Abstract: An apparatus for dehumidification of gas by means of a moisture adsorbing medium arranged in relative thin layers separated by heating elements for heating the adsorbing medium during regeneration. The heating element preferably comprises a sheet material having a printed circuit thereon. The adsorbing medium may be arranged in a plurality of separate chambers defined in a common housing having an inlet for gas to be dehumidified and an outlet for dehumidified gas. In operation gas to be dehumidified flows from the gas inlet through the majority of the chambers and the adsorbing medium contained therein. A small fraction of dehumidified gas is directed from the outlet through the adsorbing medium in the remaining chamber or chambers towards the gas inlet, and the adsorbing medium in this chamber or these chambers is at the same time heated by the heating elements in order to regenerate the adsorbing medium.