This book endeavors to bring together in one place the information and experience needed to provide good initial design of water heating systems and effective upgrades of existing systems, with particular reference to New Zealand domestic practice. Topics cover: an introduction to water heating systems; the properties of water; hot water use in domestic dwellings; hot water storage, pressure, control and temperature management; safety aspects of water heating systems and the NZ Building Code; distribution and delivery of hot water; and alternative sources of energy for water heating.