a reservoir or arrangement of tubing at the back of certain stoves or fireplaces for containing water to be heated by the fire.
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
Historical Examples of water back
A range with a water-back is among the must-bes in "our house."
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