Abstract: A compact hydronic space and water heating apparatus and system is disclosed for use in a recreational vehicle. A liquid heating medium, stored within a low pressure tank, is recirculated through a gas fired heater thereby maintaining a desired set point temperature. The liquid heating medium is further circulated through the vehicles hydronic space heaters to heat the interior of the vehicle. Further fresh domestic water is passed through a heat transfer coil within the tank whereby hot domestic water may be provided. An auxiliary heating device is attached to the tank whereby hot combustion engine coolant may assist in maintaining the temperature of the liquid heating medium within the tank and/or reversed to pre heat the combustion engine if and when needed.

Abstract: A burner has a burner tube and a nozzle holder mounted in one end of the burner tube. An igniter is positioned within the nozzle holder and acts to ignite any of the multi-liquid fuels which may be used with the burner. A nozzle emits atomized liquid fuel under the venturi effect of the nozzle with compressed air being supplied to the nozzle. Primary air holes extend circumferentially around the nozzle holder to admit air radially which passes directly to the burner tube. Secondary air holes extend around the inside circumference of the burner tube on the secondary air injection plate and admit air axially to the burner tube.

Abstract: A thermal protective barrier is provided for space heating units in the form of a relatively thin panel having an interior volume filled with a non-combustible liquid (water and/or antifreeze mix, etc.). Two of the embodiments are flat and are adapted to be placed beneath and about the sides of a stove or other heating unit, with a third embodiment having a toroidal cross section and being adapted for installation about the flue of such a stove or heater. Additional structure may be installed within the panels to provide additional support, as required. The panels may be removably installed between the stove and adjacent walls and the underlying floor, or may be permanently installed integrally with the building structure. The panels may also include decorative coverings for exposed surfaces, if desired. The panels may be independent of other water or fluid systems, or may be interconnected with a water heater or hot water heating system, if desired.

Abstract: A tent supported by a center pole in which the center pole serves as a chimney for a stove disposed within the tent. A water jacket surrounds the center pole for heating water stored in the water jacket. The center pole is formed from pole segments with are nested on top of another through a slip fit connection, whereby the center pole can be disassembled for transporting and storing.

Abstract: A preheater for a conventional gas-fired water heater having an outer container, an inner reservoir, water conduits in fluid communication with the reservoir and openings in the outer container allowing the through passage of hot exhaust flue gas from a conventional hot water tank to have an increased residence time with respect to the reservoir for efficient heat transfer of the hot flue gases. The heated water is fed from the preheater to the hot water tank on demand. The preheater is placed atop the hot water tank to receive the hot flue gases therefrom.

Abstract: This invention relates to method and apparatus used as an addition to any existing heating system--burning any fuel--for heat recovery from stacks and chimneys. It uses a suitable heat exchanger mounted at the apex of such stacks, by virtue of which location no natural draft is lost. The system includes a circulating pump, a thermostat, an expansion bottle, a condensate trough, a cap and dome which jointly serve to act as unloaders to protect the system liquid from being boiled off. Both sensible heat and the latent heats of moisture in the fuel and in the vapor produced as a combustion product, can be scrubbed out. The use is to effect economies and to reduce environmental contamination wherever fuels are fired.

Abstract: An automatic flue gas heat recovery system for supplementing or replacing a conventional, separate hot water system. In the example described, the heat recovery system is applied to a pizza restaurant where large quantities of heat energy are normally wasted up an oven chimney stack, and large quantities of hot water also are required for restaurant operations. An electric motor driven pump circulates water in a closed loop between a storage tank and a heat exchanger tube located in the oven chimney stack. A thermostat control automatically starts the pump when the oven heats the chimney stack to an effective water heating temperature. When temperature in the storage tank reaches a predetermined maximum, the thermostat control stops the pump, opens a drain valve, and dumps water quickly and completely from the heat exchanger tube. Three different embodiments are shown and described illustrating systems with one or more storage tanks and one or more pumps.

Abstract: A hot water boiler having a dual combustion chamber arrangement capable of burning either solid or fluid fuels, and arranged for acting directly on a heat transfer system generally in direct contact with firebox walls of the combustion chamber arrangement. Disposed atop the combustion chamber arrangement is a heat conserving flue assembly which absorbs heat from smoke and flue gases exhausted from the combustion chamber arrangement and heats a fluid medium which in turn is circulated to the heat transfer means for eventual release for circulation or storage as desired in a residence or other building structure.

Abstract: The present invention provides a heating appliance which comprises a combustion chamber, a boiler adjacent the combustion chamber, and a flue system for conveying combustion gases from the combustion chamber. The flue system has two different routes for conveying combustion gases and a damper which may be selectively positioned to cause the gases to pass predominantly along either one or the other route. This arrangement permits the heat output to the boiler and an associated cooker unit to be varied while a constant firing rate is maintained in the combustion chamber. The applicance is preferably operated on solid fuel.

Abstract: Apparatus interposed in a smoke flue between a furnace and a chimney for recovering energy from smoke and heating water therewith. A tank contains a volume of water to be heated. A water inlet and a water outlet supply cold water to the tank and discharge heated water. A plurality of heat exchanging tubes extends through the interior of the tank such that the ends communicate with opposite exterior surfaces of the tank or extend outwardly therefrom. A plurality of sleeves, one for each tube, has an outside diameter slightly less than the inside diameter of the tubes such that each sleeve is positioned within one of the tubes in concentric manner and sealed to the ends of the tube to define an annular air space there-between. Expanding and reducing elements provide gaseous communication between the flue and the plurality of sleeves.