How to thaw frozen pipes underground ? This article will discuss the different methods of how to thaw frozen pipes underground . The methods discussed in this article are: 1) Thawing with a torch (flame) 2) Thawing with an electric heater 3) Thawing with a defrost gun 4) Thawing with a gas heater 5) Using a shovel to break up the ice and thaw out the pipe. Why Do Frozen Pipes Thaw In The Winter? The process of freezing pipes is a complicated one. The water inside the pipe freezes and expands, pushing the walls of the pipe outwards. This…