Product Information - Navien NCB-700-2S+/42K Service Manual

2. Product Information

2.1 Product Information
The NCB700 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: 40.6 kW and 52 kW.
Model
NCB700-2S+/42K
NCB700-3S/54K
By default, the boiler assigns system priority to DHW supply.
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The NCB700 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.
12 Product Information
Maximum Space Heating Input
350 kW
35.0 kW
Maximum DHW INPUT
40.6 kW
52.0 kW