NOVELTY - A compressor system for gas which normally operates on gas compression cycle but which also operates in drier regeneration cycle, comprises gas drier stage comprising desiccant bed located in-line with flow of gas passing through compressor during gas compression cycle; condenser located in-line with flow of gas passing through compressor; and temperature controller to control temperatures of desiccant bed and condenser which are inactive.    USE - The system is for gas which normally operates on a gas compression cycle but which also operates in a drier regeneration cycle (claimed). It relates to the compression of natural gas and/or hydrogen for use in vehicles propelled by such gases.    ADVANTAGE - The system addresses the convenient disposal of separated water; and minimizes the release of electromagnetic radiation during operation.    DETAILED DESCRIPTION - A compressor system for gas which normally operates on a gas compression cycle but which also operates in a drier regeneration cycle, comprises:    (a) a compressor driven by a motor, and having at least a first stage inlet through which passes a flow of gas being compressed from a gas supply inlet;    (b) a gas delivery outlet at the outlet of the compressor, for supplying gas to a delivery line;    (c) a gas drier stage comprising a desiccant bed located in-line with the flow of gas passing through the compressor during the gas compression cycle;    (d) a condenser also located in-line with the flow of gas passing through the compressor during the gas compression cycle which condenser, during the compression cycle, is normally inactive;    (e) temperature controller to control the temperatures of the desiccant bed and condenser which are, during the compression cycle, inactive but, upon entering into a regeneration cycle, such controller being actuatable to cause the desiccant bed to be heated and the condenser to be cooled; and    (f) a valve for switching the flow of gas from the delivery outlet to recirculate through the compressor, where, during the regeneration cycle arising from activation of the valve, gas trapped within the compressor, desiccant bed and condenser is redirected from the outlet of the compressor for circulation in a closed loop as a recirculating gas flow through the compressor, with at least a portion of such recirculating gas flow passing through the desiccant bed and condenser to permit water evolved from the desiccant bed to be carried by the recirculating gas to the condenser where it condenses due to the low temperature condition maintained within the condenser by the temperature controller.    DESCRIPTION OF DRAWING(S) - The figure is a pictorial representation of a gaseous fuel motor vehicle parked in a garage having a home refueling appliance.    Refueling appliance (1)    Delivery hose (2)    Supply hose (3)    Electrical cord. (4)