Patent ID: 7190886
Filing Date: 2007-03-13
Classification: F24H,H05B

Abstract:
1. A pressurized demand water heating device for the direct heating of output water having an electrical conductivity, comprising (a) a vessel having top and bottom ends and side walls and provided with a water inlet and water outlet and a lid closing the top of said vessel and defining a space therebetween, one or a plurality of closely-spaced individually removable non-hairpinned electrodes extending substantially parallel to each other substantially vertically across the vessel between said top and said bottom ends, and electrical terminals located in the space provided between said vessel top and said lid for connection of said electrodes to a source of electrical power, (b) switching means for selectively connecting one or more of said electrodes to a source of electrical power wherein the electrodes switch on only when water flow through the heating device commences whereby water may be heated directly by passage of the electric current therethrough, (c) transducer means operatively responsive to the electric current for controlling the switching means.