Steve Willson owned and operated his own carpentry contracting business in Rochester, N.Y. He then joined Popular Mechanics magazine where he was their Home Improvement editor for 22 years. Willson is the author of three books and has edited or rewritten 11 books on various home improvement, plumbing and tool-use topics. To learn more about the different kinds of water heaters Willson talks about in this article, you can go to The Home Depot website.