Firefighters were called to a boat fire on Anderson Square in Bromley By Bow.
A moored narrowboat was destroyed by fire. Two men left the boat before the Brigade arrived. One man was taken to hospital by London Ambulance Service crews.
The Brigade’s 999 Control Officers took nine calls to the blaze.
The fire is believed to have been caused by a barbecue.
Leading Firefirefighter Zain-Ul Khan said: “Crews arrived at the scene to find a boat along the canal which was completely alight.
“Two men had left the boat before we arrived and crews worked quickly to bring the fire under control.
“It’s really important that you always place barbecues on level ground, far away from anything that can easily catch fire.
“Always make sure barbecues are not left unattended and check they are completely out when you have finished as they can stay hot for a long time.
“Never burn dangerous items, like aerosol cans, paint tins, batteries or anything else that adds fuel to a fire.”
The Brigade was called at 2344 and the fire was under control by 0045. Three fire engines and around 15 firefighters from Poplar, Stratford and Bethanal Green fire stations attended the scene.