Keywords: Hot water heat recycling unit.jpg A typical hot water heat recycling unit in a family residence Transferred from http //en wikipedia org en wikipedia; transferred to Commons by User Teratornis using http //tools wikimedia de/~magnus/commonshelper php CommonsHelper 2007-10-09 Original uploader was Recycle9876 at http //en wikipedia org en wikipedia Released into the public domain by the author en wikipedia Recycle9876 original upload log page en wikipedia Hot_water_heat_recycling_unit jpg 2007-10-09 03 38 Recycle9876 900�1800� 205157 bytes <nowiki>A typical hot water heat recycling unit in a family residence </nowiki> Heat exchangers Water heating devices |