Abstract: A solid pellet fueled heater having a base unit with forced air blowers and a dual tube chimney structure is disclosed. The dual tube chimney structure may be used to warm incoming air for distribution around the heater. The pellet heater may also include a dual auger system and multi/high speed auger motor. The dual auger may include first and second auger blades mounted on a single auger shaft having blade pitches configured to convey solid fuel in opposite directions.

Abstract: A fuel burner and optional modular heat utilizing appliances capable of exploiting heat from the fuel burner are shown and described. The burner includes a fire box including a fuel holder, a surrounding inner housing, and an outer shroud surrounding the inner housing. A plurality of air openings including flow adjusters admit air to the fire box. The inner housing and outer shroud are configured to supply air for secondary combustion of the exhaust. The burner may include a fan for forced air induction, and a fuel chute having a slidable closure for recharging the fuel holder from outside. At least one modular heat utilizing appliance may have thermal insulation for retaining heat.

Abstract: A combustible gas burner includes gas flow conduit or a housing having an outlet and a pressure relief valve. The pressure relief valve includes a valve seat at the outlet, a valve body and a valve body rotator. The valve body is configured to engage the valve seat and move along an axis relative to the valve seat in response to a pressure at the outlet. The valve body rotator is configured to rotate the valve body about the axis in response to movement of the valve body along the axis relative to the valve seat.

Abstract: A fire pit includes a circular bottom plate and a circular, centrally-apertured log-supporting plate. A plurality of legs secured about the periphery of the log-supporting plate maintain the bottom and log-supporting plates in vertically spaced, parallel relation to one another. Each leg has a hollow uppermost end. A plurality of arcuate grates is mounted about the periphery of the log-supporting plate and a vertically-oriented post is secured to each of the grates, mid-length thereof. Each of the posts has a lowermost end slideably received within the hollow uppermost end of its associated leg to releasably connect each grate to the log-supporting plate. Arcuate openings positioned radially outwardly of the central opening enhance the flow of oxygen into the areas where combustion occurs. The log-supporting plate is inverted and the grates are stacked atop it when the fire pit is in its storage configuration.

Abstract: A heating system can include certain pressure sensitive features. These features can be configured to change from a first position to a second position based on a pressure of a fuel flowing into the feature. These features can include, fuel selector valves, pressure regulators, burner nozzles, and oxygen depletion sensor nozzles, among other features.

Abstract: A heater assembly can be used with a gas appliance. The gas appliance can be a dual fuel appliance for use with one of a first fuel type or a second fuel type different than the first. The heater assembly can include at least one pressure regulator, a housing, and an actuation member. The housing has a first fuel hook-up for connecting the first fuel type to the heater assembly, a second fuel hook-up for connecting the second fuel type to the heater assembly, and an internal valve. The actuation member can control the position of the internal valve based on whether the first or the second fuel hook-up is used.

Abstract: A heating device may comprise a control assembly having a self-contained, on board power supply. A control unit may control the operation of the heater and the power supply may comprise a first power source in electrical communication with the control unit, wherein the control unit controls the operation of the first power source to selectively supply electrical power to at least a portion of the heating device; and, a second power source in electrical communication with the control unit, wherein the control unit controls the operation of the second power source to selectively supply electrical power to at least a portion of the heating device.

Abstract: The invention relates to a wood pellet stove, comprising a feed device for automatically adding wood pellets in a metered manner from a pellet hopper belonging to the stove. Said pellet hopper having the feed device and a grate is accommodated in a lower, stationary stove part (20), which remains cold and does not become hot during operation. The combustion chamber having a chimney connection is accommodated in an upper stove part (21). The upper stove part (21) is supported on the lower stove part (20) by means of a turntable so that the upper stove part can be swiveled relative to the lower, stationary stove part (20). Thus, the combustion chamber and the viewing window can be swiveled in any desired direction as needed.

Abstract: A dual fuel heating system can be used in a gas appliance. The system can have an air shutter to regulate an amount of air that can mix with the fuel for combustion. The air shutter can be configured to have different positions depending on the type of fuel to be used.

Abstract: Super heater systems include self-contained units which are easily transported to remote locations. Such super heater systems include heat exchanger assemblies adapted to heat liquid on-the-fly (i.e., directly from the supply source to a wellbore or pipeline system. A heat exchange assembly may include a first header with a plurality of first header layers in alternating fluid communication, and a second header with a plurality of second header layers in alternating fluid communication. A plurality of heat exchange coils can be coupled between the first header and the second header such that the heat exchange coils are exposed to heat generated by a burner manifold. Other aspects, embodiments, and features are also claimed and described.

Abstract: The invention relates to a fume box having a separation partition (16) in the upper portion thereof that comprises a removable catalyst block (17) offset relative to the inlet (10) and the outlet (8), and an intake passage that can be blocked by at least one insulating block. Deflectors slow down the gases and fumes and protect the catalyst block against falling soot and particle. The invention is particularly intended for manufacturers of domestic combustion heating appliances, in particular those using wood.

Abstract: A heater apparatus mounted on a tabletop using an existing hole in the tabletop, such as an umbrella hole, includes a clamp shaft shaped for insertion through the hole. A clamp plate extends generally radially from the clamp shaft. An energy supply line, such as an electrical cord or a fuel hose, extends from a heating unit above the tabletop through an axial bore in the clamp shaft to a location below or near the table for attachment to an external energy source such as an electrical outlet or a fuel tank. One or more clamp plates may be positioned on the clamp shaft to stabilize the heating apparatus by applying a clamping force against the tabletop. A clamp fastener may also be disposed on the clamp shaft for applying a clamping force against the table between the clamp plates.

Abstract: A diagnostic system for an oven chamber, an oven system, and a method of wirelessly monitoring item temperature in an oven chamber are disclosed. In some embodiments, a temperature sensor used for sensing the temperature of an item is moved or transported with the item by a conveyor system. Also, in some embodiments, a wireless transmitter coupled to the temperature sensor can transmit a temperature signal to a receiver located outside of the oven chamber, and can also be moved or transported with the item. Data representative of item temperature can be stored, displayed, and/or used to modulate operation of the oven in some embodiments.

Abstract: A field ration packaging assembly includes a ration housing and a food tray. The ration housing includes a lid panel having at least one air exhaust vent and a wall panel having at least one intake vent. The food tray may be positioned above a heat source. The at least one air exhaust vent and at least one air intake vent may be in fluid communication such that upon activation of the heat source, air enters the ration housing through the at least one air intake vent, passes over the heat source and exits the ration housing at the at least one exhaust vent by natural convection.

Abstract: A heater assembly can be used with a gas appliance. The gas appliance can be a dual fuel appliance for use with one of a first fuel type or a second fuel type different than the first. The heater assembly can include at least one pressure regulator, a housing, and an actuation member. The housing has a first fuel hook-up for connecting the first fuel type to the heater assembly, a second fuel hook-up for connecting the second fuel type to the heater assembly, and an internal valve. The actuation member can control the position of the internal valve based on whether the first or the second fuel hook-up is used.

Abstract: A heating system can include certain pressure sensitive features. These features can be configured to change from a first position to a second position based on a pressure of a fuel flowing into the feature. These features can include, fuel selector valves, pressure regulators, burner nozzles, and oxygen depletion sensor nozzles, among other features.

Abstract: One aspect provides a heating device comprising a firebox having a hearth therein and first and second heat exchange chambers, and a heat exchanging plate having a first surface and a second opposing surface. The heat exchanging plate is suspended above the hearth, such that the first surface is located between the hearth and the second surface. The heat exchanging plate has lower protrusions extending from the first surface and into the first heat exchange chamber, and upper protrusions extending from the second surface and into the second heat exchange chamber. A method of manufacturing a heating device is also disclosed.

Abstract: The invention relates to a wood pellet stove, comprising a feed device for automatically adding wood pellets in a metered manner from a pellet hopper belonging to the stove. Said pellet hopper having the feed device and a grate is accommodated in a lower, stationary stove part (20), which remains cold and does not become hot during operation. The combustion chamber having a chimney connection is accommodated in an upper stove part (21). The upper stove part (21) is supported on the lower stove part (20) by means of a turntable so that the upper stove part can be swiveled relative to the lower, stationary stove part (20). Thus, the combustion chamber and the viewing window can be swiveled in any desired direction as needed.

Abstract: A thermal processing furnace, comprising: a generally bell jar-shaped outer reaction tube having a central axis; and an open-ended inner reaction tube for accommodating a wafer boat holding a plurality of substrates, which inner reaction tube is substantially coaxially disposed within the outer reaction tube, thereby defining a gas passage between an outer wall of the inner reaction tube and an inner wall of the outer reaction tube, wherein at least one of the outer wall of the inner reaction tube and the inner wall of the outer reaction tube is provided with a flow deflector that protrudes radially from the respective wall into the gas passage.

Abstract: A dual fuel heater can couple with one of two fuel sources operating at different pressures. The dual fuel heater can have a first fuel line, a second fuel line, a fluid flow controller, and a combustion chamber. The fluid flow controller can selectively permit flow of a first fuel to either the first fuel line or flow of a second fuel to the second fuel line. The first fuel line can be in communication with a first oxygen depletion sensor orifice and the second fuel line can be in communication with a second oxygen depletion sensor orifice.

Abstract: A portable fire pit system is disclosed having an outer shell that is configured for easy customization that the outer appearance of the fire pit can be changed. The outer shell includes at least one visible outer side wall that is substantially vertical and substantially smooth for receiving decoration. According to one embodiment the outer side wall is substantially cylindrical and has a decorative wrap attached to its outer surface.

Abstract: A wood burning furnace providing, in sequential connection, an air box, a fire box with a wood storage box/primary combustion chamber and a secondary combustion chamber separated by an ash grate, a heat exchanger, an exhaust manifold, and a smoke stack. The air box has an input port attached to an intake air blower. The air box also has two dampers, a thermostatically controlled first damper providing controlled access to an updraft exhaust pipe connected to the smoke stack. The second damper provides controlled access to the wood storage box/primary combustion chamber.

Abstract: The present document describes a multistages combustion furnace system for thermal expansion of mineral particles which comprises: a furnace having an expansion chamber for receiving the mineral particles; a burner head to be connected at a distance for an atmospheric coupling of the furnace and for operating the multistages combustion furnace system; a furnace device to be connected at a distance for an atmospheric coupling of the burner head to offset the quenching effect of ambient air normally drawn in the furnace; and a tuyere for thermal expansion of mineral particles to be connected between the expansion chamber and the furnace device; wherein the multistage combustion furnace system is to be connected with an inlet of preheated air.

Abstract: The present invention may be embodied as a biofuel heating system for converting biofuel to heat energy to be delivered to a load comprising a combustion chamber defining a combustion zone, an under-fire zone, and an over-fire zone. A controller operates at least one of a fan, an under-fire damper, and an over-fire damper based on at least one operating parameter such that air flows along a flow path extending from at least one of an under-fire port and an over-fire port, through the combustion chamber, through a burn-out port, through a burn-out chamber, through a heat exchange port, through a heat exchange chamber, and out of an exhaust port. The heat exchange system transfers heat energy from air flowing through the heat exchange chamber to the working fluid.

Abstract: A furnace comprising both overall heating means and local heating means for generating both an ambient temperature and local heating of the specimen so as to be able to simulate a mechanical shock. It therefore lends itself to various tests capable of providing a better evaluation of the self-heating or self-ignition characteristics of a material subjected to a thermal or mechanical stress.

Abstract: A catalytic tank heater includes a catalytic heating element supported on an LPG tank by a support structure that holds the element in a position facing the tank. Vapor from the tank is provided as fuel to the heating element, and is regulated to increase heat output as tank pressure drops. The heating element is internally separated into a pilot heater and a main heater, with respective separate fuel inlets. The pilot heater remains in continual operation, but the main heater is operated only while tank pressure is below a threshold. Operation of the pilot heater keeps a portion of the catalyst hot, so that, when tank pressure drops below the threshold, and fuel is supplied to the main heater, catalytic combustion quickly expands from the area surrounding the pilot heater to the remainder of the catalyst.

Abstract: An improved cover for use in conjunction with a furnace in performing a heating operation on a workpiece includes a support and an emission apparatus. The emission apparatus advantageously is in the form of a ceramic layer that has an emissivity value greater than that of the surface to which the emission layer is applied. In other embodiments, an emission layer can be applied to both the heated and non-heated surfaces of a cover. The emission apparatus reduces costs due to one or more factors such as a less costly material requirement, a reduced heating requirement, and an increased service life.

Abstract: In a method of heating a structure, an interior space of a furnace is heated to an interior temperature which is greater than a desired temperature to which a structure is intended to be heated. The structure is then placed into the furnace while the interior space is at least at the interior temperature at all times. When the structure has been heated to the desired temperature, it can be removed from the furnace at the desired temperature which is lower than the interior furnace temperature.

Abstract: This claim is an improvement to existing and commercially available domestic heating systems which consist of an outdoor wood burning stove and boiler which recirculate hot water through radiators located inside an inhabited structure or domicile. The inventor proposes the efficiency and convenience of such ‘outdoor wood burning heating systems’ are substantially improved by the addition of a large storage tank for the heated water and an electronic control system. The claimed improvement allows the firebox to be stoked and ignited at a time convenient to the dwelling occupant. Heated water is stored in an insulated water tank until called upon for heating. Combustion is optimized for maximum efficiency and atmospheric emissions are substantially reduced.

Abstract: The silicon heating furnace is constructed by combining two semi-cylindrical furnaces. Each of the semi-cylindrical furnaces has a semi-cylindrical housing, an insulator, heaters, and an isothermal material. Radial direction separation preventing members are arranged in inner side of both ends of circumferential direction of the housing to prevent a separation of the insulator to radial direction. End face of circumferential direction covers are fixed on the radial direction separation preventing members to cover the end faces of circumferential direction of the insulator. Cooling pipes for end faces of circumferential direction through which cooling water passed are arranged between the end faces of circumferential direction of the insulator and the end face of circumferential direction covers.

Abstract: A furnace unit that comprises a burner assembly having at least one burner located therein and a heat exchanger having at least one continuous combustion tube. One end of the combustion tube has a first opening that is coupled to the burner assembly. The combustion tube has at least three zones. A first surface of the first zone has a first non-straight angle with a second surface of the second zone. The second surface has a second non-straight angle with a third surface of the third zone. The first zone is nearest of the three zones to the burner assembly and the second zone is in-between the first zone and the third zone. The first, second and third zones are within a flame length configured to be emitted from the burner.

Abstract: A method for producing a nitride semiconductor laser light source is provided. The nitride semiconductor laser light source has a nitride semiconductor laser chip, a stem for mounting the laser chip thereon, and a cap for covering the laser chip. The laser chip is encapsulated in a sealed container composed of the stem and the cap. The method for producing this nitride semiconductor laser light source has a cleaning step of cleaning the surface of the laser chip, the stem, or the cap. In the cleaning step, the laser chip, the stem, or the cap is exposed with ozone or an excited oxygen atom, or baked by heat. The method also has, after the cleaning step, a capping step of encapsulating the laser chip in the sealed container composed of the stem and the cap. During the capping step, the cleaned surface of the laser chip, the stem, or the cap is kept clean.

Abstract: A method of determining an amount of impurities that a contaminating material contributes to high purity silicon comprises the step of partially encasing a sample of high purity silicon in the contaminating material. The sample encased in the contaminating material is heated within a furnace. A change in impurity content of the high purity silicon is determined after the step of heating, compared to an impurity content of the high purity silicon prior to the step of heating. A furnace for heat treating high purity silicon comprises a housing that defines a heating chamber. The housing is at least partially formed from low contaminant material that contributes less than 400 parts per trillion of impurities to the high purity silicon during heating at annealing temperatures for a sufficient period time to anneal the high purity silicon, and the furnace contributes an average of less than 400 parts per trillion of impurities to the high purity silicon under the same heating conditions.

Abstract: A portable heater includes a housing having an access door providing for receiving a fuel tank within the housing. The access door provides for insertion and removal of the fuel tank through the door. A burner within the housing is connected to the fuel tank and emits a flame above the housing. A vertical transparent tube extends above the burner and encompasses the flame along an entire height of the tube. A protective grill surrounds the tube and extends at least as far as the top of the protective grill. An upper cover assembly mounts to the top of the protective grill. The flame is enclosed extending up the tube along the entire height of the tube and creates a glowing vertical element from the housing to the cover.

Abstract: A heat treatment apparatus has a substrate holder with two holder constituting bodies that each have a plurality of columns and substrate holding sections. One of the holder constituting bodies holds substrates so that their front surfaces face upward, while the other holds the substrates so that their back surfaces face upward. At least one of the holder constituting bodies moves vertically to change the positions of the holder constituting bodies relative to each other. A distance between one of a first pair of vertically-adjacent substrates with respective front surfaces facing each other and the other of the first pair of substrates is set to ensure treatment uniformity and to be larger than a distance between one of a second pair of vertically-adjacent substrates with their respective back surfaces facing each other and the other of the second pair of substrates.

Abstract: A Patio Heater Side Heat Director is disclosed. The patio heater side heat director attachment is attachable to a conventional patio heater so that the dome attachment hangs down from the heater's heat shield on one side. The side heat director is designed to reflect incident heat/energy on one side of the heater towards the opposing side of the heater. The side heat director defines two or more lobes that assist in focusing the energy reflected by the director. The side heat director is easily attached to a conventional patio heater, by clipping or crimping the heat director to the edge of the patio heater heat shield. Finally, the side heat director attachment has a very low thermal mass so that very little heat energy is retained by the side heat director attachment, such that the largest possible percentage of the heater energy is reflected towards the seating area.

Abstract: A pellet stove utilizing gravity feed and natural draft more effectively and efficiently burns pellet fuel while producing less air pollution and ash. In one embodiment, the pellet stove has a primary combustion area comprising a burn unit removably disposed in the vent tube, a feed tube defining a fuel chamber above the burn unit and a secondary combustion area, comprising a burn box defining a secondary burn chamber, below the burn unit. The burn unit has a removable receptacle which defines a primary burn chamber that receives pellet fuel from the fuel chamber and discharges substantially burned fuel to the secondary burn chamber for additional burning. Openings in the burn box, pellet receptacle and vent tube draw air into the burn chambers. A control mechanism controls the air flow to regulate the heat generated by the pellet stove. The pellet stove can be manufactured in various aesthetically pleasing designs.

Abstract: A method is provided for regulating the output of a solid fuel furnace having primary and secondary combustion chambers arranged adjacent to each other, in particular one above the other or side by side, and are separated from each other by a partition in the floor or wall but are nevertheless connected to each other by at least one partition opening. The secondary combustion chamber is connected through a secondary exhaust-gas channel to a flue-gas passage, and the primary combustion chamber is connected to the flue-gas passage by a transition opening, wherein the transition opening can be closed at least partially by a flue-gas flap. Both a primary air supply and a secondary air supply are provided. A first temperature sensor is arranged in the secondary exhaust-gas channel and controls the primary air volume flow as a function of the temperature in the secondary exhaust-gas channel, while the secondary air volume flow is held substantially constant.

Abstract: A temperature sensor for a burner comprises two metal wires implementing a thermocouple, a protection sheath receiving the two metal wires, and a head in metal material having a front side intended to be facing the environment, the temperature of which is intended to be measured, and a rear side opposite the front side, in which the two metal wires are connected in a thermal exchange relationship to the head rear side, and the head comprises a front portion connectable to a burner wall of the burner so that the thermocouple is connectable to the burner by means of said metal head.

Abstract: Disclosed is a heat treatment method including a step of placing a wafer W provided with a low-k film and a metal layer in a heat treatment furnace 41, a step of supplying gaseous acetic anhydride into the heat treatment furnace 41, while controlling the flow rate using a mass flow controller 44d, and a step of heating the wafer W in the heat treatment furnace 41 supplied with gaseous acetic anhydride by using a heater 41b provided in the heat treatment furnace 41.

Abstract: The instant invention is a heat reclaimer that is positioned within the chimney of an existing outdoor wood stove. The reclaimer is heated by the waste heat leaving the combustion chamber of the outdoor wood stove. This waste heat is captured in the reclaimer by heating water inside the reclaimer then recirculating that water to the existing outdoor wood stove raising the temperature of the return water in that outdoor wood stove and thereby increasing the efficiency of the outdoor wood stove. The device maximizes the efficiency for specific heating outdoor wood stoves by extracting BTUs from waste or lost flue gases through a safe and environmentally sound practice. The device saves substantial amounts of resources as well as time gathering and preparing the fuels.

Abstract: A venting system for a biomass burning appliance. The system includes at least one pipe element formed of a steel alloy comprising: a maximum of 0.025 weight percent of Carbon, a maximum of 1.0 weight percent of Manganese; a maximum of 0.030 weight percent of Sulfur; a maximum of 0.1.00 weight percent of Silicon; a maximum of 0.035 weight percent of Nitrogen; a range of 17.50-19.50 weight percent of Chromium; a maximum of 1.00 weight percent of Nickel; a range of 1.75-2.5 weight percent of Molybdenum; and a range of a combination of Titanium+Columbium having a minimum of percentage of 0.20+4×(C+N) and a maximum of 0.80 percent.

Abstract: A wireless damper control device comprises a damper positioned in a flue, movable between a closed position where the flue is blocked and an open position, a damper controller which sends a damper signal which moves the damper between the open position and the closed position, and a fire side controller which transmits a fireplace signal to open a gas valve to initiate combustion when a fire is desired at a fireplace, and to close the gas valve to terminate combustion when a fire is no longer desired at the fireplace, and which receives a damper status signal from the damper controller indicating whether the damper is in the closed position or the open position.

Abstract: Disclosed is in combination, a stove and a thermoelectric generator, wherein the stove has a heating chamber and the generator has a hot side plate positioned in use within the heating chamber in a direct path of the heat therefrom. The generator may be incorporated with a door of the stove. Preferably, the generator has a cold side plate positioned in use to be exposed to ambient air close to the ground. The cold side plate may comprise cooling fins and the cooling fins may be positioned to be exposed to ambient air close to the ground. The generator may further comprise a protective mechanism to protect the generator from overheating, such as a grillwork guard or a shutter that closes to block the direct heat from the generator mechanism. The stove may be a wood stove or a coal stove. Generated power can be used to power cooling fans, charge an energy storage device and/or power external devices such as lights, fans or radios for example.

Abstract: A portable pellet fired heating element for mounting to a grill or stove and comprising a gravity fed pellet holder, a unitary tubular structure having a burner, an air intake and an exhaust chute. Fuel may be supplied to the pellet holder by various supply means such as a conveyer, ramp, scooped, held in bulk in a hopper, and like pellet supply structures and methods. Fuel is fed to the air-cooled insulated burner area onto a decomposer grate, which defines the primary combustion area and which is partially open to the atmosphere for air intake. An adjustable high-pressure flow of gas or vapor is introduced to the primary exhaust chute below the decomposer grate to create a low pressure flow above the grate and which upon ignition, cause flames to be pulled into the pellet mass on the grate.

Abstract: A heating stove for burning a gelled alcohol fuel is provided which is constructed of cast iron, yet nevertheless, is compact and light enough for one person to move. The stove is constructed of a minimum of parts, with a duplication of some parts, to minimize production and assembly costs and time. The stove provides for visibility of the burning flame of the fuel and yet confines the flame for safety considerations.

Abstract: A personal heating device includes a chamber having a closed end and an opposing open end. One or more air intake holes are formed in the chamber proximal the closed end to allow air into the chamber. One or more vent holes are formed proximal the opposing open end to allow air to exit the chamber. A heat source disposed inside the chamber holds generates heat, and a cap slidably covers the chamber open end to hold in the heat and regulate the air exiting the vent holes.

Abstract: A charcoal igniter which has a thermal barrier attached to the top of the charcoal ignition chamber. The thermal barrier restricts airflow though the charcoal chamber and retains heat within the chamber to accelerate the burning process. The thermal barrier is perforated to allow air to flow through at a reduced rate to retain hot gas from ignition within the charcoal chamber. The thermal barrier may contain thermally resistive material, such as granulated or crushed lava roc which both retains heat to accelerate the ignition and improves safety by filtering exhaust gases to prevent ash and sparks from escaping. The thermally resistive material also acts to re-radiate heat back into the charcoal chamber to further accelerate the ignition of the charcoal. The charcoal igniter has a central charcoal chamber to hold charcoal and a top mounted thermal barrier to prevent heat from escaping.

Abstract: A particulate waste wood fuel comprising wood particles comprising less than 20% water by weight and having a particle size distribution suitable for combustion of the particulate wood fuel in a particulate fossil fuel suspension furnace. A method for making the particulate wood fuel includes shredding of waste wood and drying the shredded waste wood to obtain the desired particle size distribution and water content. A method for producing energy comprises injecting the particulate wood fuel into the combustion chamber of a particulate fuel suspension furnace separately from a particulate fossil fuel which is also injected into the combustion chamber. The particulate fossil fuel and particulate wood fuel are combusted in the combustion chamber in a gas flow through the combustion chamber to form a flame in the gas flow. The wood particles are substantially completely combusted within the combustion chamber while suspended in the gas flow and are not combusted at the furnace wall.

Abstract: The space heating system has a stove (1, 2) with a sealed combustion chamber (3); air is heated in the stove in a heat exchanger (12) therein, and heated air is conducted through hollow blocks (80) of chamotte arranged, for example, as heating panels, heated walls, benches, floors or the like. The hollow blocks are formed, internally, with projections or obstructions (83) to increase heat transfer, and may be faced at the outside with decorative tiles. To seal the combustion chamber, a vertically movable panel, typically of fire-resistant glass, is slidably located in front of a fuel inlet opening (7). In operation, the panel is sealed, so that the combustion chamber (3) will receive air only under controlled conditions, in two air paths; a primary air path supplies air to a narrow space (22) below a fuel support grate (25), after being preheated by passing around an ash receiver (18); and a secondary air flow, passed through ducts (30) within the combustion chamber, and ejecting air towards the panel.