"Quick & Basic Hydronic Controls" covers what heating contractors need to know about circuits, relays switches, loads and power supplies. Author Carol Fey also wrote "Quick & Basic Electricity." The $14.95 book can be ordered by logging on to Dan Holohan's Web site, HeatingHelp.com or you can call Fey at 303/795-2679.
Did you enjoy this article? Click here to subscribe to Plumbing & Mechanical. Stay connected with us via social media.