A fuel cell device including an elongate ceramic substrate having an exterior surface defining an interior ceramic support structure having non-active end regions and an active zone therebetween that includes electrodes in opposing relation with an electrolyte therebetween for undergoing a fuel cell reaction when supplied with heat, fuel and oxidizer. The electrolyte is a ceramic co-fired with the interior ceramic support structure. The end regions lack opposing electrodes and extend away from the active zone to dissipate heat. Gas inlets are positioned in the end regions with respective outlets in either the active zone or opposite end region, and elongate passages are coupled therebetween at least partially extending in opposing relation through the active zone. The electrodes are positioned adjacent the gas passages in the active zone and are electrically connected to exterior contact surfaces on the exterior surface of the end regions for external connection to voltage nodes.