Plumbing & Mechanical columnist John Siegenthaler’s new book, “Heating with Renewable Energy,” is a 850-page, full-color text that shows readers how to design and construct practical systems that supply space heating and domestic hot water using renewable energy heat sources. It uses modern hydronics as the enabling technology for these systems. The book provides detailed discussions for each type of renewable energy heat source, includes analytical tools needed for proper design and gives many examples of how they are used.