a reservoir or arrangement of tubing at the back of certain stoves or fireplaces for containing water to be heated by the fire.
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Origin of water back
An Americanism dating back to 1860–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for water back
A range with a water-back is among the must-bes in "our house."
British Dictionary definitions for water back
the US name for back boiler
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012