Indirect heating systems (such as hot water) are preferred over systems with heating elements or flames.
See Electrical for information about how to make electrical equipment safe for use.
All unattended electrical heating equipment should be equipped with an automatic over-temperature shutoff switch in addition to normal temperature controls if overheating could result in a fire or explosion.
Heating equipment with circulation fans or water cooling should be equipped with an interlock arranged to disconnect current to the heating elements if the fan fails or the water supply is interrupted.
Burners, induction heaters, ovens, furnaces, and other heat-producing equipment should be located a safe distance from areas where hydrogen is stored or dispensed, unless specifically designed for use with hydrogen.
When using hydrogen to create reducing environments, consider using non-explosive mixtures of inert gases (e.g., 5% H2 in argon or nitrogen) instead of pure hydrogen.