Abstract: A portable water heater for use in outdoor activities improved in thermal efficiency. The heater has a double-layered structure, i.e., is constituted of an outer housing, an inner heated vessel, and a gas burner at the bottom thereof. A thermal insulation layer is formed between the housing and the heated vessel sufficient to permit therebetween an upward flow of a combustion gas from the burner to an air outlet located at the top of the heater, thereby heating the vessel. Instead of the thermal insulation layer, a thermal insulation plate in a crimped shape may be interposed between the housing and the heated vessel, so that the thermal efficiency in heating the vessel is further enhanced. The internal heated vessel may be integrally fabricated with the outer housing, or may be arranged to be removable from the housing or the internally disposed crimped plate. The crimped insulation plate may also be shaped either triangularly or sinusoidally.

Abstract: The temperature of localized high temperature regions in the side panels of a kitchen range is reduced by the use of thermal conduction breaks to interrupt thermal conduction paths and inhibit the transfer of heat from the oven through a supporting frame to the side panels. The thermal conduction breaks comprise a plurality of thin, vertically orientated elongated slits in upper portions of the front faces of the side panels. Heat transfer into the side panels due to radiation from the oven door is reduced by forming the oven door with a plurality of elongated slits disposed about a central portion of the door which closes the oven access opening to interrupt thermal conduction paths from the central portion to peripheral regions of the door adjacent to front faces of the side panels.

Abstract: The invention is concerned with a cooking range, especially suitable for mobile homes, which utilizes gas burners, where the exhaust gas draft is held substantially constant and the exhaust duct temperature is kept below a critical temperature by providing temperature-regulated cool air openings on the exhaust gas duct. Reliable regulation is accomplished by closures controlled by bimetallic springs positioned in a swivelable manner in the cool air openings so as to act on the closure flaps, and the closure action further improved by restoring springs exerting pressure on the outside of the closures.

Abstract: A system for mechanically attaching two layers of ceramic fiber material is disclosed. Each layer of ceramic fiber material contains one or more ceramic tubes which are parallel to the interface formed between the layers. Each ceramic tube in one layer is aligned with a ceramic tube in the other layer and ceramic links interconnect the aligned pairs of ceramic tubes forming a mechanical attachment between the layers of material.

Abstract: A heating appliance which burns solid fuel has a bottom feed to a furnace vessel, conveniently by means of an auger. The furnace vessel is arranged to be driven in rotation which assists keeping a uniformly distributed fire in the furnace vessel, and makes possible the discharge of ash overflowing from the top of the vessel through an airlock system. Preferably, a water jacket surrounds the furnace vessel and a poker is moved in the furnace vessel as it rotates. Combustion air can be blown or sucked in by a fan. The heating appliance can be a domestic cooker, also heating water for central heating.

Abstract: An outdoor cooking device capable of sustained use at elevated temperatures caused by the burning of mesquite charcoal, and the like. The device includes a plurality of liner sheet sections and a cooperative burning grate which form an inwardly spaced protective barrier adjacent the firebox side walls and bottom wall. The liner sheet sections and burning grate are independently removable and replaceable and cooperate to prevent heat degradation, or burnout, of the firebox which might otherwise result from cooking at the high combustion temperatures of mesquite charcoal, and the like.

Abstract: A baking oven comprising a hot-air circulating heating system by which hot air is heated and circulated through a baking chamber from a heating and circulating device arranged above the baking chamber. The heated air contacts the articles to be baked which are present in a multi-tier rack in the baking chamber. The baking chamber is defined by a housing which is formed of several sections and includes a cover, a floor and vertical walls. The walls are provided with insulation which is covered by a cowling. In the front wall is an opening which extends from the floor to the cover for the introduction and removal of the rack. The opening can be closed by a door. The housing is composed of a plurality of segments of the same outer contour which are stacked on one another, the uppermost segment containing the cover and the heating and circulating device, the lowermost segment containing the floor, the vertical walls being formed by at least two segments.

Abstract: The specification describes a combination wood burning stove and oven comprising a housing having a combustion chamber, a heat transfer chamber and an oven disposed in the heat transfer chamber, a combustion product intake opening means communicating the combustion chamber and heat transfer chamber, a combustion product outlet opening in the heat transfer chamber for connection with an exterior flue pipe and an interior flue pipe means disposed in the heat transfer chamber adjacent the oven and interconnecting the intake opening means and outlet opening, the interior flue pipe means serving as a heat exchanger for the transfer of heat therefrom to the oven.

Abstract: A water heater incorporating a cylindrical heat exchanger installed laterally in the lower part of a water tank. The interior of the heat exchanger has a plurality of circular baffles spaced transversely of the interior. An exhaust pipe covered with a heat insulator extends vertically from the heat exchanger to outside the water tank.