A hot-water bottle is a bottle filled with hot water and sealed with a stopper, used to provide warmth, typically while in bed, but also for the application of heat to a specific part of the body.
Antique metal hot-water bottle from 1925
English Stoneware bed warmer and stopper
Two modern hot-water bottles shown with their stoppers
An American pottery hot water bottle
A bed warmer or warming pan was a common household item in countries with cold winters, especially in Europe. It consisted of a metal container, usually fitted with a handle and shaped somewhat like a
Hot water bottle
…for warmth in bed were in use as early as the 16th century. The earliest versions contained hot coals from the dying embers of the fire, and these bed warmers were used to warm the bed before getting into it. Containers using hot water were soon also used, with the advantages that they could remain in the bed…
Bed warmer from the Netherlands
Electrical bed warmer (with a shielded electric bulb) in India, 1979