MRCOOL Natural Gas Tankless Water Heater | MHWH199NCNU


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Unlike traditional water heaters, the MRCOOL Natural Gas Tankless Water Heater provides neverending hot water to up to four bathrooms and multiple home appliances simultaneously. With a high volume and flow rate, this tankless heater is highly efficient while still being environmentally friendly. This compact and space-saving heater has a much longer lifespan thanks to the stainless steel, corrosion resistant engineering. This design has four times the corrosion resistance of copper and is lead free. One of the many high tech features of this unit is the electronic thermostatic PCB, which provides intelligent temperature control and gas flow that is automatically controlled. The EDM BLDC variable-speed fan provides stable combustion along with a smooth air flow transition. The combustion chamber is surrounded by water tubes making it a thermal insulator also. The environmentally-friendly premixed burner gives a reduction of NOx emissions, lowers the flame temperature, and reduces port-loading. You can experience the most comfortable shower experience thanks to the self-adapting temperature regulation. A large touch-screen display provides helpful information to you and your plumber about the heaters operation. This unit must be installed by a professional and offers a 15-year heat exchanger warranty, a 5-year parts warranty, and a 5-year labor warranty. This MRCOOL Natural Gas Tankless Water Heater will replace your old water heater and provide efficiency and effectiveness.


  • Meets SCAQMD Standards
  • UNSPSC: 52141700
  • Not mobile home compatible
  • Min Temp: 95 F / Max Temp: 140 F
  • Wattage: 150 W (+114 W when anti-freeze module is on)
  • Maximum Gallons per Minute: 8.45g/min
  • Flow Rate @ 35°F Rise (gallons/min): 11.12
  • Flow Rate @ 45°F Rise (gallons/min): 8.45
  • Flow Rate @ 55°F Rise (gallons/min): 6.8
  • Flow Rate @ 65°F Rise (gallons/min): 5.8
  • 92% Uniform Energy Factor (UEF)
  • PSI: 7-140


    Dimensions 26.78"H x 17.33"W x 11.03"D
    Weight 68.34 lbs
    Condenser Weight Heat Exchanger Weight: 24.03 lbs
    Heating Capacity 199000 BTU
    Fuel Type natural gas
    Voltage 120V
    Cycle 60Hz
    Color White
    Number of Burners 1
    Min Ambient Heat Hot water outlet: NPT3/4in
    Drain Connection Size Cold water inlet: NPT3/4in
    Gas Connection Size Gas inlet: NPT3/4in
    Ignition Type Electric Ignition
    Vent Connector 2 in. or 3 in. or concentric
    Overload Protection Freeze Protection: Yes
    WiFi Compatibility no
    App Compatibility no
    CSA Listed yes
    CSA Certified yes
    Energy Star Certified No
    Base Warranty 5 year service
    Base Parts Warranty 5 year parts
    Base Heat Exchanger Warranty 15 year heat exchanger
    Proposition 65 Warning yes
    Gross Depth 13.74in
    Gross Height 33.22in
    Gross Width 20.27in
    Gross Weight 73.85 lbs


  • Brochure
  • Install Manual
  • Warranty Doc

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