NOVELTY - Electrochemical cell, i.e. electrolyzer or pump, comprises an anode comprising a hydrogen-carrying fluid or water feed chamber, a cathode comprising a hydrogen product chamber, and a high-temperature low-hydration membrane between the anode and cathode. The anode and cathode are electrically coupled to an electric current source for powering the electrochemical cell.    USE - The electrochemical cell is used as an electrochemical electrolyzer, electrochemical pump or electrochemical filter (claimed).    ADVANTAGE - The electrochemical cell does not suffer from the problems associated with electrochemical cells having a fluorinated polymer electrolyte membrane.    DETAILED DESCRIPTION - Electrochemical cell, i.e. electrolyzer or pump, comprises:    (a) an anode (14a) comprising a hydrogen-carrying fluid or water feed chamber (23a) with an inlet for receiving the fluid or water and an outlet for discharging unreacted water and product oxygen gas;    (b) a cathode (16) comprising a hydrogen product chamber (25) with an outlet for discharging a hydrogen product gas and    (c) a high-temperature low-hydration membrane between the anode and cathode.    The anode and cathode are electrically coupled to an electric current source (24) for powering the electrochemical cell to produce hydrogen gas in a reduction reaction at the cathode and oxygen gas in an oxidation reaction at the anode.    INDEPENDENT CLAIMS are also included for:    (1) an electrolyzer system comprising the electrolyzer, a feed water stream in fluid flow communication with the water feed chamber inlet, a hydrogen product stream in fluid flow communication with the hydrogen product chamber outlet, and a heat exchanger thermally coupled to the electrolyzer and in fluid flow communication with the water feed stream upstream of the electrolyzer; and    (2) an electrochemical pump system comprising the electrochemical pump, a hydrogen feed stream, a hydrogen discharge stream, a heat exchanger and a recirculation pump in fluid flow communication with the discharge stream.    DESCRIPTION OF DRAWING(S) - The figure is a schematic illustration of a hydrogen electrochemical pump.    Anode (14a)    Cathode (16)    Feed chamber (23a)    Electric current source (24)    Hydrogen product chamber (25)