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Today's Hours 8am - 11pm estMRCOOL High Efficiency 11.1 GPM Indoor Natural Gas Tankless Water Heater – 199,000 BTU, 120v
In Stock - Ready to Ship
By
MRCOOL
In stock
Model
MHWH199NCNU
ID
236804
Was $1,911.25 Your Low Price Special Price $1,529.00
Product Features
- High Output: Supports multiple fixtures.
- ENERGY STAR®: Helps reduce energy costs.
- Endless Hot Water: Up to 11.1 GPM on demand.
- Compact Design: Frees up valuable space.
- Digital Controls: Easy front-mounted temperature control.
- Included: Isolation Valves for easy installation.
OVERVIEW
The MRCOOL Natural Gas Tankless Water Heater (MHWH199NCNU) is a high-capacity, ultra-efficient on-demand water heating solution designed to deliver continuous hot water, exceptional energy savings, and long-term reliability for modern residential applications. Built for households that demand strong performance and uninterrupted comfort, this 199,000 BTU system eliminates the limitations of traditional storage tanks by heating water instantly as it flows through the unit. Engineered for larger homes with higher hot water demand, this natural gas tankless water heater is capable of supporting up to four bathrooms and multiple simultaneous fixtures, making it an ideal solution for families who need consistent performance throughout the day. Whether it’s multiple showers running at once, laundry cycles, dishwashing, or kitchen use, the system maintains stable temperature output without fluctuation or recovery delays.
Key Features
- 199,000 BTU High-Efficiency Natural Gas Burner: Delivers powerful on-demand heating for whole-home hot water needs.
- Endless On-Demand Hot Water Supply: Heats water instantly without requiring a storage tank.
- Supports Up to Four Bathrooms: Handles multiple fixtures and simultaneous household usage.
- Stainless Steel Corrosion-Resistant Heat Exchanger: Ensures durability, efficiency, and long service life.
- Electronic Thermostatic Control System: Maintains precise and stable water temperature output.
- Variable-Speed EDM BLDC Fan: Optimizes airflow for efficient and stable combustion.
- Ultra Low-NOx: Low-NOx burner technology helps reduce emissions.
- Compact Wall-Mounted Design: Saves space and allows flexible installation in tight areas.
What's Included in the Box
- Tankless Water Heater
- Isolation Valve Kit
- Gas Shut-Off Valve
- Wall-Mounting Kit (Upper/Lower Brackets and Screws)
- Two Bird Screens
- Flue Gas Flow Limiting Ring (For 3-Inch Vent Piping)
- Silicone Sealant
- Physical User's & Installation Manual
What Is an Isolation Valve Kit?
An isolation valve kit is an important accessory used during tankless water heater installation. These valves connect to the hot and cold water lines and allow the water heater to be shut off, serviced, flushed, or descaled without turning off water to the entire home.
Isolation valves are especially important for tankless water heaters because regular maintenance helps protect performance and efficiency. Over time, mineral buildup can collect inside the heat exchanger, especially in areas with hard water. Isolation valves make it much easier for a plumber or homeowner to flush the system and help extend the life of the unit.
Warranty Information
The MRCOOL Tankless Water Heater is backed by a comprehensive warranty package designed to provide long-term confidence and peace of mind. The unit includes a 15-Year Limited Heat Exchanger Warranty, a 5-Year Parts Warranty, and a 5-Year Limited Labor Warranty, helping protect your investment against manufacturing defects and covered component failures. This extensive coverage reflects MRCOOL's commitment to durability, reliability, and dependable hot water performance for years to come.
Refer to the manufacturer's manual for full warranty details.High-Efficiency Water Heater System for Whole-Home Performance
At the core of the MHWH199NCNU is a powerful 199,000 BTU high-efficiency natural gas burner system, designed to maximize heat output while minimizing fuel waste. This advanced combustion technology improves overall energy efficiency while delivering strong, reliable hot water performance. Unlike conventional tank heaters that repeatedly reheat stored water, this system only operates when needed—significantly reducing standby energy loss. The unit features a corrosion-resistant stainless steel heat exchanger, engineered for durability, thermal efficiency, and long service life. This component ensures consistent heat transfer while resisting mineral buildup and corrosion, helping maintain performance over years of operation. Smart control technology is integrated throughout the system, including an electronic thermostatic PCB (printed circuit board) that precisely regulates gas flow and water temperature. This intelligent system continuously adjusts output to maintain consistent comfort even when water demand changes across multiple fixtures.
Despite its high performance, the MRCOOL tankless system features a compact, wall-mounted design, freeing up valuable floor space compared to bulky tank water heaters. This makes it especially useful in modern homes, utility rooms, and tight mechanical spaces where efficiency and space savings matter. Built-in anti-freeze protection helps safeguard internal components in cold environments, ensuring reliable operation year-round. Combined with its advanced engineering, durable construction, and intelligent controls, this system delivers a premium hot water solution designed for long-term residential use.
Why Choose the MRCOOL Tankless Water Heater
- Unlimited Hot Water Supply: Provides continuous hot water, even during peak household demand.
- High Energy Efficiency: Heats water only when needed to reduce standby energy loss.
- Powerful Whole-Home Performance: Supports multiple bathrooms, fixtures, and appliances simultaneously.
- Space-Saving Design: Wall-mounted installation helps free up valuable floor space.
- Long-Term Durability: Stainless steel components resist corrosion and help extend service life.
- Consistent Temperature Control: Smart electronics help maintain stable water temperatures.
- Ultra Low-NOx Burner: Helps reduce emissions while meeting stringent air quality standards.
- Modern Upgrade from Tank Systems: Delivers improved efficiency, convenience, and overall performance.
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Why Choose MRCOOL?
MRCOOL mini split systems combine innovative design with advanced manufacturing to deliver efficient, reliable comfort wherever you need it. Built with cutting-edge technology, these systems ensure optimal performance and flexibility for any space.