A man who suffered burns to his body after a jetski exploded at a factory in Auckland is now in a stable condition.

Emergency services were called to an explosion at a building on Atkinson Ave, in Otahuhu, at about 9.30pm yesterday.

A man was taken to Middlemore Hospital in a moderate condition after suffering burns.

A spokeswoman for the hospital this morning said: "He is stable and doing well."

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Northern fire communications spokesman Jaron Philips said the explosion caused the jetski to burst into flames inside the building where it was stored.

"It was on fire inside a shed, and the shed was attached to other buildings."

Firefighters "managed to contain it [the fire] pretty quickly," he said.