In some designs, the ware is left in one place, while the heating zone moves across it.

More elaborate tube furnaces have two (or more) heating zones useful for transport experiments.

The liquid is pumped to a heating zone, where it is heated to supercritical conditions.

Which means the house has to be cold, because the Koroleski farmhouse has just one heating zone.

Generally there are several heating zones followed by one or more cooling zones.

For example, in a house, the main floor may be served by one heating zone while the upstairs bedrooms are served by another.

Another advantage is that more than one unit may be used to supply separate heating zones or multiple bathrooms, giving greater time and temperature control.

Induction cookers are easy to clean because the cooking surface is flat and smooth, even though it may have several heating zones.

Bleeder valves are in each heating zone, but I don't know how to eliminate the trapped air, nor whether this will cure the problem.

The reported number of heating zones is the same as the number of oven conveyor speed.