These hot water regenerators contain four stages, with each connected to a plate heat exchanger, liquid distributor, wettable media and solution sump. The plate heat exchanger heats the liquid desiccant by exchanging heat with the hot water or steam supply.

Dilute desiccant from the Dehumidification module enters the end of first stage of the regenerator where it is pumped through the heat exchanger for heat gain and distributed over the media (pad). In contact with an air stream, moisture from the now high temperature dilute desiccant will evaporate quickly and be removed together with latent heat by the air flow. The stronger desiccant collects in the solution sump and migrates to the next stage. The process is repeated in each stage providing for an ever-increasing desiccant concentration that is returned to the Dehumidification module.