Here is a picture of the aftermath of heating them in an oven for 7 minutes at 250 degrees Fahrenheit. No damage and after standing in them for about 10 minutes they molded to my feet perfectly. Ronix recommends heating at 120 Celsius, which equals 248 degrees Fahrenheit so using hot water, hair dryer, or heat gun will not work. Keep in mind water boils at 100 degrees Celsius.
Yes, I'm sure the machine is better and definitely safer. As I understand the boot slides onto something so just the inside is heated? A snowboard shop in my area said they would do it for $20 but rather than spend the cash and drive an hour I just did it myself. No problems and they fit great.
Scott is dead on about the J-Bars. They stick right to the L shaped velcro inside the boot, not the insert. I tried them on without the j-bars first and liked the locked in feel much better with them installed. I put mine in before I heated with no problem.