If you’re in the market for a commercial tankless water heater, you’ve got plenty of efficient and reliable options to evaluate in 2025. These models offer impressive flow rates, energy efficiency, and advanced technology features that can greatly enhance your business operations. As you weigh your choices, you’ll want to understand the key factors that can influence your decision…
Rinnai CX199iN Condensing Smart Sense Tankless Water Heater
If you’re looking for a high-efficiency solution to meet your hot water needs, the Rinnai CX199iN Condensing Smart Sense Tankless Water Heater might just be your perfect match. With a powerful BTU rating of 199,000 and a flow rate of 11.1 GPM, this unit delivers consistent hot water. Its impressive thermal efficiency of 97% guarantees you’re maximizing energy use. You can install it indoors or outdoors, depending on your needs, and enjoy smart features like Bluetooth connectivity for easy management. Plus, with a stellar 4.9-star rating from customers, you can trust its reliability and performance in your home.
Best For: Homeowners or businesses seeking an efficient, high-capacity tankless water heater with smart technology for optimal hot water management.
Pros:
- High Efficiency: With a thermal efficiency of 97% and an efficiency rating of 96%, it maximizes energy use.
- Smart Features: Bluetooth connectivity allows for easy setup and management through the Rinnai Central App.
- Flexible Installation: Can be installed indoors or outdoors, providing versatility for various spaces.
Cons:
- Initial Cost: Higher upfront investment compared to traditional tank water heaters.
- Weight: At 59.8 pounds, it may require professional installation for some users.
- Venting Requirements: Outdoor installation necessitates an additional RX-OVC vent cap, which may add to installation costs.
Rheem 18kW 240V Tankless Electric Water Heater, Gray
The Rheem 18kW 240V Tankless Electric Water Heater is an ideal choice for homeowners seeking efficient and space-saving solutions for their hot water needs. With a flow rate of up to 4.4 GPM and a maximum temperature of 140°F, this heater delivers reliable performance. Its self-modulation technology adjusts power based on demand, potentially saving you up to 50% on water heating bills. Weighing only 14.78 pounds and taking up 90% less space than traditional tanks, it mounts easily on walls. Plus, the external digital thermostat guarantees precise temperature control, making it a smart addition to any home.
Best For: Homeowners looking for an efficient, space-saving hot water solution that adjusts to their usage needs.
Pros:
- Energy Efficient: With a 99.8% efficiency rating and self-modulation technology, it can save up to 50% on water heating bills.
- Compact Design: At 90% smaller than traditional tank heaters, it is ideal for homes with limited space.
- Easy Installation and Control: The wall-mounted design and external digital thermostat make it simple to install and operate.
Cons:
- Limited Flow Rate: The maximum flow rate of 4.4 GPM may not be sufficient for larger households with high hot water demands.
- Electric Dependency: Requires a reliable electricity source, which may be a concern in areas with frequent power outages.
- Initial Cost: The upfront cost may be higher compared to traditional tank water heaters.
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
For homeowners seeking a reliable and efficient hot water solution, the Rheem RTEX-24 24kW 240V Electric Tankless Water Heater stands out with its impressive flow rate of 5.9 gallons per minute. This compact, wall-mounted unit offers a maximum temperature of 140 degrees Fahrenheit and boasts an efficiency of 99.8%. With adjustable controls and a digital temperature display, you can easily set your desired heat. Installation requires professional help and a 200 AMP service, ensuring it meets your home’s electrical needs. Plus, the 30-day return policy and strong customer ratings make this heater a smart choice for any household.
Best For: Homeowners looking for an efficient and space-saving hot water solution for their entire household.
Pros:
- Compact design, up to 93% smaller than traditional water heaters, allowing for easy installation in tight spaces.
- High efficiency rating of 99.8%, reducing energy costs and environmental impact.
- Adjustable temperature settings with a digital display for precise control of hot water.
Cons:
- Requires professional installation and a 200 AMP service, which may incur additional costs.
- Performance can be affected by ground water temperature, potentially limiting effectiveness in colder climates.
- Limited to a maximum flow rate of 5.9 gallons per minute, which may not be sufficient for larger households with high hot water demands.
Westinghouse Natural Gas Tankless Water Heater (Max 5.1 GPM, 120,000 BTU)
With a maximum flow rate of 5.1 gallons per minute, the Westinghouse Natural Gas Tankless Water Heater is an ideal choice for homeowners or businesses seeking efficient hot water solutions. Boasting 120,000 BTUs, its on-demand operation not only saves energy but also cuts costs. This unit maintains temperature within ±1°F, ensuring consistent comfort for 2-4 fixtures simultaneously. You’ll appreciate the WiFi-enabled smartphone control and LED display for easy monitoring. CSA-certified for safety, it features a variable-speed fan and freeze protection. Installation’s a breeze with standard connections, but professional help is recommended for best performance. Enjoy reliable hot water all year round!
Best For: The Westinghouse Natural Gas Tankless Water Heater is best for homeowners and businesses looking for an efficient and reliable hot water solution that can handle multiple fixtures simultaneously.
Pros:
- Energy-efficient with on-demand operation, reducing costs.
- WiFi-enabled for convenient smartphone control and monitoring.
- CSA-certified for safety with features like freeze protection and a variable-speed fan.
Cons:
- Professional installation is recommended, which can add to initial costs.
- Indoor installation only may limit placement options in some homes.
- Requires a connection to a 120V AC power source, which may not be readily available in all locations.
Rinnai RX160iN Condensing Tankless Water Heater
When you’re looking for a reliable and efficient water heating solution, the Rinnai RX160iN Condensing Tankless Water Heater stands out as an excellent choice for homeowners. With a compact design similar to a small suitcase, it delivers up to 9 GPM, easily supporting six fixtures at once. You can install it indoors or outdoors, using natural gas or propane. Its modern interface and Quick Flush feature simplify maintenance. Professional installation is recommended, and you can use the Rinnai Central App for setup and troubleshooting. Plus, enjoy high energy efficiency with a UEF of .97, making it a smart investment.
Best For: Homeowners seeking an efficient and compact tankless water heating solution that can support multiple fixtures simultaneously.
Pros:
- High energy efficiency with a UEF of .97, reducing energy costs.
- Compact design allows for flexible installation in various spaces.
- Quick Flush maintenance feature simplifies upkeep and enhances longevity.
Cons:
- Professional installation is required, which may increase initial costs.
- WiFi control requires an additional Controlr module that is not included.
- Limited to natural gas or propane, excluding electric options.
EcoSmart ECO 11 Electric Tankless Water Heater
The EcoSmart ECO 11 Electric Tankless Water Heater stands out as the perfect choice for those in need of efficient, on-demand hot water solutions for smaller spaces. With a compact design of just 11.5 x 8 x 3.75 inches, it’s 90% smaller than traditional tank heaters. This unit boasts 99% thermal energy efficiency, providing endless hot water without running out. It maintains a consistent temperature within 1°F of your selected setting and supports various applications, from bathrooms to office breakrooms. Plus, its lifetime warranty on electronics guarantees peace of mind for your investment. Enjoy reliable hot water tailored to your needs!
Best For: Those seeking an efficient, compact water heating solution for smaller spaces and low-flow applications.
Pros:
- Compact size: 90% smaller than traditional tank heaters, making it ideal for limited spaces.
- Endless hot water: Provides on-demand hot water without running out, perfect for multiple uses.
- High efficiency: With 99% thermal energy efficiency, it heats water only when needed, saving on energy costs.
Cons:
- Flow rate limitations: Maximum flow rate of 3.1 gallons per minute may not suffice for larger households or simultaneous use.
- Requires specific climate: Best suited for climates with incoming water temperatures of 67°F and above.
- Higher amperage draw: Amperage requirements may necessitate electrical upgrades in some homes.
Westinghouse Natural Gas Tankless Water Heater (Max 7.9 GPM, 180,000 BTU)
For homeowners seeking efficient and reliable hot water solutions, the Westinghouse Natural Gas Tankless Water Heater stands out with its impressive maximum flow rate of 7.9 gallons per minute (GPM). This unit operates only when needed, helping you save on energy costs. With a powerful 180,000 BTU output, it can supply hot water to 3-5 fixtures simultaneously, maintaining a precise temperature within ±1°F. The CSA-certified heater features WiFi connectivity for easy adjustments and monitoring. Its durable design includes a freeze protection system, ensuring longevity. Plus, with a 2-year full warranty, you can trust its performance for years to come.
Best For: Homeowners and businesses looking for an energy-efficient, on-demand hot water solution that can support multiple fixtures simultaneously.
Pros:
- High efficiency with a maximum flow rate of 7.9 GPM, suitable for multiple simultaneous uses.
- WiFi enabled for convenient monitoring and temperature adjustments via a smartphone app.
- CSA-certified for safety, with a durable design that includes freeze protection.
Cons:
- Professional installation is recommended, which may incur additional costs.
- Requires a connection to a power source, limiting installation options.
- The initial investment may be higher compared to traditional tank water heaters.
Westinghouse Tankless Water Heater (Propane, 120,000 BTU)
Looking for an efficient solution to provide hot water for multiple fixtures at once? The Westinghouse Tankless Water Heater (Propane, 120,000 BTU) is your answer. With a max flow rate of 5.1 GPM, it delivers hot water to 2-4 fixtures simultaneously, ensuring everyone stays satisfied. Its on-demand efficiency saves energy and costs, while the ±1°F temperature control keeps water stable. Designed for outdoor installation, it’s CSA-certified for safety and features freeze protection. Weighing 37.1 pounds and wall-mounted, it fits snugly in any space. Enjoy a 2-year warranty on the unit and a 5-year warranty on the heat exchanger.
Best For: Those seeking a reliable and efficient hot water solution for multiple fixtures in outdoor settings.
Pros:
- High flow rate of 5.1 GPM allows simultaneous use for 2-4 fixtures.
- On-demand efficiency reduces energy costs and waste.
- Compact and wall-mounted design saves space and is easy to install.
Cons:
- Designed for outdoor installation, limiting placement options.
- Requires a 120V AC power connection, which may necessitate additional electrical work.
- Batteries for the remote control panel are not included, adding to initial setup costs.
FOGATTI Natural Gas Tankless Water Heater Outdoor – Instagas Comfort 180S Series
If you’re seeking an efficient solution for on-demand hot water, the FOGATTI Natural Gas Tankless Water Heater Outdoor – Instagas Comfort 180S Series stands out with its impressive flow rate of up to 8.1 GPM. This compact unit delivers continuous hot water, perfect for multiple outlets like showers and sinks. With precision temperature control and a four-stage combustion system, you’ll enjoy consistent comfort regardless of the climate. Designed for outdoor durability, it includes safety features like a bottom-mounted fan to prevent smoke backflow. Plus, its quick installation makes it an ideal choice for your home’s hot water needs.
Best For: Homeowners seeking a reliable, efficient solution for on-demand hot water delivery in outdoor settings.
Pros:
- High flow rate of up to 8.1 GPM, suitable for multiple outlets simultaneously.
- Advanced temperature control technology maintains consistent hot water temperature.
- Designed for outdoor durability with essential safety features for enhanced longevity.
Cons:
- Requires outdoor installation, which may limit placement options.
- Needs a compatible low water pressure range (15-150 PSI) for optimal performance.
- The active heating anti-freeze device requires draining in extreme cold temperatures (below 5℉).
Rinnai CU160iN Commercial Natural Gas Condensing Tankless Water Heater
The Rinnai CU160iN Commercial Natural Gas Condensing Tankless Water Heater stands out with its impressive flow rate of 9 gallons per minute, making it an excellent choice for businesses like restaurants and educational institutions that require consistent access to hot water. Its energy-efficient design heats water only when needed, while Circ-Logic Technology optimizes hot water availability based on your usage patterns. The wall-mounted unit is compact, saving space without sacrificing performance. Plus, Wi-Fi monitoring adds convenience by allowing on-demand hot water. With an 8-year warranty on the heat exchanger, you’ll enjoy reliable performance for years to come.
Best For: The Rinnai CU160iN is best for restaurants, educational institutions, and multi-family residential buildings that require a reliable and efficient hot water supply.
Pros:
- Energy-efficient: Heats water only when needed, reducing energy costs.
- High flow rate: Delivers 9 GPM, ensuring sufficient hot water for high-demand applications.
- Advanced technology: Features Circ-Logic Technology and Wi-Fi monitoring for optimal convenience and performance.
Cons:
- Professional installation required: May incur additional costs for installation by a qualified technician.
- Wall-mounted only: Limited to installation in locations suitable for wall mounting.
- Weight: At 72.3 pounds, it may require more than one person for installation.
Factors to Consider When Choosing Commercial Tankless Water Heaters
When you’re choosing a commercial tankless water heater, consider several key factors to guarantee it meets your needs. You’ll want to evaluate flow rate requirements, energy efficiency ratings, and installation flexibility options. Don’t forget to think about fuel type and your maintenance support needs as well.
Flow Rate Requirements
Choosing the right flow rate for your commercial tankless water heater is essential to secure a steady supply of hot water for your business. The flow rate, measured in gallons per minute (GPM), determines how much hot water can be delivered simultaneously. For commercial use, you’ll need a system that supports multiple fixtures, like kitchens and restrooms. Typical flow rates range from 5 GPM to over 11 GPM, so assess your peak demand during busy hours. To avoid issues like temperature fluctuations, select a heater with a higher flow rate than your maximum expected demand. Calculate the total GPM needed by adding the flow rates of all fixtures that might be used at the same time to guarantee efficient operation.
Energy Efficiency Ratings
Selecting the right flow rate for your commercial tankless water heater guarantees you meet peak demand, but energy efficiency ratings also play an important role in your decision-making process. These ratings, often expressed as a percentage or UEF (Uniform Energy Factor), show how effectively a unit converts energy into hot water. Higher ratings indicate better efficiency and lower energy costs. Many models boast thermal efficiency ratings above 90%, with some reaching 99.8%, minimizing energy waste. Factors like incoming water temperature and desired output can impact efficiency. Condensing tankless heaters improve energy efficiency by using exhaust gases to preheat incoming water. Remember, proper sizing and installation are vital to achieving ideal performance and preventing unnecessary energy expenditure.
Installation Flexibility Options
As you explore options for commercial tankless water heaters, you’ll find that installation flexibility is an essential factor to take into account. Many models allow for both indoor and outdoor setups, so you can choose what fits your space best. Advanced venting options make it easy to convert from indoor to outdoor installations, enhancing your placement choices. Some units even come with conversion kits for recirculation systems, boosting hot water management and efficiency. Their compact design allows for mounting in tight spaces, such as utility rooms or under sinks, maximizing available space. While DIY might be tempting, professional installation is often recommended to guarantee peak performance and compliance with local codes, ensuring safe and efficient operation.
Fuel Type Considerations
When exploring commercial tankless water heaters, fuel type plays a pivotal role in your decision-making process. You can choose from natural gas, propane, or electricity, each offering unique benefits. Natural gas and propane models usually deliver higher BTU ratings, making them ideal for situations where multiple fixtures need hot water simultaneously. On the other hand, electric tankless units often achieve energy efficiency ratings as high as 99.8%, which can save you money in the long run. Also, consider installation costs: natural gas and propane units require venting, while electric ones don’t. Finally, evaluate the availability and cost of each fuel source in your area, as this will impact your operational expenses and system efficiency.
Maintenance and Support Needs
Understanding maintenance and support needs is vital for guaranteeing the longevity and efficiency of your commercial tankless water heater. Regular maintenance is key, and features like quick flush systems make this process easier. Look for models with smart features that enable remote monitoring, allowing you to receive timely maintenance alerts. A solid warranty covering components such as heat exchangers for 5-8 years can help minimize long-term costs and provide peace of mind in case of failures. Access to robust customer support and installation resources is essential for maintaining reliability. Make sure you have installation guides and professional servicing options available to keep your system running efficiently and address any operational issues as they arise.
Size and Space Constraints
How do you choose the right size for a commercial tankless water heater? Start by reviewing the dimensions of the unit. Some models are compact and fit in tight spaces, while others need more room for installation and maintenance. Consider the flow rate, measured in gallons per minute (GPM); a higher flow rate allows for simultaneous use across multiple fixtures, so choose a size that meets your space’s hot water demands. Space constraints will also influence whether you go for indoor or outdoor installation. Make sure the unit’s weight is manageable for your location—heavier units may require additional support. Finally, evaluate your plumbing layout to optimize hot water delivery and reduce heat loss.
