DIAPHRAGM

ELECTRODE

EXPANSION VESSEL

FAN 

FLOW

FLOW REGULATER 

FLOWSWITCH

FUSE

Gas valve

GAUGE 

GOVERNOR

HEAT EXCHANGER

IGNITOR

INJECTOR 

KNOB

LAMP

LEAD 

MICROSWITCH

MOTOR 

PCB 

PILOT 

POTENTIOMETER

PRESSURE GAUGE

PRESSURE SWITCH

PROBE 

PRV

PUMP  

 RELAY

RESISTOR

SENSOR

THERMOCOUPLE 

 THERMOSTAT

TRANSFORMER 

VALVE

WASHER

LIGHT