The invention relates to a hydrogen combustion heater. This heater includes
(a) a passage for allowing hydrogen gas and air to flow therethrough; (b)
a first catalyst provided in the passage, the first catalyst being heated,
when electricity is applied thereto, thereby starting a first combustion
of a first mixture of the hydrogen gas and the air in the first catalyst;
and (c) a heat exchanger provided downstream of the first catalyst in the
passage, the heat exchanger being adapted to transfer heat generated by
the first combustion to a heating medium of the heat exchanger.
