warming pan

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A metal pan with a cover and a long handle, designed to hold hot liquids or coals and used to warm a bed.

from The Century Dictionary.

• noun A large covered long-handled flat vessel (usually of brass) into which live coals are put: used to warm the inside of a bed.
• noun A person put into a situation, post, or office temporarily, to hold it for another till the latter becomes qualified for it.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A covered metal pan attached to a long handle, holding live coals and used to warm a bed.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a long-handled covered pan holding live coals to warm a bed