Two improvements for heaters are disclosed which can be implemented as either apparatus or method. First is a novel flue gas injection system. Second is a novel burner configuration. The improvements can be used alone or together. In the flue gas injection system, flue gas is injected between the burners and the tubes to reduce heat flux on the tubes and shift part of the heat duty from the radiant to the convective section. These approaches work toward increasing the capacity of heaters where w...

A heater is disclosed. The comprises a housing; a reflector; and a pair of opposite connectors supported by the reflector and configured to support opposite ends of a heating element. The reflector is movable between a plurality of positions relative to the housing.

An infrared heater includes a support body and a heat source irradiating device. The heat source irradiating device includes a reflecting hood, a hood body, two non-planar symmetric arc bodies disposed on the top surface of an n-shape body, a casing, and an infrared tube, such that a radiant heat at the upper half of the infrared tube can be radiated from an open end having an included angle from 60.degree. to 80.degree. from the hood body after the radiant heat is reflected from the two arc bod...

A light fixture (10) is provided having an upper housing (11), a light diffusor (12), a light source (13), and a heating source (14). The housing includes a mounting plate (17) adapted to be mounted to the ceiling of a structure in conventional fashion. The upper housing includes an upper wall, two oppositely disposed side walls (18), a bottom wall (19) spanning the side walls, and an annular airflow ring (21). The bottom wall has a central opening (23) therein. The airflow ring has a plurality ...

A humidifying and tempering apparatus for use in an oxygen delivery system and comprising a vessel, a supply of water in the vessel, a nebulizer in the vessel above the water, a supply of oxygen under pressure connected with the nebulizer, an elongate water conducting tube connected with the nebulizer and extending downwardly into and through the water, an elongate resistance heater element concentric within and extending longitudinally of the tube to heat that water drawn through the tube by th...

A beehive heater for installation between the lower brood chamber and the bottom board of a standard beehive for protecting a colony during the winter with a minimum of winter brood production and for accelerating spring brood production. The beehive heater provides an insulating curtain of heated air adjacent to the walls of the brood chambers. Air enters a plenum chamber where it is heated by a low temperature heating element and flows out of the plenum chamber through a series of holes locate...

Space heaters employing an omnidirectional infrared radiant burner are disclosed. Cylindrical in shape, the radiant burner includes an inner cylindrical mantle comprised of three concentric fine-mesh grids which are formed from flat mesh stock. The outer of the mantle grids has a seam which is bonded to form a continuous cylinder, while the inner grids each have the shape of a split O with an open break line therein. The inner two concentric mantle grids are inserted inside the outer bonded grid...

An apparatus for heating materials such as aluminum billets to a temperature suitable for extrusion is disclosed. The apparatus has at least two zones arranged in tandem, a preheat zone and one or more primary heating zones. Every zone has inner and outer chambers. The outer chamber is supplied with high temperature gas at a pressure in excess of that of the inner chamber. The chambers are separated by baffles which define narrow slot-like aspirating throats through which secondary gases from a ...

Apparatus and method for providing heat to a hot water storage system in which water from the storage system is circulated through a heat exchanger in the flue of a combustion heat source and circulatory flow is provided by a circulating pump in a secondary circulatory system including a heat exchanger having greater heat transfer capacity than the heat exchanger in the flue so as to dissipate excess heat at a controllable rate.

An electric heater having a ceramic core with a heating element surrounding the core and a jacket surrounding the heating element such that the heating element is secured to the jacket but there is no chemical bonding between the heating element and the core. In the method of producing the electric heater, the core is formed in an uncured state and then surrounded with the heating element. The heating element is surrounded by a jacket such that the heating element is secured to the jacket, and t...