14 About the Boiler
1.6 Rating Plate
The Navien NCB-H boilers come from the factory configured for use with Natural Gas (NG). Before starting
the installation, check the rating plate located on the side of the boiler to ensure that the boiler matches the
gas type, gas pressure, water pressure, and electrical supply available in the installation location. If the boiler
does not match each of these ratings, do not install the boiler. If conversion to Propane Gas is required, the
included gas conversion kit must be used. Refer to “12.1 Gas & High Altitude Conversion” on page 123 for details.
WARNING
Ensure that the gas type and power source specifications match what is listed on the rating plate. Using a
different gas type will cause abnormal combustion and boiler malfunction. Using abnormally high or low AC
voltage may cause abnormal operation, and may reduce the life expectancy of the product.
This appliance complies with the requirements of SCAQMD Rule 1146.2 for NOx emissions of 14 ng/J or 20 ppm
at 3% O
2
.
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