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(Chemistry) a system in which a coolant is circulated by convection caused by a difference in density between the hot and cold portions of the liquid
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌθɜr məˈsaɪ fən)

an arrangement of siphon tubes that enables water in a heating apparatus to circulate by means of convection.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
A basic thermosiphoning hot water system has a stainless steel heat exchanger coil bolted to the inside of the firebox and passing through the rear of the stove to connect with pipes that run up to a regular 30 to 120 gallon hot water storage tank above the stove by at least 18 inches, and ideally placed on the second floor above the stove.
However, there appeared to be significant reverse thermosiphoning in the collector loop at night.
"That also means we could downsize the water pump because we used thermosiphoning to move hot coolant to the roof, and back to the engine." Ironic, isn't it, that a bunch of engineering students from Idaho resurrected a cooling technology commonly used by Ford when its founder was in charge, although Old Henry left the radiator in a more conventional location.
The drum content is circulated naturally through the water front by "thermal siphoning," also known as "thermosiphoning." Here is another two-bit word that simply means that cold water sinks, hot water rises; and this motion circulates the water naturally.