In a water heater provided with an inlet pipe a downstream end of which is connected with an upstream end of a water heating channel of a heat exchanger for producing hot water, an outlet pipe an upstream end of which is connected with a downstream end of the water heating channel, and a bypass pipe branching at a part of the inlet pipe, which is positioned at an upstream-end part away from an upstream end, and is connected with a part of the outlet pipe, which is positioned at a more downstream part than at an upstream end, a connecting part of the bypass pipe with the outlet pipe and another connecting part of an inlet pipe and the upstream end of the water heating channel are arranged at a same height in a setting state of the water heater.

A gas heater for a swimming pool or spa includes a cabinet defining an interior, a combustion chamber enclosure, a heat exchanger positioned within the combustion chamber enclosure, a burner, a combustion blower configured to provide combustible gas to the burner, and electrical components positioned within the cabinet. The cabinet has a plurality of side panels and a top panel covering a top opening to the interior of the cabinet. The combustion chamber enclosure defines a combustion chamber, and is positioned within the interior of the cabinet. The combustion chamber enclosure also includes a burner opening in which the burner is positioned such that the burner is configured to dissipate combustible gas into the combustion chamber. At least one of the electrical components is configured to control the gas heater. The electrical components are accessible through the top opening when the top panel is removed.

A hot water supply apparatus has: a thermo-sensitive valve which is connected in parallel to a cold water delivery pipe and a hot water delivery pipe and which is closed when the hot water temperature to flow inside the valve is above a predetermined temperature to thereby shut off communication between the cold water delivery pipe and the hot water delivery pipe; and a circulation pump. By operation of the circulation pump, water circulation takes place from a heat exchanger through the hot water delivery pipe, a return pipe, the circulation pump, and a cold water supply pipe back to the heat exchanger. When the thermo-sensitive valve is open, water circulation takes place also through the thermo-sensitive valve. Instantaneous hot water supply operation is finished when an amount detected by a flow sensor falls below a predetermined amount during the instantaneous hot water supply operation.

In a heat source apparatus in which an electric component having an electrode and an insulator is mounted on a side plate of a combustion box, in a state in which a packing is interposed between a flange portion of the insulator and the side plate, by fastening a clamp which overlaps with an outer surface of the flange portion, to the side plate, the temperature rise in the clamp is restrained.

Upper and lower water tubes constituting a part of a water jacket are disposed on the side plate on upper and lower sides of the position of mounting the electrode component. In case the upper and lower water tubes are disposed on an inside surface of the side plate, the upper and lower parts of the clamp are brought into contact with those disposed positions of the water tubes which are in upper and lower portions of the side plate and, in case the upper and lower water tubes are disposed on an outside of the side plate, the upper and lower parts of the clamp are brought into contact with the upper and lower water tubes.

In a heat source apparatus in which an electric component having an electrode and an insulator is mounted on a side plate of a combustion box, in a state in which a packing is interposed between a flange portion of the insulator and the side plate, by fastening to the side plate a clamp which overlaps with an outer surface of the flange portion, the packing is prevented from getting spread when compressed, thereby securing good sealing properties.

Upper and lower water tubes constituting a part of a water jacket are disposed on a side plate on upper and lower sides of the mounting position of the electrode component. In case the upper and lower water tubes are disposed on an inside surface of the side plate, upper and lower side edge portions of the packing are in contact with those upper and lower swelled-out portions formed in the one-side side plate which are swollen outward for respectively receiving into recesses the upper and lower water tubes; and that, in case the upper and lower water tubes are disposed on an outside surface of the side plate, upper and lower side edge portions of the packing are in contact with the upper and lower water tubes.

A fluid heater for a heating fluid and having a fluid inlet and a fluid outlet may comprise a heater housing defining an interior with a combustion chamber being positioned in the interior of the housing, and fluid tubing in the interior of the housing and adjacent to the combustion chamber, with the fluid tubing defining a fluid path through the housing between the fluid inlet and the fluid outlet. The heater may also include a burner configured to combust a fuel in the combustion chamber to heat the fluid tubing. At least a portion of the fluid path may comprise a bifurcated fluid path between the fluid inlet and the fluid outlet.

A fin includes a cut and raised slit and a cut and raised wall portion. The cut and raised slit is formed in a region adjacent to at least one through hole of a plurality of through holes in a first direction and has a tunnel-shaped hole extending in a second direction intersecting the first direction. The cut and raised wall portion is located in the second direction of the cut and raised slit, protrudes toward a main surface of the fin, and extends along the first direction. Thus, a heat exchanger and a water heater capable of sufficiently conducting an amount of heat of a combustion gas to a heat conduction pipe even in a blind spot of a flow of the combustion gas of the heat conduction pipe and suppressing noise can be realized.

A combustion apparatus includes a burner (11), a heat exchanger (12) accommodated in a casing (20), an exhaust passage (22B) provided to one side surface side of the casing (20), and an exhaust resistance member (5) having a plurality of ventilation ports (50) through which combustion exhaust gas passes, wherein at least one part of the ventilation ports (50) has an elongated hole shape extending in the flow direction of the combustion exhaust gas from beneath the casing (20) to the exhaust passage (22B).

An apparatus, method, and device for heating water using in-line magnetic induction. The heating system utilizes eddy currents created via one or more magnetic fields acting upon a stationary ferrous core. The device can be housed within an enclosure, which can in turn be connected to any existing water line, and can be connected to basic house voltage. During operation, cold water enters the enclosure, passes through the system, and leaves the system at a desired temperature setpoint greater than the initial inlet water temperature.

A water heater includes a primary heat exchanger, a secondary heat exchanger disposed above the primary heat exchanger, a flow path member, and a flow restriction member. The secondary heat exchanger includes a case and heat transfer pipes arranged in the case. The case includes a wall having a gas inlet through which combustion exhaust gas discharged from the primary heat exchanger is introduced into the case. The flow path member connects the primary heat exchanger and the secondary heat exchanger and is disposed adjacent to the gas inlet and is configured to introduce the combustion exhaust gas discharged from the primary heat exchanger into the secondary heat exchanger through the gas inlet. The flow restriction member is disposed on the wall of the case to suppress upward flowing of the combustion exhaust gas that is introduced into the case through the gas inlet.