MRCOOL® 199,000 BTU Natural Gas Tankless Water Heater – Indoor High-Efficiency On-Demand Hot Water System, Model- MHWH199NCNU

Product Description 

The MRCOOL® 199,000 BTU Natural Gas Tankless Water Heater delivers continuous, on-demand hot water for modern homes that demand performance, efficiency, and reliability. Designed for indoor installation, this high-capacity system can supply up to four bathrooms simultaneously, along with multiple household appliances—without temperature drops or recovery delays.

 

Unlike traditional tank water heaters that store and reheat water, this MRCOOL® tankless system heats water only when needed, significantly reducing energy waste while providing consistent hot water whenever you need it. Its lead-free stainless steel heat exchanger, offering four times the corrosion resistance of copper, ensures long service life, cleaner water flow, and dependable operation year after year.

 

KEY FEATURES & PERFORMANCE HIGHLIGHTS

• 199,000 BTU heating capacity

• Natural gas fuel type

• Indoor installation design

• Supports up to 4 bathrooms at once

• 92% Uniform Energy Factor (UEF)

• Maximum flow rate up to 8.45 GPM

• Stainless steel, corrosion-resistant heat exchanger

• Eco-friendly premixed burner with low NOx emissions

• Electronic thermostatic PCB for intelligent gas & temperature control

• EDM BLDC variable-speed fan for stable combustion

• Self-adapting temperature regulation

• Built-in freeze protection

• Large touchscreen display for diagnostics & maintenance

• CSA listed & certified

 

HOT WATER PERFORMANCE 

Temperature Rise	Flow Rate
35°F Rise	11.12 GPM
45°F Rise	8.45 GPM
55°F Rise	6.8 GPM
65°F Rise	5.8 GPM

.

Ideal for simultaneous showers, laundry, dishwashers, and sinks.

ELECTRICAL & GAS REQUIREMENTS

• Fuel Type: Natural Gas
• Voltage: 120V
• Frequency: 60 Hz
• Ignition: Electric
• Gas Inlet: ¾” NPT
• Water Connections: ¾” NPT
• Operating Pressure: 7–140 PSI
• Venting Options: 2”, 3”, or concentric

 

⚠️ Professional installation required

 

DIMENSIONS & WEIGHT

Unit Dimensions

• Width: 17.33 in
• Height: 26.78 in
• Depth: 11.03 in

 

Weight

• Net Weight: 68.34 lbs
• Gross Weight: 74 lbs

 

WHAT’S INCLUDED

✔ MRCOOL® 199,000 BTU Natural Gas Tankless Water Heater

✔ Integrated freeze protection

✔ Touchscreen control display

✔ Installation & operation manuals

 

WARRANTY COVERAGE

• 15-Year Heat Exchanger Warranty

• 5-Year Parts Warranty

• 5-Year Labor Warranty

Top-tier protection for long-term peace of mind.

 

FREQUENTLY ASKED QUESTIONS (FAQ)

How many bathrooms can this unit support?

Up to four bathrooms simultaneously, depending on usage and inlet water temperature.

 

Is this better than a tank water heater?

Yes. Tankless systems provide endless hot water, higher efficiency, and longer lifespan.

 

Is Wi-Fi included?

No. This model prioritizes performance and reliability with onboard controls.

 

Is this unit mobile-home approved?

No. This model is not approved for mobile home installation.

 

WHY BUY FROM MRCOOL DIRECT?

When you buy from MRCOOL Direct, you get:

✅ Authorized MRCOOL® dealer – warranty protected

✅ Factory-fresh equipment (no refurbished units)

✅ Fast U.S. shipping

✅ Real product support from HVAC specialists

✅ Financing options available

 

📞 Call us anytime: 615-553-8118

Family-owned • USA’s #1 MRCOOL® Authentication Dealer