Temperature control device

摘要

An automatic device for closely held temperature control of a body of liquid via an electric heater, as for example via a liquid-immersed heater element. The control device provides an enclosed air space with shared exposure to ambient air and to air that has been heated by the liquid. Thermostatic-switch means and an electrical heater element are contained within the enclosed air space and cooperate to establish an on-off supply of electrical energy to the immersed heater element.