A fuel reformer module comprising: a fuel reactor body enclosing a hollow fuel chamber wherein the hollow fuel chamber is bounded by a perimeter wall, disposed along a chamber longitudinal axis, a cap wall, attached to the perimeter wall and disposed to enclose a top end of the fuel chamber, and a reactor shield base wall, attached to the perimeter wall and disposed to enclose a bottom end of the fuel chamber; wherein the reactor shield base wall includes a base wall top surface facing into the hollow fuel chamber and a substantially parallel and opposing base wall bottom surface facing out of the hollow fuel chamber and a plurality of substantially identical base wall fuel passages each extending through the reactor shield base wall from the base wall top surface to the base wall bottom surface; wherein each base wall fuel passage has a substantially constant cross-sectional area along its longitudinal length and is axially centered by a passage longitudinal axis that is substantially parallel with the chamber longitudinal axis; a catalyzing body comprising a solid non-porous ceramic substrate bounded by a catalyzing body top surface and a substantially parallel and opposing catalyzing body bottom surface; wherein the catalyzing body top surface is disposed proximately opposed to the base wall bottom surface across an interface; wherein the catalyzing body includes a plurality of substantially identical catalyst fuel passages each extending from the catalyzing body top surface to the catalyzing body bottom surface with each of the plurality of catalyst fuel passage having a substantially constant cross-sectional area along its longitudinal length and a catalyst layer coated onto inside surfaces thereof; wherein each of the plurality of base wall fuel passages is longitudinally aligned with one of the plurality of catalyst fuel passages such that each of the plurality of base wall fuel passages shares a substantially coaxial longitudinal axis with one of the plurality of catalyst fuel passages. a fuel reactor body enclosing a hollow fuel chamber wherein the hollow fuel chamber is bounded by a perimeter wall, disposed along a chamber longitudinal axis, a cap wall, attached to the perimeter wall and disposed to enclose a top end of the fuel chamber, and a reactor shield base wall, attached to the perimeter wall and disposed to enclose a bottom end of the fuel chamber; wherein the reactor shield base wall includes a base wall top surface facing into the hollow fuel chamber and a substantially parallel and opposing base wall bottom surface facing out of the hollow fuel chamber and a plurality of substantially identical base wall fuel passages each extending through the reactor shield base wall from the base wall top surface to the base wall bottom surface; wherein each base wall fuel passage has a substantially constant cross-sectional area along its longitudinal length and is axially centered by a passage longitudinal axis that is substantially parallel with the chamber longitudinal axis; a catalyzing body comprising a solid non-porous ceramic substrate bounded by a catalyzing body top surface and a substantially parallel and opposing catalyzing body bottom surface; wherein the catalyzing body top surface is disposed proximately opposed to the base wall bottom surface across an interface; wherein the catalyzing body includes a plurality of substantially identical catalyst fuel passages each extending from the catalyzing body top surface to the catalyzing body bottom surface with each of the plurality of catalyst fuel passage having a substantially constant cross-sectional area along its longitudinal length and a catalyst layer coated onto inside surfaces thereof; wherein each of the plurality of base wall fuel passages is longitudinally aligned with one of the plurality of catalyst fuel passages such that each of the plurality of base wall fuel passages shares a substantially coaxial longitudinal axis with one of the plurality of catalyst fuel passages.