A portable heater is a device that can be used to provide warmth in a variety of settings. The two crossword solutions for this term are 'sterno' and 'BRAZIER'. A sterno is a type of portable heater that uses a gel fuel to generate heat. It is often used in outdoor settings such as camping or tailgating. A BRAZIER is another type of portable heater that uses charcoal or wood to generate heat. It is often used in outdoor settings such as patios or decks.