Abstract: An apparatus and method for thawing frozen lines. Water is heated and supplied under pressure to the inside of a frozen line such as a frozen plastic or metal pipe. In one non-limiting embodiment the invention comprises an air compressor, a plurality of tanks, a water heater element located in one tank, and a reel of flexible tubing. In a preferred embodiment the complete kit is mounted on a carrying device, which can be maneuvered manually through standard size doorways. In one embodiment a water delivery nozzle made of heat conducting metal is fitted to one end of the tubing. The compressor can be an electrically powered air compressor thus allowing the invention to be used inside buildings. In another embodiment deicing agent is directed into a frozen pipe in controlled pulses to further aid thawing of frozen lines.