Fast recovery electric fluid

A fast recovery water heating system comprising a closed elongated housing defining an interior space, said interior space being capable of being entirely filled with water and said housing being capable of withstanding high internal pressure, said housing including:

• first and second ends, first and second elongated electrical heating elements extending into said interior space through said first and second ends respectively, said elements being coaxially aligned with said housing,
• admitting means in said housing located toward one of said ends for injecting water into said space,
• withdrawing means in said housing located toward the other of said ends distant from said admitting means for permitting withdrawal of water from said space,
• a first helical tubular member disposed coaxially around said elements and generally extending from said first to said second end, inlet and outlet means connected to ends of said helical member for permitting and controlling the passage of water through said member,
• an open-ended elongated tubular member disposed coaxially with respect to said heating elements and within said helical tubular member, said elongated tubular member including a plurality of apertures therein located generally midway along the length thereof to allow the water filling the interior of the elongated tubular member and highly heated by said heating elements to flow out of the elongated tubular member into contact with the helical tubular member,
• first and second thermostatic means affixed to said housing proximate said first and second elements respectively for controlling the flow of electricity to said heating elements to maintain a relatively constant predetermined temperature within said interior space,
• the volume of said interior space and the heat output of said heating elements being selected so that a nearly instantaneous increase in water temperature is achieved when said heating elements are energized.