One word of caution.
Some steel gutters may be zinc plated. When zinc is heated it can give off fumes (as opposed to vapors). This is very, very bad to inhale. Causes what is called "metal fume fever".
Simply insure that the steel is NOT zinc plated and you are OK.
Best,
John


Humble member of the League of Extraodinary Gentlemen (LEG). Joined 14 March, 2006. Member #1.