[LazyPup]

Let me begin by explaining the difference between the burner and the furnace as I am sure there are many others who dont know as well.

Although not technically precise, in common usage the Furnace is the entire package, The cabinet, which houses the combustion chamber,internal flue, Heat exchanger or plenum, the blower, and the control section. ( In its purest sense, the word furnace refers to the combustion chamber, refractory linings, fire grates, damnpers, flues and all components of the combustion process.)

For a solid fueled heating system the burner is the stokers, grates onwhich the wood or coal burn, and the dampers or fans required to insure a proper supply of combustion air..

For liquid or gaseous fuel systems (Natural Gas, Propane, heating Oil, Kerosene etc.) the burner refers to the fuel pumps, metering devices, pressure regulators, combustion air blowers or regulators and they safety devices to insure a proper combustion within the furnace.

For Electric Heat the burner refers to the electrical resistance heat strips used to generate the heat.

In most cases a humidifier is an optional feature, that may be in the air plenum of the heating unit housing, but is most often an add on that is built into the ductwork immediately after the furnace.

If you have what appears as a small add on unit on the ductwork and it has the word humidifier it most likely is an add on humidifier. If your furnace is equipped with the optional humidiifier it will have a water line attached to it and the water supply may be turned off.