What is a heating artifact without electricity in winter?

A thermos literally means a bag filled with hot water. Modern hot water bottles heat easily heated substances through electric heating devices, which saves the trouble of filling hot water. Therefore, electric hot water bottles and electric baking pans are increasingly favored by people.

Winter is the time for hot water bottles to show their talents, but it is a bit overqualified to regard hot water bottles as simple heating equipment. It also has many unexpected medical and health care uses.

Extended data

Development process—

The traditional hot water bottle is just an empty bag made of rubber, usually square, with a hot water inlet and outlet at one end and a sealed plug, mostly a screw plug. It keeps warm by pouring hot water. With the development of science and technology, a new type of hot water bag has appeared in the market: electric hot water bag and electric cake.

The water storage electric hot water bag is filled with liquid, and there is a heater in it. Plug in the power supply to heat the liquid in the bag to achieve the purpose of heating. The electric baking pan is filled with thermal insulation cotton, which can be heated by plugging in the power supply to achieve the heating effect.