Abstract: A vent attachment facilitates attaching a coaxial air intake and exhaust vent of a tankless water heater to a Category I vent, such as B-vent. The vent attachment comprises a first end with a coaxial connector comprising a central exhaust pathway and a circumferential air intake pathway. The vent attachment also comprises a second end with a tubular exhaust vent connector in fluid communication with the central exhaust pathway. The vent attachment further comprises a frame that encloses the central exhaust pathway and comprises a mesh configured to provide fluid communication through the frame with the air intake pathway. Additionally, operation of the tankless water heater is modified to ensure that the exhaust generated is suitable for venting through a Category I vent. The tankless water heater maintains a high fuel consumption rate such that the temperature of hot water produced increases throughout each of a plurality of burner stages.

Abstract: The present disclosure provides a cap and a water-heating device having the same. The cap for covering a top side of a case of the water-heating device includes a cover having a receiving space that is open at the bottom, the cover including an exhaust hole formed therein for releasing exhaust gas in the case to the outside, and an exhaust duct that is received in the receiving space and coupled to the cover and that forms an exhaust channel that connects an exhaust tube included in the case and the exhaust hole and releases the exhaust gas, in which the exhaust duct is formed of a material different from a material of the cover, and the material of the exhaust duct has higher heat resistance than the material of the cover.

Abstract: The present invention relates to a water system with a warm water line (3) for supplying at least one first consumer (4, 4a, 4b) connected thereto with warm water and a continuous flow heater (1), in which cold water introduced into the latter is heatable, connected to said warm water line (3). In case warm water remains in the continuous flow heater, because it is only partially consumed, limescale deposit can reduce the performance and the service life of the continuous flow heater. Limescale deposit is particularly likely to happen in stagnant warm water. The present invention aims to solve aforesaid problem in that a flushing station (2) connected to said warm water line (3) is provided, by way of which stagnant water in said warm water line can be drained in a chronological sequence until the water contained in said continuous flow heater (1) is below a predetermined setpoint temperature.

Abstract: In a preferred embodiment, there is provided a water heater venting assembly for directing a combustion air and a flue gas between an outdoor atmosphere and a water heater, and which includes a generally hollow housing defining a combustion air aperture, a flue gas exhaust conduit disposed in the housing, and an adjustable inlet duct coupling assembly having a retention member for placement in the housing proximal to the aperture, a gasket for placement around an outer periphery of the aperture and a combustion air supply member. The retention member is for retaining the supply member in fluid sealing engagement with the gasket to effect fluid communication between the aperture and the supply member, and is sized to permit slidable movement of the supply member relative to the gasket.

Abstract: The gas exchange termination assembly overcomes the affects of fluid turbulence caused by wind, drafts, and air pressure. The invention can be applied to gas burning devices under 4,000 BTU input. Turbulent flow of gases at the gas exchange termination assembly are mitigated by the location of slots and openings in the gas exchange termination assembly for both intake air and exhaust gases. The gas exchange termination assembly is connected, coaxially through the building structural wall, to a sealed combustion system in order that all gases are drawn from and return to the same general location (directly) outside the building. The gas exchange termination assembly includes an intake air hood for intake air with additional intake air openings, an exhaust pipe with slots and a plug to move products of combustion at angles to the concentric pipe as the intake and exhaust gases enter and exit.

Abstract: The present invention achieves energy saving and a decrease in facility cost for a hot water supply device by dividing a water receiving tank. A hot water supply system comprising: a water receiving tank receiving water supplied from a water supply source; a hot water storage tank connected to the water receiving tank via a connection pipe and storing hot water and supplying hot water to a hot water supply load; and a hot water supply device supplying the water stored in the hot water storage tank.

Abstract: A boiler comprises a boiler gas exhaust providing an exhaust for recuperated gases; and a secondary heat exchanger comprising: an economizer cold fluid inlet connected to a source of cold fluid; an economizer cold fluid outlet fluidly connected to the economizer cold fluid inlet and located thereabove, the cold fluid circulating upwardly from the economizer cold fluid inlet towards the economizer cold fluid outlet; a hot gas inlet for receiving the recuperated gases from the boiler gas exhaust; and a hot gas outlet fluidly connected to the hot gas inlet through the secondary heat exchanger, the recuperated gases circulating from the hot gas inlet toward the hot gas outlet; wherein the recuperated gases cross the secondary heat exchanger and exhaust by the hot gas outlet, the cold fluid being heated between the economizer cold fluid inlet and the economizer cold fluid outlet thereby resulting in a preheated fluid.

Abstract: A water delivery system is provided, comprising at least one faucet device with a cold water faucet part and a hot water faucet part, a cold water line to the at least one faucet device, a tankless heater device for heating water, a hot water line having a first portion running from an outlet of the tankless heater device to the at least one faucet device and having a second portion running from the at least one faucet device to an inlet of the tankless heater device, and a circulatory pump arranged in the second portion of the hot water line, wherein the circulatory pump has a prefixed first performance level and a prefixed second performance level, wherein the first performance level causes a finite water flow in the hot water line which is below an operation threshold value of the tankless heater device.

Abstract: An apparatus for heating water having three vertically aligned water heating process sections. The upper section includes an annular water storage tank disposed around a combustion chamber having a downward firing burner. The intermediate section, disposed vertically below the upper section receives flue gas from the combustion chamber, which flue gas is cooled and dehumidified, producing a hot condensate which collects in a passive condensate flow control device disposed proximate the bottom of the intermediate section. The lower section, disposed vertically below the intermediate and separated therefrom by the passive condensate flow control device receives hot condensate from the flow control device, which is used to preheat and humidify air, such as room air, which is then recycled to the combustion process of the upper section for use as combustion air.

Abstract: A water heater having primary and secondary heat exchanger and a pump to move water between the primary and secondary heat exchangers. The pump may also be used for the purpose of recirculating water within a building. The water heater may be manufactured with a method in which certain steps and components are added to a water heater of a first efficiency to arrive at a water heater having a second efficiency greater than the first efficiency. The additional steps and components may include attaching a condensing recuperator to a traditional power vent water heater.

Abstract: A method of sanitizing pipes, etc. in a hot water supply system includes the steps of normally heating water by driving water from a water storage tank, into a heat exchanger. Typically, a water pump is stopped once the water storage tank receives a particular percentage of hot water. However, when a sanitation mode is desired, the pump is not stopped, such that the water tank becomes all, or almost all, hot water. The hot water is then delivered to the pump, and from the pump to the heat exchanger. This hot water is thus operable to sanitize pipes and the pump.

Abstract: A water heater module of the present invention includes a water heater and an extra heat exchanger. The extra heat exchanger has a spiral pipe and is detachably connected to the water heater. The spiral pipe is heated by high temperature gas from the water heater to pre-heat cold water in the pipe, and then the water is sent to the water heater for further heating that the temperature of the water will be raised within a short time.

Abstract: A fuel reformer burner for a polymer electrolyte membrane fuel cell (PEMFC) system includes a first tube through which a fuel for a fuel reformer is supplied and a second tube through which anode-off gas (AOG) is supplied from a fuel cell stack. The second tube is not connected to the first tube, and an inlet line through which an air is supplied is connected to the first tube.

Abstract: The present invention discloses a heat transfer unit which integrates a boiler and a gas preheater for steam generation and gas preheating. In one embodiment, the heat transfer unit of the present invention may be used in fuel processing applications. In this embodiment, the heat transfer unit may be located downstream of a combustor such as an anode tailgas oxidizer.

Abstract: In a single can-type composite heat source machine including a single can body (2) including a first combustion section (3-1) having a first burner (4-1) and a hot water supplying first main heat exchanger (5-1) located above the first burner (4-1), and a second combustion section (3-2) having a second burner (4-2) and a second main heat exchanger (5-2) located above the second burner (4-2) and used for a purpose other than hot water supply, the first combustion section (3-1) and the second combustion section (3-2) being partitioned from each other by a partition wall (2a) and juxtaposed in a lateral direction, the machine including a first auxiliary heat exchanger (11-1) and a second auxiliary heat exchanger (11-2) both of a latent heat recovery type connected to upstream sides of the first main heat exchanger and the second main heat exchanger, respectively, an exhaust system can be miniaturized and simplified in spite of provision of the auxiliary heat exchangers.

Abstract: The present invention discloses a heat transfer unit which integrates a boiler and a gas preheater for steam generation and gas preheating. In one embodiment, the heat transfer unit of the present invention may be used in fuel processing applications. In this embodiment, the heat transfer unit may be located downstream of a combustor such as an anode tailgas oxidizer.

Abstract: A system and method for pre-heating water prior to entering a hot water heater is disclosed. The system includes: a cold water supply line; an ambient air heat exchange device positioned within an insulated area of a building wherein the ambient air heat exchange device is connected to the cold water supply line; and a fluid connected for interconnecting the ambient air heat exchanged device to the hot water heater, the ambient air heat exchange device being operable to: allow incoming cold water to enter the ambient air heat exchange device as required; permit the transfer of heat from ambient air within the insulated area to the cold water within the ambient air heat exchange device to effect pre-heating thereof; and pass water, as thus preheated, from the ambient air heat exchange device to the hot water heater as required. The ambient air heat exchange device may comprise a reservoir or a heat exchanger having at least one pipe.

Abstract: A portable instant water heater. Water is delivered to a base unit of the instant hot water heater by a pump that draws water from a reservoir through a flow control valve. The water flows into a pre-heater that wraps around a base of the burner and that is heated by the burner. Water is heated in a heat exchanger and then exits the base unit through an outlet spout that swings out from the base unit to dispense water and that may be stored and locked into position in a handle for the base unit. The flow control valve may lower the flow of water through the heat exchanger, so the water has more time to absorb heat and to get hotter. The base unit includes a single control knob that turns on the pump and the burner and operates the flow control valve.

Abstract: An explosion-proof hot water heater of the type having a gas-fired combustion chamber at a lower end of the inner tank is described. The combustion chamber is an unsealed chamber and has a sealed bottom wall and a fuel burner in the combustion chamber. Combustion air intake ports are provided about the combustion chamber above the sealed bottom wall. A support base supports the sealed bottom wall elevated from a support surface. Air intake openings are provided about the outer skin casing of the hot water tank and spaced a predetermined distance above the sealed bottom wall. Air passages communicate the air intake openings with the combustion air intake ports of the combustion chamber. A gas vapour sensor is secured in relation to the support base below the sealed bottom wall and is adapted to cause the burner to be shut off upon detection of explosive vapours with sufficient time delay before such vapours reach the combustion chamber.

Abstract: The invention relates to an equipment to be used in a gas-fired water heater which equipment contains a combustion chamber (2) and a heat exchanger (1). Accordingly the combustion chamber (2) is made of a ceramic material and provided with slots (3) for crossing the heating elements (4) of the heat exchanger (1) through the opposite walls (5,6) of the combustion chamber (2).

Abstract: A water heater apparatus includes a water conduit having an inlet and an outlet. A primary heat exchanger has a water side defining a portion of the water conduit. A burner is operatively associated with the primary heat exchanger for heating water in the water side of the primary heat exchanger. A variable flow blower provides pre-mixed combustion air and fuel gas to the burner at a controlled blower flow rate within a blower flow rate range. This apparatus allows the heat output of the water heater to be continuously varied within a substantial flow rate range having a turn down ratio of as much as four to one.

Abstract: An indirect fired process heater apparatus and method. The apparatus includes a toroidal shell having an outer cylinder and an inner cylinder forming a fluid tight enclosure. A plurality of helical heat transfer coils have transfer fluid passing therethrough wherein said heat transfer coils form an axial passageway. A burner directs heat into the axial passageway. The toroidal shell is in fluid communication with the heat transfer coils in order to circulate the heat transfer fluid therethrough. A plurality of helical process heating coils pass through the toroidal shell in order to heat process fluid passing through the process heating coils.

Abstract: A steam generator of water-tubes type for burn fossil fuel where instead of the convective heat transfer of the present day boilers, the water-tubes are heated by means of the mechanism of heat conduction in solids. The water-tubes are embedded in a large piece of a metal or alloy of high thermal conductivity, to which the thermal energy of the combustion gas is transferred from a long horizontal tunnel. Besides, in contradistinction with the present boilers, the water-tubes are straight and of high thermal conductivity.

Abstract: A fluid heater system with tiltable heater assembly for facilitating the performance of maintenance on the heater assembly. The fluid heater system with tiltable heater assembly includes a support frame and a heater assembly mounted on the support frame. The heater assembly comprises a combustion chamber and a burner apparatus for burning fuel in the combustion chamber. The heater assembly is pivotally mounted on the support frame for permitting pivoting of the heater assembly in a substantially vertical plane with respect to the support frame such that the heater assembly is pivotable between an operational position and a maintenance position. The operational position is characterized by a central axis of the combustion chamber being oriented in a substantially vertical direction and the maintenance position is characterized by the central axis being rotated from the substantially vertical direction toward a generally horizontal direction.

Abstract: In a water heater, an outer casing includes a hollow flue tube that extends vertically from an inner periphery of a bottom wall thereof, and an outer surrounding wall that extends uprightly from an outer periphery of the bottom wall and that cooperates with the flue tube to confine a receiving space. A heat-conducting unit is mounted inside the receiving space so as to configure the receiving space with isolated first and second chambers. The first chamber is filled with a thermal superconductor material. The second chamber is adapted for holding water therein. The heat-conducting unit includes a plurality of interconnected upright tubular members that cooperate with the outer casing to confine the first chamber therein. The second chamber is disposed externally of the tubular members. A heat-generating source is mounted below the outer casing for heating the water inside the second chamber.

Abstract: A spiral fluid heater coil system for facilitating drainage of fluid from the heater and increasing the efficiency of transferring heat to a fluid. The spiral fluid heater coil system includes a heater assembly including a combustion chamber having a chamber perimeter wall defining a chamber interior. The chamber perimeter wall has an upper end and a lower end, with the upper end of the chamber perimeter wall defining an opening into the chamber interior. The heater assembly includes a burner apparatus for burning fuel and expelling heat into the chamber interior of the combustion chamber, with the burner apparatus being positioned adjacent the lower end of the chamber perimeter wall for directing heat upwardly in the chamber interior toward the upper end of the chamber perimeter wall. The heating assembly includes a heating conduit for moving fluid through the heater housing to heat the fluid.

Abstract: A steam generator of water-tubes type for burn fossil fuel where instead of the convective heat transfer of the present day boilers, the water-tubes are heated by means of the mechanism of heat conduction in solids. The water-tubes are embedded in a large piece of a metal or alloy of high thermal conductivity, to which the thermal energy of the combustion gas is transferred from a long horizontal tunnel. Besides, in contradistinction with the present boilers, the water-tubes are straight and of high thermal conductivity.

Abstract: A hot water heater having a housing with a top chamber, a bottom chamber and a main tank. A cold water inlet pipe runs into the top chamber and extends into the tank. The cold water inlet pipe coils inward, beginning at circumference of the top chamber before extending into the tank, thus increasing the distance the water has to travel inside the heater. Contrastly, the hot water outlet pipe runs straight from the main tank through the top chamber and exits therefrom. The bottom chamber has a dome shaped ceiling with peaked apertures. A burner is positioned along the bottom surface and produces a flame that sends heated air upward, through the peaked apertures into connected heat distribution tubes which travel vertically through the tank. These tubes are angled along their length and have cylindrical fins attached. Once the heat from the flame rises through the apertures, it continues upward through the tubes, until it is released into the top chamber and exits trough an exhaust chimney.

Abstract: A water heater comprising a water-tight tank having a combustion chamber located in the bottom portion of the tank. A combustion air blower is operable to draw combustion air into the combustion chamber through a vertical tube in which the air flows from atmosphere downwardly into the combustion chamber. Combustion air entering the combustion chamber supports combustion of gas emanating from burners positioned in the combustion chamber. The products of combustion (flue gases) are drawn upwardly through a plurality of tubes, which extend from the combustion chamber to a flue gas collector box on the top of the water heater. From the flue gas collector box, the flue gases flow into an air/flue product mixing chamber and then out through an exit port.