Abstract: The invention relates to a heat exchange device comprising a channel wall defining a flow channel with an inlet for receiving a gas flow. The device further comprises one or more heat exchange surfaces positioned inside the flow channel creating different parallel flow paths for the gas flow through the flow channel, at least one of the heat exchange surfaces embedding one or more flow paths for a fluid heat exchange medium. The one or more deflection elements are positioned inside the flow channel and are attached to the channel wall to deflect the gas flow away from the channel wall.

Abstract: The invention is a heat exchanger that transfers heat from one medium to another by pulling a heated medium through a series of expansion chambers and water-immersed tubes that transfers the heat from one medium to another, including a secondary set of coils to increase the efficiency.

Abstract: The present invention is directed towards a water heater having a combustion chamber and a water tank positioned adjacent to the combustion chamber. The water tank has a flue tube extending through or surrounded by the water tank and has an upstream end positioned to receive combustion gases from the combustion chamber and a downstream end positioned to exhaust the combustion gases. The flue tube also has a wall that extends between the upstream and downstream ends. The wall of the flue tube has an inner surface defining a combustion gas passage and an outer surface positioned to contact water received in said water tank. The walls have convolutions along at least a portion of their length and are configured to reduce laminar flow of the water adjacent the outer surface of flue tube, thereby providing increased heat transfer between the combustion gases in the flue tube and the water in the water tank.

Abstract: An environmentally-friendly heating apparatus which can collect and recover heat of exhaust gas discharged from a boiler in order to use the heat for heating an indoor space. The heating apparatus filters the exhaust gas, using a mist filter formed by vapor generated in a flue, thereby minimizing the quantity of exhaust fumes containing noxious substances.

Abstract: A water heater includes a water tank adapted to contain water; a flue extending through the water tank and having a first end communicating with the water heater's combustion chamber for the flow of products of combustion through the tank; a damper communicating with the flue; and an apparatus for creating a flow of air proximate the second end of the flue to resist the flow of warm air out of the second end of the flue due to standby convection. The apparatus for creating airflow may be a fan or an ionic wind generator. Additionally, the airflow may be directed into or across the end of the flue at the top of the water heater to either create a downdraft or an air curtain for containing warm air within the flue.

Abstract: A hot water heater having a housing with a top chamber, a bottom chamber and a main tank. A cold water inlet pipe runs into the top chamber and extends into the tank. The cold water inlet pipe coils inward, beginning at circumference of the top chamber before extending into the tank, thus increasing the distance the water has to travel inside the heater. Contrastly, the hot water outlet pipe runs straight from the main tank through the top chamber and exits therefrom. The bottom chamber has a dome shaped ceiling with peaked apertures. A burner is positioned along the bottom surface and produces a flame that sends heated air upward, through the peaked apertures into connected heat distribution tubes which travel vertically through the tank. These tubes are angled along their length and have cylindrical fins attached. Once the heat from the flame rises through the apertures, it continues upward through the tubes, until it is released into the top chamber and exits trough an exhaust chimney.