Odorless, Smokeless Diethylene Glycol
The fuel is diethylene glycol, the liquid most long-burn wick cans use, and LeoLight's headline claim is that it burns with no smoke or chemical smell. That matters more than it sounds. A chafer sits under food at eye level for hours, often in a dining room or marquee, and a fuel that smells or leaves soot on the pan is noticed by every guest who leans in. One owner, who uses these for meal service in the community, chose them specifically because they are odorless and spill-proof. Diethylene glycol still needs the usual care. It is toxic if swallowed, so cans belong out of reach of children and pets, and a used can should be capped once cool rather than emptied. Any chafing fuel should be burned in a well-ventilated room, however clean it is.