Device used in fridge

• Early stage shoe's warmer

Wikipedia Word definitions in Wikipedia
A heat pump is a device that provides heat energy from a source of heat to a destination called a "heat sink". Heat pumps are designed to move thermal energy opposite to the direction of spontaneous heat flow by absorbing heat from a cold space and releasing ...

Wiktionary Word definitions in Wiktionary
n. A device that transfers heat from something at a lower temperature to something at a higher temperature by doing work

WordNet Word definitions in WordNet
n. apparatus that extracts heat from a liquid that is at a higher temperature than its surroundings; can be used to transfer heat from a reservoir outside in order to heat a building

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ Both the photovoltaic and wind power systems for domestic hot-water provision would be even more effective if linked to a heat pump . ▪ Energy systems analysis, heat pump control and applications. ▪ His heat pump is relatively ...