Portable heating systems and methods

A portable hot air generator for heating ambient air by heat which is released by an exothermic hydration of at leas one oxide of at least one alkali earth metal and then delivering heated ambient air to a target comprising:

• at least one portable reactor which is configured to retain therein said oxide of said metal;
• at least one air inlet fluidly communicating with said reactor and ambient air including water;
• at least one air outlet fluidly communicating with said reactor and target;
• and
• at least one air supplier which is configured to be in fluid communication with said ambient air, reactor, and target, to supply said ambient air into said reactor through said air inlet, and to discharge said heated ambient out therefrom,
• whereby said metal oxide reacts with said water inside said reactor and heats said ambient air therein and whereby said air supplier delivers said heated air to said target through said air outlet.

A method of generating heat by a portable heating system without using electricity and without burning fuel comprising the steps of:

• charging a refillable reactor with at least one oxide of at least one alkali earth metal capable of generating heat by hydration thereof;
• incorporating said reactor into said system;
• supplying air containing therein water to said metal oxide, thereby generating said heat;
• removing said metal oxide from said reactor after a preset extent of said hydration;
• and
• repeating said charging with fresh metal oxide.