Abstract: A water heater includes a case, and a water line disposed within the case. The water line extends between an inlet and an outlet, and a heat exchanger is disposed in the case on the water line. A burner is disposed in the case, and a controller is also disposed in the case. A flue is coupled to the case. The flue defines an exhaust outlet contiguous with external air. The flue includes a temperature sensor, a fan, and a plate disposed within the flue. The plate is configured to rotate within the flue between an open position and a closed position. Also included in the case is a heating element coupled to the water line between the inlet and the outlet of the water line. The controller is in signal communication with the temperature sensor and the fan, and the controller is in operative communication with the heating element.

Abstract: Provided is a tank including a polymeric upper dome having a neck with a through passage, a polymeric lower dome having a neck with a through passage, a polymeric shell having a first end connected to the upper dome and a second end connected to the lower dome, and a connection attached to each of the upper and lower domes in the through passages of the necks, wherein the upper dome, lower dome, and shell form a cavity.

Abstract: A lid for a heat generating device in which the heat generating device has a body with a combustion chamber disposed therein. The lid includes an air moving device, an air intake housing, and a hinge. The air moving device is configured to generate a flow of air. The air intake housing is disposed between the lid and the air moving device. The air intake housing extends out from the lid to cantilever the air moving device out from the lid. The hinge is disposed between the lid and the body and proximal to the air intake housing. The hinge is configured to provide a pivot for the lid. A weight of the air moving device counter balances at least a portion of a weight of the lid to ease pivoting of the lid into an open position.

Abstract: A centrifugal fan is provided and includes an impeller, a motor, a first case and a second case. The motor is connected with the impeller to drive the impeller to rotate. The first case and the second case are assembled to form an accommodation space for accommodating the impeller and the motor. The first case includes a first side, a first guiding wall, a flow inlet and a flow outlet. The flow inlet is disposed on the first side, the first guiding wall is connected with the first side, and the flow outlet and the flow inlet are located at a same side of the centrifugal fan. The second case includes a second side and a second guiding wall connected with the second side. The first guiding wall and the second guiding wall are assembled to form a flow guiding channel, which has cross-sectional areas with different sizes.

Abstract: An apparatus includes first and second electrically conductive tubes, first and second electrical isolators, and a nut. The first electrical isolator has a central passageway. The first electrically conductive tube has a flared end disposed around the first electrical isolator. The flared end includes external threads. The second electrically conductive tube has an outer flange. The second electrical isolator is disposed around the second electrically conductive tube and engages the outer flange. The nut is disposed around the second electrically conductive tube and engages the second electrical isolator. The nut includes internal threads corresponding to the external threads of the flared end of the first electrically conductive tube.

Abstract: A barrier device to prevent insects from entering an opening of a vent in fluid connection with an interior of a building includes a body which includes a housing. The housing includes a first end adapted to be placed in fluid connection with the vent opening and a second end. The barrier device further includes a mesh barrier positioned adjacent the second end, opposite the first end, through which fluid (gas and liquid) can pass. However, insects of a predetermined range of size cannot pass through the mesh barrier. The mesh barrier has an effective open area at least as large as an open area of the opening of the vent.

Abstract: A water boiler comprises an inner tank, an electric heating pipe, and a controller. A lower cover is attached to a mouth of the inner tank. The lower cover comprises an inlet pipe and an outlet pipe, wherein an outlet port at a lower part of the inlet pipe is in communication with lower part within the inner tank. An inlet port of a lower part of the outlet pipe is in communication with an upper part of the inner tank. The lower cover is arranged beneath the upper cover. An upper part of the inlet pipe passes through the upper cover. A cavity is formed between the lower cover and the upper cover. The cavity is partitioned into an upper chamber and a lower chamber by a diaphragm. The lower chamber is in communication with an outer space.

Abstract: The present disclosure discloses a gas water heating apparatus comprising: a shell; a burner, a heat exchanger, and a fan which are disposed in sequence within the shell, wherein a combustion region is formed between the burner and the heat exchanger that are spaced from each other by a first preset distance; a first enclosing frame that encloses the combustion region, an air inlet portion being disposed on a side wall of the first enclosing frame; a heat insulating plate which is disposed within the first enclosing frame and is spaced from an inner surface of the side wall of the first enclosing frame by a second preset distance, wherein when the fan is in operation, air outside the first enclosing frame can flow into a region between the first enclosing frame and the heat insulating plate through the air inlet portion. The present disclosure provides a gas water heating apparatus having an optimized temperature reducing structure and capable of achieving a significant temperature reduction effect.

Abstract: A plug system for sealing a tube having two axially positioned plugs, each of which includes a tubular housing having a deformable wall that surrounds a threaded inner bore and an insert member having a threaded post corresponding to the inner bore, a ramped surface positioned to deform the deformable wall outwardly when the threaded post is advanced into the first inner bore, and a first driving recess having a that is positioned oppositely from the first threaded post. The first plug may be installed in place using a driving recess in the rear of the plug to form a first seal in the tube. The second plug may then be interlocked with the driving recess of the first plug and installed in place to form a second seal in the tube.

Abstract: A water heater has a tank, a burner, and a heat exchanger within the tank interior volume that has three tubes. The burner exhausts gas into the first tube. The second tube is non-linear, and the third tube connects the first tube with the second tube. The cross-sectional area of the first tube is greater than the cross-sectional area of the third tube. The cross-sectional area of the third tube is greater than the cross-sectional area of the second tube.

Abstract: A water heater includes a leak detection system. The leak detection system includes a leak sensor assembly that is disposed in a bottom pan of the water heater. The leak sensor assembly includes a sensor housing that has a sensor channel that is formed therein such that the sensor channel is disposed at an elevation from a base of the bottom pan when the sensor housing is disposed on the base of the bottom pan. Further, the leak sensor assembly includes a leak sensor that is disposed in the sensor channel of the sensor housing. The leak sensor detects water that leaks from the water heater and accumulates in the bottom pan when a level of the water in the bottom pan rises to the elevation of the sensor channel and the leak sensor that is disposed therein.

Abstract: Systems and methods in accordance with embodiments of the invention implement air conditioning systems that are operable to establish/maintain a desired temperature for a target space and simultaneously establish/maintain a temperature lower than the desired temperature for the target space for an included cold thermal energy storage unit. In one embodiment, an air conditioning system includes: a condensing unit; a liquid pressurizer and distributor ensemble; a cold thermal energy storage unit; a target space; and a suction gas/equalizer; where the listed components are operatively connected by piping such that vapor compression cycles can be simultaneously implemented that result in the cooling of the cold thermal energy storage unit and the target space; and the air conditioning system is configured such that the simultaneous implementation of vapor compression cycles results in cooling the cold thermal energy storage unit to a greater extent relative to the target space.

Abstract: Model predictive control methods are disclosed which provide, among other things, efficient strategies for controlling heat-transfer to a fluid.

Abstract: A diffusion pump is provided that includes a housing and a boiling chamber connected to the housing. The boiling chamber has a heating element. The housing has a nozzle that is connected to the boiling chamber. The housing also has a condenser is arranged at an internal surface, where the condenser has a cooling system. The boiling chamber is thermally isolated from the condenser by an isolator. The cooling system is at least partially a water cooling system and is connected to the heating element via a heat pump such that heat from the condenser is supplied to the heating element.

Abstract: A vibrating-tube fluid measurement device includes a tube, a base block, a magnet which applies a magnetic field to the tube, an excitation source which generates vibration of the tube, a vibration sensor which measures a signal corresponding to a vibration frequency of the tube, and an electrical isolator formed of glass, wherein the vibrating tube is mounted to a base block via the electrical isolator and electrically isolated from the base block via the electrical isolator.

Abstract: A combined space conditioning or heating and fluid heating system includes a main fluid conductor having an inlet and an outlet; a single heating source configured for producing low and high temperature fluid outputs of a fluid input received at the main fluid conductor inlet; a coil comprising an inlet and an outlet; and a supplementary fluid conductor comprising a fluid mover and a directional valve, an inlet and an outlet. The inlet of the main fluid conductor is adapted for connection with the coil outlet. The high temperature fluid output is adapted for connection with the supplementary fluid conductor inlet, the supplementary fluid conductor outlet is adapted for connection with the coil inlet. The low temperature water output is adapted for connection with a fluid delivery point. The water coil inlet is adapted for connection with a raw fluid supply.

Abstract: A pipe arrangement for a turbomachine is provided having a fluid pipe for guiding fluids and a coupling element for coupling the fluid pipe to a temperature affected component. The coupling element is configured to provide a first connection between the coupling element and the component by a first end of the coupling element. The coupling element provides also a second connection between the coupling element and a first surface section of the fluid pipe by a second end of the coupling element. Furthermore, the coupling element has a sleeve portion surrounding a second surface section of the fluid pipe and being spaced apart to the second surface section of the fluid pipe. A fluid inlet or outlet arrangement is also provided having such a pipe arrangement and also a gas turbine engine having such a pipe arrangement.

Abstract: The shower head attachment is installed in a shower head feed line The shower head attachment comprises a perforated tube, an expandable bladder, and a release valve. The release valve is installed between the perforated tube and the shower head. The perforated tube is contained within the expandable bladder. Water that flows through perforations of the perforated tube is stored within the expandable bladder. When the release valve is closed and the shower valve is opened, the pressure of the hot water line of the residential plumbing system forces cooled stored within the hot water line into the expandable bladder. The release valve is opened enabling the continued flow hot water into the perforated tube where the hot water mixes with the cooled water creating a more temperate water temperature that is released through the shower head.

Abstract: A fluid conduit dielectric nipple for securement to a tank wall of a fluid holding tank, such as a steel tank of a water heater is described. The fluid conduit dielectric nipple has a tank securement end and a cylindrical conduit connecting end specifically configured for receiving a push-fit quick connector to secure to a water supply line and a hot water return line. The fluid conduit dielectric nipple is fabricated from inexpensive metal, such as plated steel, and has a plastics liner to protect parts thereof intended to be exposed to water to prevent corrosion while providing a leak-proof connection. Accordingly, there is provided an inexpensive dielectric nipple which provides quick connection and disconnection.

Abstract: The invention relates to a water heater comprising a water tank, and a number of passageways for connection of valves and water tubes, in which an integrated channel or void is at least extending below the water tank and leads into an outlet to a drain. In one aspect, the invention also relates to a combination for a water heater comprising a top cover and a bottom tray, and in another aspect to a bottom cover for a wall mounted water heater.

Abstract: The efficiencies of illustrative embodiments of vertical center flue type fuel-fired base water heaters are improved by installing in the water heaters variously configured tubular condensing type secondary heat exchangers of smaller diameters than the associated center flues. The efficiency increases are achieved with components and manufacturing processes similar to those utilized in the base water heaters and secondary heat exchanger materials similar to those in the tank portions of the base water heaters.

Abstract: An improved method of making a baked pastry, particularly, a shell or wrap for a samosa from a pastry dough in a convection baking oven having a convection atmosphere, the method comprising baking the dough in the oven at a baking temperature for a baking period of time, the improvement having the convection atmosphere with a sufficiently moist atmosphere for the duration of the baking time to prevent the pastry from becoming dry.

Abstract: In a cogeneration system that stores hot water heated by exhaust heat of a generator in a hot water storage tank, a situation in which there is a risk of freezing of water in a water circulating passage is accurately grasped, and thus anti-freezing control prevents the freezing from occurring and unnecessary anti-freezing control is reduced to suppress the drop in efficiency of the system. When determined that an environmental temperature Ta is lower than a lower-limit value Ta_min, it is determined whether or not a temperature difference ?T (=Tr1?Tr2) between a radiator inlet temperature Tr1 and a radiator outlet temperature Tr2 exceeds a predetermined value ?T0, and when determined that the temperature difference exceeds the predetermined value ?T0, it is determined that there is a risk of freezing of the water in the water circulating passage and an command to execute the anti-freezing control is output.

Abstract: An appliance includes a water heater storage tank, a heating assembly configured to heat water within the water heater storage tank, and a heat exchange device disposed within the heat storage unit in a fixed relationship relative to a position of the heating assembly. The heat exchange device includes a hollow object and a phase change material within the hollow object.

Abstract: A water heater having a water tank and a heating source disposed proximate to the water tank such that the heating source may heat water within the water tank. A temperature sensor is provided that is partially thermally isolated from the water in the water tank. A controller may be provided that at least partially compensates for the partial thermal isolation of the temperature sensor and regulates the heating source. In some instances, the temperature sensor may be at least partially disposed within a thermally isolating mass.

Abstract: A water heating apparatus includes a fluid inlet conduit configured to split into a plurality of supply legs, and a plurality of heat exchangers configured for parallel operation. Each heat exchanger includes an outer housing, an inlet connected to a respective supply leg of the fluid inlet conduit for receiving an inlet flow of liquid into the outer housing, an outlet for allowing an outlet flow of liquid to leave the outer housing, and a heat exchange element positioned within the outer housing and configured to heat a flow of liquid passing through the outer housing from the inlet to the outlet. The water heating apparatus further includes a burner assembly comprising a combustion chamber housing and a burner positioned internally within the combustion chamber housing. The burner assembly is coupled to the plurality of heat exchangers for supplying heat to the flow of liquid.

Abstract: A seal comprising a high temperature silicone adhesive sealant layer; a first non-ceramic layer mounted to the silicone adhesive sealant layer; a first expanded metal layer mounted to the first non-ceramic layer; a first silicone cloth layer mounted to the first expanded metal layer; a metal reinforcement layer mounted to the first silicone cloth layer to provide structural integrity without the use of ceramic materials; a second expanded metal layer mounted to the metal reinforcement layer; a second non-ceramic layer mounted to the second expanded metal layer; a turbine mesh layer mounted to the second non-ceramic layer; a second silicone cloth layer mounted to the turbine mesh layer; a sealing castable applied over the second silicone cloth layer to provide a covering; and, a high temperature bonding adhesive disposed between each layer following the first non-ceramic layer to bind the layers together.

Abstract: A water heater comprises a tank, a cylinder coil section and a return-flow coil section. The cylinder coil section is in a heat transfer relationship with the tank and encircles a first portion of the tank. The return-flow coil section is in a heat transfer relationship with the tank and encircles a second portion of the tank. The cylinder coil section and the return-flow coil section are continuous over at least the first and second portions of the tank.

Abstract: A water heater door assembly includes a base plate sized and shaped to substantially sealingly cover an access opening in a water heater combustion chamber and has at least one opening through which a fuel supply line extends at least partly between a burner in the combustion chamber and a gas control valve, and a flexible seal positioned at least partly within the opening including an engaging portion substantially sealed to an edge portion of the opening, and a through hole that is shaped to receive the fuel supply and has a size slightly smaller than the size of an outer dimension of the fuel supply line such that the flexible seal and the fuel supply line are friction fit together to form a seal.

Abstract: Apparatus and methods are provided for thermal energy metering by measuring the average temperature of fluid in a tank, such as a hot water storage tank. Average temperature is measured with an elongated temperature sensor spanning the vertical height of the tank. A controller collects measurements from the temperature sensor and computes changes in thermal energy, from which the system can more accurately attribute gains of thermal energy to sources such as thermal, electric, or gas production, or losses of thermal energy to ambient losses and consumption.

Abstract: A method for examining water heater safety includes the steps of: setting a desired temperature and sensing a cold water temperature and a flow rate of water to calculate a theoretical gas consumption, and then supplying a combustor the theoretical gas consumption to heat water; sensing a hot water temperature, and calculating a temperature ratio by the desired temperature, the cold water temperature and the hot water temperature. Examining the temperature ratio may find that the water heater is abnormal or malfunctioning. An efficiency ratio may also be calculated by the theoretical gas consumption and the actual gas consumption. Examining the efficiency ratio may find that the water heater is abnormal or malfunctioning as well.

Abstract: A solar energy water heater system composed of a method of retrofitting an existing conventional gas or electric water heater. In particular, this invention relates to adding a solar energy water heater system comprised of: a solar collector, a solar thermal circulating loop, an over-heat protection loop, and a computer controller with temperature sensors. The solar thermal circulating loop and over-heat protection loop are installed on the existing water storage tank, and the method and system is disclosed herein.

Abstract: A seal comprising a high temperature RTV silicone adhesive sealant layer; a first non-ceramic layer mounted to the RTV silicone adhesive sealant layer; a first expanded metal layer mounted to the first non-ceramic layer; a first silicone cloth layer mounted to the first expanded metal layer; a metal reinforcement layer mounted to the first silicone cloth layer to provide structural integrity without the use of ceramic materials; a second expanded metal layer mounted to the metal reinforcement layer; a second non-ceramic layer mounted to the second expanded metal layer; a turbine mesh layer mounted to the second non-ceramic layer; a second silicone cloth layer mounted to the turbine mesh layer; a sealing castable applied over the second silicone cloth layer to provide a covering; and, a high temperature bonding adhesive disposed between each layer following the first non-ceramic layer to bind the layers together.

Abstract: A water heater especially for bathroom includes a hair filter (1), a water self pumping pump (2), a heat exchanger (3), a water valve (5), a controller (6), an operator (7), three water flow resistance amplifiers (8) and a waste water tank (9). The heat exchanger can recover the heat from the waste water during bathing and preheat cold water. The waste water tank can reuse the waste bath water for flushing toilets. Said parts are assembled by pipes and electric circuits and arranged on the proper position in the bathroom.

Abstract: An alarm system for a storage hot water heater comprising an alarm housing, power supply leads inserted through the top of a hot water heater tank, a fluid collection pan positioned under the tank, and a fluid detection sensor associated with the pan. The alarm housing is configured to provide prompt owner/operator notification after only a small amount of fluid is collected in the pan under the tank. Owner/operator notification can be provided via audible, visual, and/or remote means, such as but not limited to a signal transmitted to a home security device that is relayed to a 24-hour security monitoring network. Since the alarm housing is hard wired, reliance on batteries is avoided and the system's useful life meets or exceeds that of the associated hot water heater. In addition, the leads never have to be removed from the hot water heater tank and can be made tamper-resistant.

Abstract: A combined compact hot and ozonated cold water unit which comprises a framework that accommodates a hot water heater device, a ozone generator device and a combined temporary storage tank having both a hot water compartment and a separate cold water compartment. The hot water heater device is connected with the hot water compartment of the combined temporary storage tank for heating the water contained therein. The ozone generator device is connected with only the water compartment of the combined temporary storage tank for supplying ozone to the water contained therein.

Abstract: Water tanks, such as water heaters, are coated with an organic polymer coating, which coating contacts water during use of the water tank. The organic polymer coatings resist corrosion or blistering when used to store or contain water. The water tanks may be made by treating a metal surface prior to application of the organic polymer coating.

Abstract: A boiler has a plurality of inner heat-transfer tubes which makes up an inner heat-transfer tube row, and a plurality of outer heat-transfer tubes which makes up an outer heat-transfer tube row. Inner fins project from each of the inner heat-transfer tubes on an outer circumferential side of the inner heat-transfer tube row. Outer fins project from each of the outer heat-transfer tubes on an inner circumferential side of the outer heat-transfer tube row. An inner row communicating portion is provided in a lower end portion of the inner heat-transfer tube row. An outer row communicating portion is provided in an upper end portion of the outer heat-transfer tube row. An inner-fin absent region is provided in a lower end portion of each of the inner heat-transfer tubes. An outer-fin absent region is provided in a longitudinally middle portion of each of the outer heat-transfer tubes.

Abstract: A pipe connecting structure of a water heater. Individual parts in the water heater are integrally coupled with a pipe body, which is injection-molded, provides paths of tap water and hot water, reduces the number of pipes connecting the individual parts, and simplifies the connection structure of the pipes. The pipe connecting structure of the water heater includes a tap water inlet pipe connected from a tap water inlet to a heat exchanger; a hot water supply pipe connected from the heat exchanger to a hot water outlet; a flow sensor for measuring the flow rate of the tap water introduced via the tap water inlet; and a flow control valve for controlling the flow rate of the hot water discharged via the hot water outlet. The pipe body connects and is integral with the tap water inlet, the tap water inlet pipe, the hot water supply pipe, and the hot water outlet.

Abstract: A method, including: receiving an instruction from a user of a hot water tank (24) indicating a target temperature and a duration of a supply of water. In response to receiving the instruction, water at multiple different temperatures within the hot water tank is mixed so as to form mixed water in the tank. The method includes measuring an actual temperature of the mixed water in order to make a determination of whether the mixed water will satisfy the instruction. The method also includes activating a heater (120) to heat the mixed water responsively to the determination.

Abstract: A method and apparatus for conveying condensate from an exhaust system of a gas water heater to a drain. The method includes the steps of operating the gas water heater to produce products of combustion, operating a blower to cause the products of combustion to flow through the exhaust system to atmosphere, allowing condensate from the products of combustion to form within the exhaust system, using a drain conduit to connect a relatively high pressure zone of the exhaust system to a relatively low pressure zone of the exhaust system, using a pressure differential between the relatively high pressure zone and the relatively low pressure zone to convey condensate through the drain conduit from the relatively high pressure zone to the relatively low pressure zone, and conveying condensate from the relatively low pressure zone to the drain.

Abstract: An energy savings water heater is described. The water heater is controlled by an energy savings algorithm that uses one or more of a variable setpoint differential, a variable setback threshold, additional setback thresholds, and an adjustable minimal setpoint to improve the operation of an energy efficient water heater. Additionally or alternatively, a different setback control algorithm may be used that obtains additional data to adjust the setpoint. As a result, the operating cost of the water heater is reduced, while minimizing user complaints of cold water.

Abstract: Hot water pipes, in areas with hard water, tend to fill with scale until they no longer pass enough water. De-scaling water pipes with acid is dangerous, expensive and damages the pipes. Ion exchange and reverse osmosis water softeners eliminate scale buildup in pipes, but are expensive. Embodiments of this invention provide a means of keeping an amount of the scale precipitate, created when water is heated, inside a housing by passing the hot water through a removal medium where the scale sticks to the surface. The removal medium can be placed inside the water heater or in a separate housing connected to the water heater; both configurations remove the precipitate from hot water; both save hot water pipes from scale accumulation.

Abstract: A water purifier includes: a purified water tank storing purified water; a hot water tank connected to the purified water tank to receive the purified water from the purified water tank and including a heater heating the received purified water; a manipulation unit through which an extraction amount of hot water is inputted; and a control unit performing a control to supply the purified water of the purified water tank to the hot water tank by the extraction amount of hot water, when the extraction amount of hot water is inputted to the manipulation unit, and operating the heater to heat the water of the hot water tank. According to the present invention, the power consumption of the water purifier decreases in comparison with a conventional water purifier. Furthermore, it is possible to provide an accurate amount of hot water to a user without using a water level sensor.

Abstract: A hydrocarbon-fueled hot water heater for supplying hot water includes a cold water inlet, a hot water outlet, a selectively activatable burner for applying heat to a volume of water between the inlet and the outlet, a sensor for sensing activation of the at least one burner, and a communication interface for communicating data corresponding to the activation of the at least one burner to a processor configured to multiply the amount of time the burner is activated by a known value corresponding to a flow rate of the burner to estimate an amount of fuel consumed by the hydrocarbon-fueled hot water heater. Other devices and methods of submetering hydrocarbon fueled water heaters are also included.

Abstract: A motor/damper assembly installable on the top end of a fuel-fired water heater includes a support plate structure upon which a flue collar with a pivotally supported flue damper, a drive motor, and a drive shaft interconnecting the motor damper are mounted. The assembly is installed by placing the collar over the upper end of the water heater flue, securing the support plate structure to the top end of the water heater, and positioning a top cover housing on the support plate structure. Using the assembly provides improved support rigidity and alignment for the motor and shaft relative to the damper, improved repeatable precise manufacturing placement of the motor and shaft, improved construction aesthetics, with the cover also protecting the shaft from shipping and handling damages.

Abstract: A water heater capable of suppressing an increase in the combustion air temperature exiting the heater and the generation of nitrogen oxide within an easy structure is provided. In the water heater, a burner is provided in a combustion chamber which is below a hot water storage chamber that is an all primary air burner which takes in the air required for gas combustion, whereby the air is mostly primary air. In addition, the burner is provided with a supporting plate in the combustion chamber at a height that allows part of the burner head to be protruded into a space covered by a lower mirror plate.

Abstract: A water heater for heating potable water used in a boat or vehicle. Exhaust heated by the burner of the water heater is discharged from the burner and is conveyed through an exhaust duct which extends through a water jacket surrounding the burner and which water jacket holds the potable water to be heated. The potable water is heated by the burner and also by the hot exhaust gases in the exhaust duct. Operating components are accessible from one end of the water heater.

Abstract: A water heater including a water inlet line having an inlet opening that introduces cold water to a tank, a water outlet line having an outlet opening that withdraws heated water from the tank, and a heating element. The water heater further includes a control circuit. The heating element can be an electrical resistance heating element, a gas heating element, or a combination thereof. In one construction, the gas heating element includes a first combustive section and a second combustive section separately controlled from the first combustive section.

Abstract: The object is to provide a water heater capable of efficiently transmitting radiation heat of a burner to hot water in a hot water storage chamber with improved thermal efficiency. In the water heater, a second restriction part having a shallower depth than a first restriction part is arranged along a peripheral edge of a lower mirror plate of a hot water storage chamber with a protrusion part protruding in a ring shape toward the center side of the lower mirror plate. The protrusion part is further arranged between the first restriction part and the second restriction part, and a burner is positioned so that the burner combustion surface faces the protrusion part.