The MRCOOL® Natural Gas Tankless Water Heater (MHWH199NCNU) is designed to provide a continuous, energy-efficient supply of hot water for your home. Capable of supporting multiple appliances and up to four bathrooms, this tankless water heater delivers a high flow rate while saving space with its compact design. The corrosion-resistant stainless steel body enhances the durability of the unit and ensures clean water both in and out, offering four times the corrosion resistance of copper.

This heater is equipped with advanced features such as an electronic thermostatic PCB and a variable-speed EDM BLDC fan, which together improve efficiency and performance. The eco-friendly premixed burner reduces NOx emissions, while the smart self-adapting temperature regulation ensures a comfortable and accurate hot water experience. Additionally, the built-in anti-freeze protection keeps pipeline water at safe temperatures, even in cold climates. The large touch screen display allows easy monitoring and maintenance of the system, providing valuable information for both homeowners and service professionals.

This unit must be installed by a professional and is backed by a 15-year warranty on the heat exchanger, as well as a 5-year parts and service warranty.

Key Features:

High flow rate and efficiency, supporting up to four bathrooms and multiple appliances
Durable, corrosion-resistant stainless steel design for long-lasting performance
Flow rates: 10.7 GPM @ 35°F rise; 8.3 GPM @ 45°F rise; 6.8 GPM @ 55°F rise
Eco-friendly premixed burner reduces NOx emissions
Smart self-adapting temperature regulation for accurate comfort
Anti-freeze protection to maintain pipeline water temperature above 40°F
Compact and space-saving design
Must be installed by a professional
15-year heat exchanger warranty, 5-year parts and service warranty
Meets SCAQMD Standards, 92% Uniform Energy Factor (UEF)

Tankless Water Heaters

MRCOOL Liquid Propane Tankless Water Heater (MHWH199NCLU)

MRCOOL Natural Gas Tankless Water Heater (MHWH199NCNU)