Quick Answer: You can successfully heat shrink wire connectors using a hair dryer, lighter flame, soldering iron, hot air from a space heater, boiling water, oven heat, or even a candle flame. Heat shrink tubing is useful in industrial, automotive, and electrical applications because it provides a protective seal against abrasion, chemicals, and moisture. To prevent short circuits and reduce wear and tear on cables, it helps insulate wires, extending their lifespan. Heat shrink tubing. Heat shrink tubing is a type of plastic tube that contracts when exposed to heat. This makes it indispensable for professionals in various fields such as electronics, automotive, and more.