The main types of roofing soldering irons are powered by electric, acetylene, and propane gas. Electric irons need to be plugged in and do not perform very well in the cold and are better in an indoor setting. Acetylene irons will run the hottest but some people are turned off by the instability of the gas.Propane torches are a good combination of heat and consistency which allow for use in almost all environments. Plus you can take them anywhere. Express and Sievert are the leaders in the manufacturing of propane soldering torches and Stortz stands behind their products. You will find the irons, the soldering tips and all the accessories to solder on our site.