Source from Objects
Continuously generates smoke, fire, or liquid from an object in a container.
This tool can be applied, for example, to objects such as taps or candle wicks as it creates a continuous flow of fluid. Keep in mind, this tool generates volume based fluid, as opposed to the 
Emit Particle Fluid tool which generates particle based fluid.
Using Source from Objects
Create a geometry object within a container.
For more information on containers see:
Smoke Container, 
Fire Container, and 
Liquid Container.Click the
Source from Objects button on the Fluids tab.Select the geometry object to generate the source and press Enter to confirm your selection.
Select the container to put the source into and press Enter to confirm your selection.
This tool is different than using 
Smoke from Object, 
Burst into Flame, and 
Liquid from Object because it emits fluid continuously. It also useful as it allows you to create and simulate multiple objects in the container, whereas the other tools set the initial conditions from one object.
If the object is only partially in the container, only the portion of the object that is in the container’s boundaries will be simulated.
This tool is similar to 
Sink from Objects and 
Pump from Objects as it converts a geometry object into a dynamic object with a 
Merge node that has a default Relationship. Changing the Relationship field in the merge node will change the action of the tool. For example, you can change a Sink from Object to a Source from Object by changing the Relationship from Sink Relationship to Source Relationship in the drop-down menu.
You can control the behavior of the fluid by editing the parameters of the fluid object. For more information on editing specific parameters, see the 
Smoke Object and 
Fluid Object node help.
Note
Fire and smoke are both created by the