Heating device and method of manufacturing the same

摘要

A multi-layered heating device including a first container having a top layer and a bottom layer. A second container, containing heat retaining fluid, is positioned inside the first container and adjacent to the top layer thereof. Adjacent to the second container is an electrical heating element, and a layer of padding material is positioned between the electrical heating element and the bottom layer of the first container. A preferred embodiment of the heating device includes at least one thermostat, with the second container having a first layer and a second layer wherein at least one portion of each of the layers are secured together to form at least one depression which is devoid of the heat retaining fluid and which coincides with the at least one thermostat.