Product Information - Navien NCB300-28K Service Manual

2. Product Information

2.1 Product Information
The NCB300 series gas boiler is a fully modulating gas appliance which has a built-in circulation pump and air vent. It provides central
heating and domestic hot water. Depending on the heat capacity, two models are available with different ratings: 28 kW, 37 kW, and 41 kW.
Model
NCB300-28K
NCB300-37K
NCB300-41K
By default, the boiler assigns system priority to DHW supply.
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The NCB300 Series boiler has a built-in circulation pump, 3-way valve assembly, flow sensor, DHW plate heat exchanger and, a safety
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valve (or relief valve). A separate additional heating expansion vessel may be required depending on size of the whole system.
Internal freeze protection and an electronic control unit are incorporated inside the boiler. The boiler is compatible with all brands of
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standalone room thermostats and various sets of relay contacts can be used with the boiler.
Maximum Space Heating Input
24.7 kW
26.8 kW
26.8 kW
Maximum DHW INPUT
28.0 kW
37.0 kW
41.0 kW
Product Information 11