Hydrogen production by water splitting with Mn(II) ferrite and CaO (or Na2CO3) at 1273 K (or 873 K) was studied. The mixed powder of MnFe2O4 and CaO (CaO/MnFe2O4 > 3) (or Na2CO3) generates H-2 by reaction with H2O at 1273 K (or 873 K). This H-2 evolution is caused by the oxidation of Mn(II) ion in the ferrite to the Mn(III) ion. The temperature of 873 K is considerably lower for the solar furnace reaction (O-2 releasing step) in the two-step water splitting (1500-2300 K) process. This lower temperature and economical availability of required elements would permit further progress in the direct solar energy absorption/conversion into H-2.