Caleffi’s idronics, “Geo-Hydronic Systems” explains the basics of heat pump operation and describes several types of heat pumps. It also describes the use of modern hydronics to enhance the efficiency and comfort provided by these heat pumps. Other discussion topics include system configurations ranging from simple single-zone/heating-only systems to large multiheat pump heating and cooling systems. Find specific information on sizing components such as buffer tanks, expansion tanks and circulators. www.caleffi.info/idronics.