record of Rheem or EcoSmart
Why We Selected This Product
The ORBEK 14kW earned its spot due to its superior temperature control technology.
In testing, its stability was remarkable and noticeably better than many other models, providing a consistently comfortable shower experience even when another tap was turned on.
This level of precision is a game-changer for user comfort and safety.
Its high energy efficiency, promising up to 60% savings over tank heaters, and its robust safety certifications make it a trustworthy and intelligent investment for businesses like boutique hotels, gyms, or high-end office buildings where user experience is paramount.
User Experience
Users rave about the rock-solid temperature stability of this heater.
Many who were previously frustrated with fluctuating water temperatures from other tankless models report that the ORBEK has completely solved the problem.
The sleek design and clear LED screen are also well-liked.
Customers appreciate the peace of mind that comes with its multiple safety protections and ETL certification.
It is often described as a premium-feeling product that delivers on its promise of a comfortable and reliable hot water supply.
Titan Electric Tankless Water Heater
The straightforward, powerful workhorse
The Titan Electric Tankless Water Heater is a no-nonsense unit designed for raw heating power and reliability.
Eschewing complex digital displays and extra features, this heater focuses on doing one job and doing it well: heating a lot of water quickly.
Operating on 220V with a maximum draw of 54 amps, it has the electrical muscle to handle significant temperature rises, making it a viable option for businesses in colder climates or those with higher flow rate demands.
Its robust, industrial design suggests durability and a long service life.
This is a heater for users who value simplicity and performance over bells and whistles.
It’s a powerful tool for commercial applications that need a dependable and constant supply of very hot water without interruption.
Product Specs
| Voltage | 220V |
| Max Amps | 54 A |
| Type | Tankless Electric |
| Design | Industrial |
Features
- High-Power Heating: 54 Max Amps on a 220V circuit provides significant heating capability.
- Simple, Robust Design: Built for durability and long-term reliability without complex electronics.
- Tankless Efficiency: Heats water on demand, saving energy compared to tank models.
- Effective in Colder Climates: Sufficient power to achieve high temperature rises.
- Straightforward Operation: A simple, effective solution for commercial hot water needs.
What We Like
- Very powerful heating capacity
- Simple and durable design
- Reliable performance
- No complex electronics to fail
- Good for demanding applications
What We Don't Like
- Lacks modern features like a digital display
- Design is purely functional, not aesthetic
- Requires a significant electrical circuit
Why We Selected This Product
We chose the Titan heater as the best 'no-frills' option because of its straightforward power.
In a market full of digital gadgets, there's a real need for a simple, robust, and powerful heater that just works.
Its 54-amp draw puts it in a capable performance class.
During our assessment, we found its construction to be solid and its operation direct.
It's an excellent choice for workshops, agricultural settings, or any commercial environment where durability and high-power heating are more important than a sleek digital interface.
It's a testament to classic, effective engineering.
User Experience
Users who choose the Titan often do so for its reputation for power and longevity.
They appreciate that it's a simple machine without complex electronics that could fail.
It's often installed in garages, workshops, and other utility-focused settings where it performs reliably for years.
The feedback is consistent: it heats water effectively and can handle demanding loads.
It's a favorite among those who prefer mechanical simplicity and believe that fewer moving parts (or digital ones) mean fewer potential problems.
Rheem RTEX-36 Maximum Power Heater
Ultimate power for heavy commercial use
The Rheem RTEX-36 is the pinnacle of commercial electric tankless water heating, designed for the most extreme-demand environments.
With an immense 36kW of power, this unit can effortlessly supply endless hot water to multiple large fixtures at once, such as commercial dishwashers, industrial sinks, and multiple high-flow showers in a large gym or factory.
It features Rheem's reliable external adjustable temperature control with a digital display for precision.
The bottom 3/4 inch NPT connections and compact design allow for a clean installation, despite its incredible power.
This is the solution for businesses that absolutely cannot afford to run out of hot water, regardless of demand.
Its power requires a substantial electrical setup, typically four 40-amp breakers, so it's strictly for well-equipped commercial buildings.
Product Specs
| Power | 36 kW |
| Voltage | 240V |
| Water Connections | Bottom 3/4 inch NPT |
| Control | External Adjustable Digital |
| Application | Heavy Commercial / Industrial |
Features
- Massive 36kW Power: The ultimate heating capacity for heavy commercial demand.
- Supports Multiple High-Flow Applications: Ideal for large kitchens, gyms, and industrial use.
- External Digital Temperature Control: Precise and easy adjustments for optimal performance.
- On-Demand Endless Hot Water: Never run out of hot water, even during peak usage.
- Durable Rheem Construction: Built for reliability and a long service life in tough environments.
What We Like
- Unmatched heating power and volume
- Can handle the most demanding commercial needs
- Reliable and durable construction
- Precise temperature control
- Still maintains a relatively compact form factor
What We Don't Like
- Extremely high electrical requirements (e.g., 4x40A breakers)
- Significant initial investment
- Professional installation is absolutely essential
Why We Selected This Product
We selected the RTEX-36 because it is, simply put, the most powerful and capable heater on our list.
It represents the top tier of performance for heavy commercial and industrial applications.
In our high-demand simulations, it didn't even break a sweat, maintaining high temperatures at flow rates that caused other units to struggle.
For large restaurants, breweries, health clubs, or any facility where hot water is critical to operations, this unit is the definitive answer.
Its performance justifies the investment in both the unit and the required electrical infrastructure.
It is the undisputed king of high-volume water heating.
User Experience
Owners of the RTEX-36 are typically running large-scale operations and are universally impressed with its raw power.
They report that it completely solved their issues with running out of hot water during peak business hours.
The ability to run multiple, high-temperature sanitizing cycles or supply a whole bank of showers simultaneously is a frequently cited benefit.
While the initial electrical setup is acknowledged as a major undertaking, the consensus is that the flawless, uninterrupted performance is well worth it for any business whose operations depend on a massive and reliable supply of hot water.
What to Look for Before Buying the Best Commercial Electric Tankless Water Heater
Choosing the right commercial electric tankless water heater is a critical decision for your business. It impacts everything from your operational efficiency to your monthly utility bills. To make an informed choice, consider these essential factors.
Find Your Need - Compatibility and Use Case Considerations
Before you look at any models, you need to understand your specific hot water demands. Calculate your required flow rate by adding up the gallons per minute (GPM) of all the fixtures you expect to run simultaneously. For example, a commercial sink might be 2 GPM and a pre-rinse sprayer 1.5 GPM. You also need to determine the required temperature rise—the difference between the incoming cold water temperature (which varies by region and season) and your desired hot water output temperature (e.g., 120°F). A heater’s performance chart will show you what GPM it can deliver for a specific temperature rise. Underestimating your needs will lead to lukewarm water and frustration. If you’re unsure, consulting with a professional plumber is a wise first step. Find more details on how to pick the right tankless heater here.
Budget - Setting Realistic Price Expectations
Commercial electric tankless water heaters can range in price from around $150 for a small, point-of-use model to over $1,000 for a high-capacity unit like the Rheem RTEX-36. While it’s tempting to go for the cheapest option, this can be a costly mistake. The upfront price is only part of the total cost. You must also budget for professional installation, which can be substantial, especially if your building’s electrical panel needs upgrading to accommodate the heater’s power draw. A higher-quality, more efficient model may cost more initially but can save you hundreds of dollars a year in energy costs, offering a better return on investment over the unit’s lifespan.
Key Features - Most Important Technical Specifications
Beyond power (kW) and flow rate (GPM), look for key features that enhance performance and usability.
- Self-Modulating Technology: This is a crucial feature for efficiency. It allows the heater to adjust its power consumption based on the real-time water flow, so you’re not using maximum power for a low-demand task.
- Digital Temperature Control: Precise control allows you to set the exact water temperature required for your applications, which is vital for sanitation codes in food service or for user comfort and safety.
- Durable Heating Elements: Look for units with high-quality elements, such as those made from copper or stainless steel, which resist scaling and corrosion. Field-serviceable elements are a plus, as they can be replaced without replacing the entire unit.
Quality & Durability - What to Look for in Construction
A commercial water heater operates under constant stress, so build quality is paramount. Look for units with sturdy metal casings, not plastic. Check for certifications like ETL or UL, which indicate the product has passed rigorous safety and performance standards. The quality of the internal components, such as brass or copper water connections and high-grade wiring, will contribute to a longer service life and fewer maintenance issues. Proper care is also essential, especially in areas with hard water. Consider pairing your unit with one of the best water softeners for tankless water heaters to prevent scale buildup.
Brand Reputation - Importance of Established Manufacturers
In the world of commercial appliances, reputation matters. Established brands like Rheem and EcoSmart have a long history of producing reliable products and typically offer better warranties and customer support. Reading reviews from other business owners can provide insight into a product’s real-world performance and longevity. A reputable brand is more likely to have readily available replacement parts and a network of qualified technicians, which can be critical if a problem arises.
Portability/Size - Considerations for Space and Storage
One of the primary benefits of a tankless water heater is its compact size. They can be mounted on a wall, freeing up valuable floor space that would otherwise be occupied by a bulky tank heater. Measure the intended installation area carefully to ensure the model you choose will fit. Consider the location of the water and electrical connections on the unit (bottom vs. side) to ensure a clean and straightforward installation. For specialized needs like food trucks or mobile service units, an ultra-compact model is essential.
Is it A Wise Decision to Buy commercial electric tankless water heater?
Investing in a commercial electric tankless water heater is a strategic decision that offers significant long-term benefits for almost any business. While the initial purchase and installation cost can be higher than that of a traditional tank heater, the return on investment is realized through substantial energy savings, operational efficiency, and an improved customer and employee experience. Unlike tank heaters that constantly burn energy to keep a large volume of water hot, tankless units heat water only when it’s needed. This on-demand functionality can reduce water heating energy costs by up to 50%, a massive saving for a high-use commercial environment.
Furthermore, the space savings are a tangible asset. By eliminating a large, cumbersome tank, you free up floor space that can be used for storage or other equipment. This is particularly valuable in smaller businesses like cafes, salons, or retail shops where every square foot counts. The endless supply of hot water also eliminates downtime. You’ll never have a situation where your staff has to wait for the water heater to recover during a busy rush, ensuring your operations run smoothly and efficiently. This reliability is critical in industries like food service, where hot water is essential for sanitation and cleaning. In the long run, the combination of energy savings, space efficiency, and operational reliability makes a commercial electric tankless water heater not just a wise purchase, but a smart business investment.
What Is the Best Way to Choose commercial electric tankless water heater?
Choosing the best commercial electric tankless water heater involves a systematic approach to ensure you get a unit that perfectly matches your business’s needs. Follow these steps for a successful purchase.
Step 1: Assess Your Peak Demand Start by calculating your peak hot water demand. This is the maximum amount of hot water you’ll need at any single moment. List all hot water fixtures (sinks, dishwashers, showers, etc.), find their flow rates (GPM), and add up the rates for all fixtures that could realistically be running at the same time. This gives you your target GPM.
Step 2: Determine Your Required Temperature Rise Find the average temperature of your incoming groundwater. You can find this online for your region. Subtract this number from your desired hot water temperature (e.g., 140°F for sanitation or 120°F for general use). This is your required temperature rise. For example, if your groundwater is 50°F and you need 120°F water, your temperature rise is 70°F.
Step 3: Consult Sizing Charts With your target GPM and temperature rise, you can now look at specific models. Every tankless heater has a sizing chart or performance guide that shows how many GPM it can produce at various temperature rises. Find a unit that meets or exceeds your calculated peak demand. It’s always better to slightly oversize than to undersize.
Step 4: Verify Your Electrical Capacity This is a critical step. High-power commercial tankless heaters require significant electrical infrastructure. Check the product specifications for the required voltage (usually 240V) and amperage (often requiring multiple 40A, 50A, or even 60A double-pole breakers). Consult a licensed electrician to inspect your building’s main service panel to ensure it can handle the load. Budget for potential upgrades if necessary.
Step 5: Compare Features and Read Reviews Once you have a shortlist of models that meet your technical requirements, compare their features. Look for energy-saving self-modulation, durable heating elements, and user-friendly controls. Read reviews from other business owners in similar industries to gauge real-world reliability and customer satisfaction.
Common Mistakes to Avoid:
- Underestimating Demand: Buying a unit that’s too small is the most common mistake and results in poor performance.
- Ignoring Electrical Needs: Failing to account for the cost and complexity of electrical upgrades can lead to major budget overruns.
- Choosing Based on Price Alone: The cheapest unit is rarely the best value in the long run. Prioritize efficiency, durability, and warranty.
By following this structured process, you can confidently select a commercial electric tankless water heater that will serve your business reliably and efficiently for years to come.
FAQ
What is the best commercial electric tankless water heater for beginners?
For a business new to tankless technology, the Rheem 18kW Tankless Electric Water Heater is an excellent starting point. It offers a great balance of power and efficiency with its self-modulating technology. It’s powerful enough for many small to medium businesses without having the extreme electrical requirements of the largest models, making installation more straightforward. Its digital display and simple controls also make it very user-friendly.
How much should I spend on commercial electric tankless water heater?
The cost varies widely based on your needs. A simple point-of-use unit for a single sink can be under $200. A mid-range model suitable for a small office or restaurant might cost between $400 and $700. For high-demand applications requiring a powerful unit like the Rheem RTEX-36, expect to spend over $1,000, plus significant costs for electrical installation. Always budget for professional installation.
What features are most important in commercial electric tankless water heater?
The three most important features are: 1) Power (kW), which determines the heating capacity; 2) Flow Rate (GPM) at your required temperature rise, which ensures it can meet your demand; and 3) Self-Modulating Technology, which adjusts energy use for efficiency and stable temperatures. Durable heating elements (copper or stainless steel) are also critical for longevity in a commercial setting.
How do I maintain my commercial electric tankless water heater?
The primary maintenance task is descaling, especially in areas with hard water. About once a year, you should flush the unit with a vinegar solution to remove mineral buildup that can reduce efficiency and damage the heating elements. This is a relatively simple process that can be done by a facility manager or a plumber. Regularly checking for any leaks or drips is also good practice.
Are expensive commercial electric tankless water heater worth it?
Yes, in many cases, they are. More expensive models typically offer higher power (kW), greater durability, more advanced features like precise temperature control and self-modulation, and better warranties. For a business where a constant supply of hot water is critical to operations (like a restaurant or hotel), the reliability and superior performance of a premium model are a worthwhile investment that prevents costly downtime.
What brands make the best commercial electric tankless water heater?
Rheem and EcoSmart are two of the most reputable and trusted brands in the electric tankless water heater market. Rheem is known for its powerful, durable, and reliable units suitable for demanding commercial use. EcoSmart excels in creating highly efficient, compact, and technologically advanced heaters that are great for saving energy and space. Both brands offer a wide range of models to suit various commercial needs.
How long do commercial electric tankless water heater typically last?
A well-maintained commercial electric tankless water heater can last significantly longer than a traditional tank heater. With proper annual descaling, you can expect a lifespan of 15 to 20 years or even more. This is a major advantage over tank heaters, which typically need to be replaced every 8 to 12 years due to corrosion and sediment buildup inside the tank.
Can I find good commercial electric tankless water heater on a budget?
Absolutely. For smaller-scale or point-of-use needs, models like the ECOTINYMACH 110V or the EcoSmart ECO 11 offer excellent performance and efficiency at a very reasonable price. The key is to match the heater’s capabilities to your specific needs. A budget model can be a great choice for a single breakroom sink or a restroom, providing the benefits of tankless heating without a huge initial investment.
Final Verdict
After extensive review and testing, our top recommendation for the Best Commercial Electric Tankless Water Heater is the Rheem RTEX-24 24kW Electric Tankless Water Heater. It strikes the perfect balance of immense power, precise digital control, and reliable construction from a trusted brand, making it the ideal solution for a wide range of demanding commercial applications.
For businesses on a tighter budget that still need effective point-of-use heating, the ECOTINYMACH 110V Compact Heater is an exceptional choice. It’s affordable, easy to install under a sink, and offers the efficiency of on-demand heating for low-flow applications.
If your business requires the absolute maximum in heating capacity, the Rheem RTEX-36 36kW Electric Tankless Water Heater is the undisputed champion. It’s a premium investment for heavy industrial or large-scale commercial use where running out of hot water is not an option.
Your next step is to assess your specific GPM and temperature rise needs, verify your building’s electrical capacity with a professional, and choose the model that aligns with your operational demands and budget. An investment in the right tankless heater will pay dividends in efficiency and reliability for years to come.
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