Dan Holohan is conducting a one-day seminar on steam and hydronic systems April 28 in Southfield, Mich.

PMcolumnist Dan Holohan is conducting a one-day seminar on steam and hydronic systems April 28 at the St. Johns Banquet & Conference Center, Southfield, Mich. The first part of the day will concentrate on steam systems, the second on hydronics. For more information, contact Ron George at 734/586-2040,rongeorge@charter.net.