PMcolumnist John Siegenthaler is the instructor for the Advanced Hydronic Heating Design Seminar at Mohawk Valley Community College, Utica, N.Y., April 6. The seminar includes techniques that go well beyond mainstream practices. Attendees receive a detailed seminar manual, along with design software that is demonstrated in class. For costs and registration information, contact Sheila Salvatore at 315/792-5300,