Using compression/expansion (pressure differential).

or, similar to the hot side of an air conditioning unit.

No fire needed, just the ability to compress the liquid.

Seems I was inspired by an old junkyard wars tv episode.

Just something to consider.
_________________________
The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)