Abstract: A modular fireplace assembly which comprises a hearth, a firebox around and over the hearth, and an air plenum chamber on opposite sides and to the rear of said firebox in heat transfer relation thereto. A plurality of environmental comfort conditioning subassemblies are removably positioned in a portion of the air plenum chamber to the rear of the firebox, and include a fan subassembly, an air conditioning coil subassembly, and a heater subassembly. A stack extends upwardly from the upper side of the firebox in heat exchange relation to a hot water tank positioned over the firebox. Air conveyance ducting is connected to the upper side of the air plenum chamber, and air return ducts are connected to the lower side of the air plenum chamber.

Abstract: An attachment or, accessory water heater being installed in any furnace flue, or pipe giving off an exhaust heat. When installed in a flue or pipe and connected in conjunction to any type self-sufficient water heater tank. It is the purpose of this invention, to use the heat which escapes up the flue from the furnace during operation. Thus eliminating in most cases, and drastically reducing in others, the need for additional energy, which is normally used to heat water. The accessory heater is essentially a condensed unit, which divides water into multiple and smaller parts, comprising a conduit of two sizes, being formed and shaped into condensed spiral coils, and connected to rings or headers, and circulating water through the unit and back to the tank, by means of convection or pump.

Abstract: The invention as disclosed in the following specification, relates to a heat exchanger, having tubes fitted into plates, that exchange heat from a gas passing thereover to fluids passing through the tubes. The heat exchanger is particularly adaptable to boilers having fire tubes and other types of boilers wherein the heat applied to the tubes is circulated and then exhausted. Prior to exhaust, the heated gas is passed over the plates in a duct. The tubes in the plates are used to pick up the heat from the exhaust gases by means of the feed water passing through the tubes, or the tubes can be used to directly heat other fluids, such as oil and service hot water. A damper is placed over the normal exhaust gas flue in conjunction with a second damper or duct control system whereby an exhaust fan on the downstream side of the heat exchanger duct provides a constant draw to allow the boiler to operate within its normal pressure ranges.

Abstract: This invention is a device for use in increasing the efficiency of existing heating units. This heat exchanger consists of conduits for channeling the furnace or wood stove exhausts in an extended pattern. Cold air is pumped into the heat exchanger at a point at which the exhaust smoke is released up the chimney. The cold air is channeled around the smoke containing flues by a thermostatically-controlled fan and baffles found in the heat exchanger. This air exits the heat exchanger at a point at which the smoke enters it. This heat exchanger puts out temperatures in excess of 450.degree. F. As depicted in the preferred embodiment, only by way of example, the heat exchanger is extremely lightweight and made of galvanized steel with caps at either end to facilitate cleaning.

Abstract: A heating coil in a firebox above a burner is connected to a hot water radiator positioned between the firebox and a hot air outlet. A usual short flue pipe between the firebox and a draft diverter is replaced by a plurality of longer flue pipes of smaller diameter spaced above the firebox for transferring heat to air that is flowing to space that is being heated.

Abstract: A water heating system comprising an exhaust gas water preheating coil supplying water via a storage tank to a water heating boiler.

Abstract: A heat exchanger is provided having coiled tubing and radiating fins about which hot flue gases for the cooking equipment circulate to heat a medium passing therethrough. Temperature control valves are selectively adjustable to pass the heated water along either of two sets of conduits for heating makeup air or heating water for use in the facility, respectively. These temperature control valves are set so that when the ambient room temperature is less than 70.degree. F., the medium heated by the flue gases is passed through a second heat exchanger which intercepts incoming air to warm it before its admission in the building. When the temperature exceeds 70.degree. F., the valves automatically switch to direct the heated medium to a third exchanger for heating tap water. A bypass arrangement recirculates the heat carrying medium through the primary heat exchanger until it achieves a predetermined temperature to prevent condensation.

Abstract: A tubular coil for circulating liquid extends upwardly at least partially the length of a chimney to absorb heat from the hot combustion gases emitted by a fuel combustion chamber in a heating furnace. This coil is connected to a heat exchange device, such as a radiating unit to supply heated fluid, such as hot air in a hot air furnace. In the principal form of the invention, the radiating unit supplied by heated fluid from the coil is positioned in the air circulated by the hot air heating system.

Abstract: In combination with a heating system comprising a boiler, combustion means for heating water contained in the boiler and a flue for conducting away hot gases resulting from the combustion, the invention comprises a system for recovering heat contained in the flue gas comprising a housing having a flue gas inlet and a flue gas outlet, contained in the housing a coil having a water inlet and a water outlet, director means for directing flue gas into a first path of contact with the coil as the flue gas travels from the flue gas inlet to the flue gas outlet or a second path directly from the flue gas inlet to the flue gas outlet without contacting the coil and means for adjusting the directing means between a first position at which the flue gas is directed into the first path and a second position at which the flue gas is directed into the second path.

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.

Abstract: A novel and easy method of construction and assembly which enables a tubular coil to be inserted in an open flue pipe so the flue pipe can be joined; water passing through the coil will recover waste flue heat from furnaces and boilers.

Abstract: A water heating system includes a boiler which is connected with a source of water supply for receiving water under pressure. An exhaust flue is connected to the boiler for the discharge of gaseous products of combustion. A pair of concentrically arranged coils is positioned within the exhaust flue and is connected with the conduit feeding water to the boiler. A recycle loop is thus provided for withdrawing a minor portion of the water being fed to the boiler and for recycling same at a higher temperature to the feed conduit. The water circulates within the loop by natural connection.

Abstract: A combination heat exchanger and blower unit suitable for connection into the breeching between a heater and the stack to admit hot flue gases into the unit. The flue gases enter a fan section wherein the hot flue gases and recirculated gases within the unit are accelerated by a fan. A helical coiled tube heat exchanger is positioned within the unit and is bombarded by the gases which are discharged by the fan. The turbulence created within the unit causes the heated gases to impact upon and to pass between the heat exchanger coils many times at high pressure. The repeated impacts of the heated gases upon the tube heat exchanger breaks down the boundary layer of stagnant gas surrounding the heat exchanger coils and results in greatly increased heat exchange efficiency.

Abstract: A heat exchange system for exchange between fluids such as water and air as in a heat recovery system in which a first fluid is passed through a first conduit which may be in the form of pipes and a second fluid such as air is passed through a second conduit that surrounds the first and including baffles for directing the second fluid in heat exchange contact flow between the spaced pipes and back into the air conduit. At least one of the baffles is shaped to be flow diverting to divert the flow of the second fluid laterally over the first conduit and back toward the center of the second conduit so as to provide an undulating flow.

Abstract: An auxiliary water heating tank to be employed in combination with a conventional tank water heater which is gas fired and supplies heated flue gases to the ambient, the heated flue gases from the water heater to be supplied either into a flue pipe centrally located within the auxiliary heater tank or into a chamber surrounding the auxiliary heater tank, the first embodiment employing a plurality of heat conducting members extending transversely through said flue pipe with the ends of such extending within the auxiliary heater tank, the heating conducting members arranged in a spiral pattern throughout said flue pipe, the members adapted to conduct heat energy from said flue pipe into water contained within said auxiliary heater tank, the second embodiment employing heat sinks and the principle of thermosyphon to efficiently heat the water, the third embodiment conducting the exhaust gases of the water heater into a chamber totally encompassing the auxiliary heater tank.