(EP985241-A1)      An integral polymer electrolyte membrane (PEM) fuel cell-heating module comprises (a) a stack of PEM fuel cells having, on each side of a polymer electrolyte membrane, an anode or cathode electrode, a gas distribution layer and a bipolar plate, the anode being a double layer anode comprising a CO and/or methanol vapour oxidation selective catalyst layer and a membrane-side electrochemically active layer; (b) a thermally insulated, gas-tight, tubular casing (M) surrounding the PEM fuel cell stack; (c) a methanol reformer (R) for producing a CO- and methanol vapour-containing hydrogen fuel gas from steam and methanol; (d) a catalytic residual gas burner (B) for generating steam and heating the reformer; and (e) an air circulator (L) located within the casing (M) for circulating moist air through air channels in the gas distribution layers. Also claimed is a PEM fuel cell stack for use in the above module.    USE -   The module is used in a fuel cell installation for domestic energy supply (claimed).    ADVANTAGE -   The module design ensures constant optimal moistening of both the cathode side and the anode side of the polymer electrolyte membrane during rapidly fluctuating current loads without external humidifying equipment and is suitable for domestic energy supply at 2-10 kW with methanol reformer gas without additional CO cleaning equipment.    (EP985241-B1)      An integral polymer electrolyte membrane (PEM) fuel cell-heating module comprises (a) a stack of PEM fuel cells having, on each side of a polymer electrolyte membrane, an anode or cathode electrode, a gas distribution layer and a bipolar plate, the anode being a double layer anode comprising a CO and/or methanol vapour oxidation selective catalyst layer and a membrane-side electrochemically active layer; (b) a thermally insulated, gas-tight, tubular casing (M) surrounding the PEM fuel cell stack; (c) a methanol reformer (R) for producing a CO- and methanol vapour-containing hydrogen fuel gas from steam and methanol; (d) a catalytic residual gas burner (B) for generating steam and heating the reformer; and (e) an air circulator (L) located within the casing (M) for circulating moist air through air channels in the gas distribution layers. Also claimed is a PEM fuel cell stack for use in the above module.    USE -   The module is used in a fuel cell installation for domestic energy supply (claimed).    ADVANTAGE -   The module design ensures constant optimal moistening of both the cathode side and the anode side of the polymer electrolyte membrane during rapidly fluctuating current loads without external humidifying equipment and is suitable for domestic energy supply at 2-10 kW with methanol reformer gas without additional CO cleaning equipment.