Three NSW Ambulance crews were called to the scene after receiving reports of a boat explosion and fire just after 10.30am on Australia Day, with the Westpac Rescue Helicopter also tasked to the incident to assist.

READ ALSO:

NSW Ambulance paramedics and the Helicopter Critical Care Medical Team treated the patient for significant burns to his legs, arms and face.

Still in a serious condition, he was then transported to Royal North Shore Hospital to receive specialist treatment at the burns unit.

A fuel fire was being queried as the potential cause for the incident, which also left another man suffering from smoke inhalation.

The 31-year-old man was reportedly conveyed to Orange Hospital.