Steam-based heating processes use latent heat and transfer it to a given product. When the work is done (i.e. steam has given up its latent heat), steam condenses and becomes condensate. In other words, condensate does not have the ability to do the work that steam does.
Subtransmission is part of an electric power transmission system that runs at relatively lower voltages. It is uneconomical to connect all distribution substations to the high main transmission voltage, because the equipment is larger and more expensive.
A hydrostatic transmission works through the use of a pump connected to a mover that drives a hydraulic motor. The motor, powered through the generation of flow, is connected to the load. This can be used to transmit power from the primary mover to the load itself. However, many types of hydrostatic transmissions also use variable distance pumps or motors. This allows for the regulation of torque and power.