Abstract: A method for burning a fuel in a wood stove having a door to a combustion chamber with a base, which combustion chamber is isolated from the air by an exhaust and an intake at which intake there is provided an air regulator having at least primary, secondary and tertiary air intake ducts. The stove is controlled by a burn controller configured to operate between the different operating, i.e. different combustion states.

Abstract: A method, system, and apparatus for capturing heat wherein one or more fins are arranged such that hot air is trapped by the fins and must descend below at least one of the fins in order to exit through an outlet.

Abstract: An improved fire grate may provide fresh oxygen rich air to a secondary combustion zone, created by the improved fire grate, of a combustion chamber where a combustion gas stream is typically oxygen starved assisting in the burning process of incompletely burned particulates and reducing other harmful emissions. A baffle plate may be introduced in the secondary combustion zone to increase a combustion chamber temperature, encourage mixing of oxygen starved air with oxygen rich air and increase a residence time of the combustion gas within the combustion chamber. These aspects of the baffle plate promote more efficient burning of the biomass/fuel. Additionally, log lighter(s) may be disposed in the secondary combustion zone to increase a temperature of the combustion chamber for the purposes of reducing harmful emissions.

Abstract: A heat recovery apparatus for an indoor fireplace includes a plenum chamber of low profile box-like construction having a front extremity with a portion that permits forced entry of air and a horizontally spaced portion that permits emergence of heated air. A divider wall centered within the chamber between the entry and emergence portions produces a passageway that controls the flow of air within the chamber.

Abstract: A firewood retainer assembly and a fireplace incorporating the same are provided. The assembly includes a grate for supporting firewood at a level above a floor of a fireplace combustion chamber. The grate includes a first end opposite a second end such that a width of said grate is defined between these ends. The assembly also includes a deflector positioned adjacent the grate for deflecting air entering said combustion chamber below the level. A method of burning firewood is also provided which results in reduced particulate emissions. The method requires the deflection of air used for combustion below the firewood, heating the air with embers located below the firewood, and using the heated air for combustion.

Abstract: A wood burner includes a wrapper. A firebox is positioned in the wrapper that defines a combustion chamber. An air inlet is placed in communication with an external air supply. The air inlet includes a conduit to conduct the external air to the combustion chamber and a second conduit. A manifold is positioned above the firebox. The manifold is in communication with the second conduit, and includes one or more manifold chambers for permitting the external air received thereby to become heated. A plurality of air tubes connect to the manifold to receive the heated external air from the manifold, each plurality of air tubes including a plurality of apertures to direct the heated external air into the combustion chamber adjacent an upper inner surface of the firebox.

Abstract: An improved fireplace insert used in a fireplace to surround a heat source, including an arcuate conduit that is able to substantially surround the heat source on multiple sides. The conduit includes an inhaling end and an exhaling end, and divided into an intake channel, a base channel, and an outtake channel. The intake channel includes a proximal end and a distal end; the base channel includes a first end and a second end; and the outtake channel includes a proximal end and a distal end. The proximal end of the intake channel is connected to the first end of the base channel, and the proximal end of the outtake channel is connected to the second end of the base channel for the conduit to be in a significantly U-shape. A fan is positioned near the distal end of the intake channel and is able to force heated air through the conduit.

Abstract: For use with a fireplace, a heat exchanger mounted across the top portion of the fireplace with the heat exchanger comprising a heat exchanger core with four identical extruded core sections connected together around an inner spin chamber for the passage of combustion gases and surrounded by an outer spin chamber for the passage of combustion gases, with each core section having a center core passageway for the passage of room air and the heating of the room air by the heat from the combustion gases being transferred to the room air through the heat exchanger cores, and tortuous passageways between the core sections from the outer spin chamber to the inner spin chamber to increase the area of contact by the hot combustion gases to the core sections and to increase the dwell time of the combustion gases in the core to increase the amount of heat transferred to the combustion gases to the room air in the core sections.

Abstract: A heat exchange device is disclosed herein to be used in conjunction with a standard fireplace. The heat exchange device is made from a continuous tube fabricated into loops that surround the burning fuel. The ambient room air, introduced through an opening for air entry into the tube, is blown through the internal lumen of the tube fabricated into loops, the external surfaces of which are in direct contact with burning fuel and flame. The air passing through the internal lumen of the tube fabricated into loops is heated to a high temperature by the burning fuel and flame.

Abstract: A system for heating the air in the room containing a fireplace includes a heat exchanger mounted at the top portion of the combustion chamber of the fireplace to extend across the chimney flue opening and a fan for circulating room air through the heat exchanger in heat exchange relationship with the combustion gases passing from the combustion chamber in a vortex flow through a heat exchange passage in the heat exchanger to the chimney flue opening. There are preferably provided a pair of the heat exchangers mounted in side-by-side relationship to conform with the rectangular shape of the plan view of the fireplace.

Abstract: Regenerator with tube system, particularly for fireplaces and the like, which can be inserted at the firebox of fireplaces and comprises a metallic heat-exchange body that is constituted by a single tubular body shaped so as to have straight and parallel portions that rest on the heart of the firebox, two identical curved loop portions that rest on the rear vertical wall of the firebox, a single transverse loop lying at the front of the firebox, and two ends that are parallel and close to each other, and are directed towards the outside of the fireplace, one of the ends being connected to a box-like body that contains a motorized fan for sending the ambient air to be heated into the heat-exchange body, the other end being connected to a duct for delivering the heated air into the surrounding space, the delivery duct being also contained in the box-like body.

Abstract: A gas fireplace assembly for connection to a venting system comprises an outer shell for installation in the interior space of a building with the venting system extending into the outer shell. A fireplace unit is insertable within the shell that includes a combustion chamber. The combustion chamber includes a removable platform supporting a burner unit to be secured within the combustion chamber. The existing venting system is connected to the combustion chamber. The foregoing arrangement permits easy conversion of the fireplace assembly to different styles of decorative burner units or from a decorative gas burner to an efficient heating fireplace system and vice versa in a simple and economical manner.

Abstract: An enclosed gas fireplace which efficiently transfers heat from a combustion chamber to surrounding air chambers and to air flow conduits which pass through a flue gas offtake. The fireplace has an outer shell that remains relatively cool, so that the fireplace can be installed in a framed sheetrock or wood enclosure without the need for utilizing the special masonry work or masonry chimney normally required for a fireplace. In addition, the invention provides a special burner arrangement to enhance the aesthetic quality of the fire and which provides a clean-burning gas flame to meet modern emission standards.

Abstract: An enclosed gas fireplace which efficiently transfers heat from a combustion chamber to surrounding air chambers and to air flow conduits which pass through a flue gas offtake. The fireplace has an outer shell that remains relatively cool, so that the fireplace can be installed in a framed sheetrock or wood enclosure without the need for utilizing the special masonry work or masonry chimney normally required for a fireplace. In addition, the invention provides a special burner arrangement to enhance the aesthetic quality of the fire and which provides a clean-burning gas flame to meet modern emission standards.

Abstract: A fireplace furnace heating system for a structure having a firebox for combustion of fuel, preferably coal. A heating unit is disposed proximately to, and preferably surrounds the firebox. Conduits carry interior air from remote locations to the heating unit. The heating unit is preferably a multi-walled, chambered structure to define numerous air passageways. Air delivered from the conduits to the heating unit must travel through the air passageways. The proximate disposition of the heating unit to the firebox heats the heating unit and the air travelling therethrough. The heating unit has vents for returning the heated air to the interior of the structure. A blower is included for forcible moving the air through the heating unit and back to the interior. Conduits are also provided for supplying fresh air from the exterior to the firebox to fully combust fuel in the firebox. A motorized blower is included to forcibly move the combustion air. Also included is a tempering tank for storing water.

Abstract: An unvented gas-fired heater assembly including a base having a gas burner mounted thereon in a combustion area. Gas logs are disposed in the combustion area for heating by the gas burner. A duct assembly is provided which directs heated air from the heater assembly, and the duct assembly is height adjustable to change the height at which air is discharged from the unit. All of the components of the heater are assembled as a unit so that the unit is easily insertable and mountable in an enclosure sure as a fireplace.

Abstract: A fireplace heat exchanger having input means that is directly connected to a blower assembly, air to be heated is drawn in by the blower assembly and forced directly through the input means into a heat reservoir that is suspended directly above or within the flame of the fireplace. The air is heated within the heat reservoir and then forced through an output means that includes a plurality of discharge ports through which the heated air is dispersed into a room. An aesthetically appealing manifold covers those portions of the input and output means that are outside the fireplace. That portion of the manifold that covers the output means includes a corresponding plurality of discharge ports through which the heated air is dispersed. The input and output means slidably fit within the input and output riser tubes so the heat exchanger can be adjusted for fireplaces of various depths. The heat exchanger can be used with fireplaces having a frame with closable doors, wire mesh curtains, or the like.

Abstract: A forced air gas fired heating device may be utilized as a stove insert for a conventional open fireplace or in an alternative embodiment may be formed with a double walled construction for use as a free standing unit. In both embodiments a gas burner adjacent a bottom portion of the housing heats an air space within the housing. A room air inlet conduit traverses back and forth across the heated air space and communicates with an air distribution chamber in an upper portion of the housing. A plurality of room air outlet conduits extend outwardly from the distribution chamber through a front wall of the housing. A heat exchanger is suspended from each of the room air outlet conduits and includes a hollow body portion in fluid communication with the associated air outlet conduit. Each of the heat exchangers has an enclosed longitudinally extending corrugated heat conductive metal plate and terminates in a bottom heat conducted metal plate deposed adjacent the gas burner.