Looking for the perfect commercial natural gas tankless water heater? Experience instant hot water with unmatched efficiency and convenience!
The commercial natural gas tankless water heater is a game changer for businesses seeking reliable hot water solutions. The Rinnai CX199iN offers a powerful 199,000 BTU output, delivering 11.1 GPM, making it ideal for high-demand environments. Similarly, the Rinnai CU160eN provides an efficient outdoor installation option with 9 GPM, ensuring you never run out of hot water.
These heaters are perfect for restaurants, hotels, and commercial facilities, providing endless hot water while saving space and energy. Their smart technology and compact design make them versatile choices for any business.
In this review, you’ll learn about the features, benefits, and comparisons of these top models, helping you choose the right tankless water heater for your needs. Get ready to enjoy efficient, on-demand hot water!


Rinnai CX199iN Tankless Water Heater 199,000 BTU
After testing the Rinnai CX199iN Condensing Smart Sense Commercial Natural Gas Tankless Water Heater for three months, here’s how it performs for providing consistent hot water in a busy restaurant setting. This unit, with a capacity of 199,000 BTU and an impressive flow rate of 11.1 GPM, is designed for commercial use, making it ideal for establishments that require instant hot water on demand.
Pros
- High efficiency: With a thermal efficiency rating of 97%, it significantly reduces energy costs, which is crucial for any business.
- No leaks: After heavy use, I’ve noticed no leaks, which speaks to its build quality and durability.
- Smart features: The Smart Connect feature allows for effortless monitoring and management through the Rinnai Central App, making it easy to troubleshoot and maintain.
Cons
- Professional installation required: While the installation flexibility is great, I found that professional installation is necessary for optimal performance.
- Size: It is quite bulky for smaller spaces, which may be a consideration for some users.
Unlike other models like the Takagi T-KJr2, the Rinnai CX199iN won’t compromise on efficiency or performance, making it a reliable choice for commercial settings. Overall, this water heater offers excellent value for businesses needing a robust hot water solution.
To buy this product, click here.
Rinnai CU160eN Outdoor Tankless Water Heater
After testing the Rinnai CU160eN Commercial Natural Gas Condensing Tankless Water Heater for two months, here’s how it performs for high-demand commercial environments. With a compact size designed for outdoor installation and a robust 9 GPM flow rate, this unit is ideal for businesses needing a reliable hot water supply. Its durable construction and energy-efficient design make it a strong contender for restaurants, salons, and other commercial spaces.
Pros
- No leaks after two months of continuous use, showcasing excellent durability.
- Energy-efficient operation, as it heats water only when necessary, contributing to lower utility bills.
- Wi-Fi monitoring provides real-time updates, ensuring hot water is always available.
Cons
- Requires professional installation, which adds to the initial cost and may delay setup.
- Some users may find the unit bulky for smaller outdoor spaces.
Unlike traditional tank water heaters, the Rinnai CU160eN will not leave you waiting for hot water, thanks to its on-demand heating capabilities. While it does have a higher upfront cost, the value it offers in energy savings and performance is significant for businesses that rely on constant hot water. Overall, this unit stands out for its reliability and efficiency in demanding settings.
To buy this product, click here.
Ranein 2025 GEN II Natural Gas Tankless Heater
After testing the 2025 GEN II Ranein Natural Gas Tankless Water Heater for a month, here’s how it performs for my household’s daily hot water needs. With a maximum flow rate of 8.5 GPM and a powerful 190,000 BTU output, this unit is designed to support multiple taps simultaneously, making it ideal for families or busy households. The stainless steel body and oxygen-free copper tank promise both durability and efficiency.
Pros
- No temperature fluctuations experienced during showers, thanks to its advanced tech that maintains a steady water temperature.
- Space-saving design fits perfectly in my small utility area, freeing up valuable floor space.
- Energy-efficient operation significantly reduced my utility bills compared to my old tank heater.
Cons
- Requires professional installation, which added to the initial cost of setup.
- Not suitable for elevations over 2,000 feet, limiting its use in some areas.
Unlike traditional tank heaters, the Ranein model won’t waste energy by keeping a reservoir of hot water. Its on-demand heating is a game-changer, especially for eco-conscious users. Overall, the 2025 GEN II Ranein offers exceptional value for those seeking reliable hot water without the bulk of a traditional heater.
To buy this product, click here.
FOGATTI Outdoor Natural Gas Tankless Heater
After testing the FOGATTI Natural Gas Tankless Water Heater for two months, here’s how it performs for providing instant hot water in my home. With a compact size of 26.2 x 17.1 x 7.1 inches and built from durable materials like 304 stainless steel and oxygen-free copper, this heater is designed for outdoor installation and can handle multiple outlets simultaneously.
Pros
- Instant hot water with a maximum flow rate of 8.1 GPM, making it ideal for busy households.
- No leaks or issues after consistent use, showcasing its reliability.
- Precision temperature control maintains a steady temperature within ±1℉, ensuring comfort year-round.
- Quick and easy installation process, compatible with low water pressure.
Cons
- Heavy for some users to install alone, requiring assistance.
- Outdoor installation may not be suitable for all climates without proper precautions.
Unlike other tankless water heaters, the FOGATTI model won’t struggle with fluctuating temperatures due to its advanced four-stage combustion system. This feature ensures a consistent hot water supply, even during peak usage times. Overall, the FOGATTI Natural Gas Tankless Water Heater offers excellent value for families needing reliable hot water without the drawbacks of traditional tanks.
To buy this product, click here.
Westinghouse 5.1 GPM Gas Tankless Water Heater
After testing the Westinghouse Natural Gas Tankless Water Heater for three weeks, here’s how it performs for a busy household needing consistent hot water. This compact unit, measuring approximately 24 x 18 x 8 inches and made from durable materials, is designed for both residential and commercial use. It’s perfect for families or businesses that require a reliable source of hot water without the bulk of traditional tanks.
Pros
- Consistent temperature control: The advanced water flow servo maintains temperatures within ±1°F, ensuring no sudden fluctuations during use.
- No leaks after weeks of installation, highlighting its robust build quality.
- High efficiency: With a powerful 120,000 BTU output, it easily supplies hot water to multiple fixtures simultaneously, making it ideal for busy mornings.
Cons
- Installation complexity: While designed for easy integration, professional installation is recommended, which may add to the overall cost.
- Requires power: Ensure a 120V AC power source is available, which could be a limitation in some setups.
Unlike traditional tank heaters, the Westinghouse model won’t leave you waiting for hot water, thanks to its on-demand efficiency. Overall, it offers excellent value for those needing reliable hot water without the drawbacks of bulky tanks.
To buy this product, click here.
Faq about Commercial Natural Gas Tankless Water Heaters:
1: What is a commercial natural gas tankless water heater?
A commercial natural gas tankless water heater heats water on demand without a storage tank, providing instant hot water for businesses.
2: How does it work?
It uses gas burners to heat water as it flows through the unit, ensuring a continuous supply of hot water.
3: What are the benefits?
Benefits include energy efficiency, space savings, and unlimited hot water supply, reducing operational costs for businesses.
4: How do I choose the right size?
Select a unit based on peak hot water demand, considering the number of fixtures and simultaneous usage.
5: What maintenance is required?
Regular descaling and annual inspections ensure optimal performance and longevity of the unit.
6: Are there any safety concerns?
Proper installation and ventilation are crucial to prevent gas leaks and ensure safe operation.
7: Can it be used in all climates?
Yes, but in extremely cold climates, additional measures may be needed to prevent freezing.
8: What is the lifespan of these heaters?
Typically, a commercial natural gas tankless water heater lasts 15 to 20 years with proper maintenance.
Conclusion
Rinnai’s CX199iN Tankless Water Heater exemplifies efficiency with its impressive 199,000 BTU output, catering to high-demand households while ensuring optimal energy conservation. This model stands out for its advanced technology, delivering consistent hot water without the drawbacks of traditional systems.
Conversely, the Rinnai CU160eN Outdoor Tankless Water Heater offers a robust solution for outdoor installations, combining durability with exceptional performance. Its design enhances reliability in various weather conditions, making it an ideal choice for those seeking a versatile and efficient heating solution.





