Abstract: A steam generating apparatus which includes a novel gas burner and consisting of a pair of spaced coaxial cylinders, the outer of which is of considerably greater axial length than the inner and both of which are provided with apertures for admixing the gas with air. The inner cylinder functions as an integral pilot burner which is highly stable. The steam generating apparatus heats water to provide steam, heats it still further, then condenses the steam into liquid to assist in the formation of still more steam.

Abstract: A water purification apparatus capable of treating water having impurities producing substantial foaming includes a boiler tank having a water inlet and heater, and a stack portion thereabove containing contact surface means and a heater for heating the contact surface means to a temperature above the vaporization temperature of water. In this manner water droplets which may be carried by the steam vapors from the boiler and/or foam will be immediately vaporized as it comes in contact with the contact surface means. The steam vapors pass through a condenser assembly, and the condensate passes through a filter assembly before storage in a tank. The contact surface means desirably comprises screen members providing a tortuous path and high heat conductivity. Baffle members may be interposed in the flow path for vapors from the boiler tank to the stack.

Abstract: A compact and fast acting tankless heater has an elongated tubular casing having water inlet and outlet conduits at opposite ends. A elongated generally helically twisted inner tube is disposed coaxially within the casing to define helical channel means between the tube and casing for conducting water longitudinally from the casing inlet to the casing outlet. The inner tube has a water inlet at one end communicating with the water inlet of the casing and the other end of the tube is closed. An elongated electric heating means is disposed within the inner tube for heating the water therein. The inner tube has a plurality of longitudinally spaced openings for conducting hot water and steam from the inner tube into the helical channel means to combine with the water flowing through the helical channel means from the casing inlet to the casing outlet. An additional electric heater sleeve can be provided to surround the exterior of the casing.