Navien NCB700-42C Installation & Operation Manual page 13

Mixing Chamber
Single Venturi
Primary Heat Exchanger
Secondary Heat Exchanger
Air Pipe
3-Way Valve
Gas Valve
Return Adapter
Filter Assembly
Pressure Relief Valve
Central Heating Supply
Central Heating Return
DHW Outlet
DHW Inlet
NCB700-42C
12 About the Boiler