The present invention may be embodied as a biofuel heating system comprising a controller for operating a fan based on a load operating parameter such that air flows along a flow path extending through a combustion chamber, through a burn-out port, through a burn-out chamber, through a heat exchange port, through a heat exchange chamber, and out of an exhaust port. A heat exchange system transfers heat energy from air flowing through the heat exchange chamber to a working fluid. The controller operates in a char mode based at least in part on the load operating parameter, and the biofuel remains within the combustion zone during the char mode.

The present utility model provides a gas exhausting device and a gas water heater, relating to the technical field of gas exhausting equipment. The gas exhausting device comprises an exhaust structure and a buffer structure, and gas in an exhaust channel is dischargeable from an exhaust port; the exhaust structure is further provided with a communication port located upstream of the exhaust port in a discharging flow direction of the gas; the buffer structure is used for forming a buffer cavity in communication with the exhaust channel through the communication port. In the present utility model, the buffer cavity of the buffer structure can weaken the vibration frequency and intensity of the waste gas to prevent transmission of the vibration of the waste gas to the exhaust structure to cause the problem of screech resonance, thereby improving the user's use experience. In addition, by the vibration damping effect of the buffer structure, the range of the ignition and flame spreading interval is enlarged, so that the problem of screech resonance would not occur in the exhaust structure even if the fan is at a larger or smaller speed, which reduces the difficulty of debugging the gas water heater and improves the reliability of the gas water heater.

3-way fluid valve (30), having a housing (31) providing a first connection port (32), a second connection port (33) and a third connection port (34), a valve plunger (35) positioned within the housing (31), an actuator (36) for actuating the valve plunger (35) and for transferring the valve plunger (35) and thereby the 3-way fluid valve (30) between different states, wherein in a first state of the valve plunger (35) and 3-way fluid valve (30) a fluid flow through the first connection port (32) and through the second connection port (33) and through the third connection port (34) are all blocked, wherein in a second state of the valve plunger (35) and 3-way fluid valve (30) only a fluid flow through the first connection port (32) is blocked allowing a fluid flow from the second connection port (33) to the third connection port (34), wherein in a third state of the valve plunger (35) and 3-way fluid valve (30) only a fluid flow through third connection port (34) is blocked allowing a fluid flow from the first connection port (32) to the second connection port (33).

A quick-change thermocouple system for hot water heaters is disclosed, comprising multiple thermocouples pre-installed on a pull bar within the flame chamber. The system allows for easy replacement of faulty thermocouples without specialized tools or technical knowledge. When a thermocouple fails, the user pulls an external handle, sliding the pull bar to position a new thermocouple over the pilot flame. This action removes the faulty thermocouple and simultaneously installs a fresh one. The system significantly reduces hot water service downtime, eliminates the need for professional intervention, and improves safety by ensuring correct thermocouple replacement. It can be implemented with minimal changes to existing hot water heater designs and allows for multiple replacements without opening the unit. This invention extends the operational lifespan of hot water heaters, reduces costs for homeowners, and promotes self-reliance in home appliance maintenance.

A thermal insulation material is arranged on an inner surface of a swelling part formed at a side plate part and outwardly swelling in an X-axis direction so as to be sandwiched from both sides in a Z-axis direction by a step outwardly bent in the X-axis direction and positioned an end, in a Z-axis plus direction, of the swelling part and by a structural member of a burner protruding inwardly in the X-axis direction from an end, in the Z-axis minus direction, of the side plate part. A vicinity portion of an end, in the Z-axis plus direction, of the thermal insulation material is held from an inside in the X-axis direction by a side edge portion, on each side in the X-axis direction, of the fins.

A packaging system for a hot water heater includes an outer box, a top insert, an offset filler, a base insert, and one or more side panels. The top insert contacts a top surface of the hot water heater and a top inside surface of outer box. The offset filler is coupled to the top insert and is sandwiched between the hot water heater and the outer box. The base insert contacts the bottom surface of the hot water heater and a bottom inside surface of the outer box. The base insert includes raised perimeter structures that form a shape that matches a shape of the bottom surface of the hot water heater. Each side panel includes a raised pattern.

A water heating system includes an enclosure having a thermally-insulated top and a plurality of thermally-insulated walls, the enclosure being at least substantially open at a bottom of the enclosure and adapted for mounting above an opening in a roof of a building. The water heating system also includes a water heater mounted within an interior of the enclosure.

A portable water heater includes an inner bracket and a thermostatic chamber. A burner and a heat exchanger are arranged in the inner bracket. An upper end of the heat exchanger is provided with a fume collecting hood. The burner includes multiple fire rows arranged side by side, and the fire rows are connected to each other through a gas-distributing rod. The gas-distributing rod is provided with a segmented self-priming valve. A gas-regulating valve is provided on a gas inlet pipe. An inlet end of an internal heat-exchanging pipe of the heat exchanger is communicated with a cold water feeding pipe. The thermostatic chamber has a water inlet connected to a hot water delivering pipe and a water outlet connected to a hot water discharging pipe, and a connecting pipe is provided between the cold water feeding pipe and the hot water delivering pipe.

A water heating system includes a burner and a gas valve fluidly connected to the burner to deliver a flow of combustible gas thereto. The gas valve has an adjustable throttle for the flow of combustible gas, along with a motor to adjust a position of the throttle. A controller is configured to determine a throttle position corresponding to a target air-fuel ratio of the burner during a calibration sequence, and to control the motor in order to operate the burner at that target air-fuel ratio throttle position during a start sequence. The controller is configured to monitor a characteristic of the burner during the start sequence, and to initiate the calibration sequence if the monitored characteristic exceeds an error threshold.

A feeding assembly for feeding at least one fuel gas to a burner of a boiler has a feeding duct configured to feed to the burner a feeding flow of fuel gas in a feeding direction; and a safety device, which is arranged in the feeding duct and is shaped so as to define a stagnation zone configured to contain a return flow of gas from the burner in the feeding duct in a return direction substantially opposite to the feeding direction.