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Radiant Floor Heating Update by Alex Wilson Interest in radiant floor heating is rapidly growing. Everywhere I turn, the topic comes up. Companies specializing in this type of heating are seeing dramatic growth. One example is Earth Star Energy Systems, Inc. of Waldoboro, Me., which became a Wirsbo systems distributor 2½ years ago. Earth Star's vice-president Lori Bailey estimates that they've put in over half of their 100-plus systems in the last six months. "We're installing three or four a week now," she said. Radiant floor heating is attractive for several reasons. First, it is the most comfortable form of heat available. The entire floor surface serves as the radiator, therefore its temperature can be quite low-just above room temperature. Most of