Navien NHB H Series Installation And Operation Manual page 9

Ignition Transformer
Metal Fiber
Premix Burner
Mixing
Gas Guide
Igniter &
Flame Rod
Primary Heat
Exchanger
Secondary Heat
Exchanger
Fan & Motor
Air Pressure Sensor
(APS)
Dual Venturi
Gas Valve
Gas Connection
Space Heating Supply
Fitting
Space Heating
Condensate Trap
Return Fitting
About the Boiler 9