Navien NCB300-28K, Service Manual

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Product Information 11
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 Maximum Space Heating Input Maximum DHW INPUT
NCB300-28K 24.7 kW 28.0 kW
NCB300-37K 26.8 kW 37.0 kW
NCB300-41K 26.8 kW 41.0 kW
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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
valve (or relief valve). A separate additional heating expansion vessel may be required depending on size of the whole system.
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Internal freeze protection and an electronic control unit are incorporated inside the boiler. The boiler is compatible with all brands of
standalone room thermostats and various sets of relay contacts can be used with the boiler.
2. Product Information