A combustion device includes: a gas proportional valve; a control portion; a driving circuit; and a monitoring circuit. The monitoring circuit includes: a voltage generating portion configured to generate monitoring voltages corresponding to a driving current; and a branch output portion configured to output the monitoring voltages to a plurality of terminals of the control portion. When a voltage difference between the monitoring voltages input to the plurality of terminals is a determination reference value or more, the control portion determines that there is a failure of the monitoring circuit. When the voltage difference between the monitoring voltages is less than the determination reference value, and at least one of the monitoring voltages does not fall within a predetermined normal range while the gas proportional valve is controlled to become a predetermined state, the control portion determines that there is the failure of the monitoring circuit.

An on-demand high volume capable fluid heating system for supplying a total heating power at a turndown ratio and a total flowrate of a fluid supply, the fluid heating system comprising a plurality of heat exchangers fluidly connected in parallel, each of the plurality of heat exchangers comprising: a fluid conductor, wherein each of the plurality of heat exchangers contributes to the total heating power and a portion of the total flowrate of the fluid supply through the fluid conductor; an inlet conductor configured to connect the fluid supply to the plurality of heat exchangers; an outlet conductor configured for receiving the fluid supply downstream of the plurality of heat exchangers; an auxiliary conductor connecting the inlet conductor at a first location and the outlet conductor, the auxiliary conductor comprising a modulating valve; and a pump disposed downstream from the first location on the inlet conductor.

A plate heat exchanger includes a plurality of plates stacked so that a liquid flow passage is formed on the inside thereof, and a gas flow passage through which heating gas passes, the gas flow passage being formed between the plurality of plates and including a gas inflow opening portion and a gas outflow opening portion positioned on an opposite side to the gas inflow opening portion, wherein the gas outflow opening portion has a smaller opening area than the gas inflow opening portion. Thus, when the heating gas passes through the gas flow passage, even if the volumetric flow thereof decreases due to a reduction in temperature or condensation, a reduction in the flow velocity of the heating gas can be suppressed. Hence, a reduction in a heat transfer coefficient can be suppressed, leading to an improvement in heat transfer efficiency, and as a result, reductions in overall size, weight, and manufacturing cost can be achieved appropriately.

A water heater has a water supply line, a heat exchanger in fluid communication with the water supply line, a heating element positioned proximate to the heat exchanger, such that when activated, the heating element conveys heat to the heat exchanger and thereby heating water supplied by the water supply line, an output line in fluid communication with the heat exchanger and configured to receive heated water therefrom, a flow sensor configured to cause the heating element to activate in response to sensing a predetermined water flow rate through the water heater, and a bypass flow line operably connected between the water supply line and the output line.

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.

Provided are a housing assembly and a water heater. The housing assembly includes a bottom plate assembly and an outer housing. The outer housing is provided with a hooking fitting portion, the bottom plate assembly includes: a base and a supporting portion, a crimping space for positioning the outer housing is formed between at least portion of the supporting portion and the base. The hooking fitting portion is hooked with the crimping space.

An offset mounting bracket that comprises a primary member and a stabilization member can be used to mount multiple heat engines to a water storage tank. An offset mounting bracket can include a primary member, having a top surface, a bottom surface, an inner surface, and an outer surface. The offset mounting bracket can also have a stabilization member, having a top surface and a bottom surface, a supporting surface that is opposed and connected to the primary member outer surface. The offset mounting bracket can also have a connecting member. The connecting member can be configured to fasten to the top of a water storage tank. There, the offset mounting bracket, can provide a surface to mount a heat engine that otherwise would not fit onto the water storage tank structure.

A thermosiphon system for hot water heaters. In an embodiment, the thermosiphon includes a multi-tubular structure which in an embodiment is insertable through the cold water connection in a hot water tank in order to provide for a thermosiphon action in the hot water heater, to keep water circulating and prevent temperature stratification of water in the tank. In another embodiment, a thermosiphon design is fabricated within a water heater tank at the factory.

A horizontal water boiler is disclosed. The water boiler comprises a tank assembly, an expansion assembly, a control assembly, and a casing assembly. The tank assembly comprises a tank body having a water storage cavity, a tank cover, an insulation component for preventing the passage of heat, a heating tube for heating up the water entering the water storage cavity, and a water flow assembly for allowing water inflow and outflow. The casing assembly is configured for supporting the tank assembly and the expansion assembly; and the casing assembly comprises an installation portion for connecting to a waste disposer. Water from the outside is introduced into the water storage cavity through the inflow pipe and the first pipe, and heated water is led out from the second pipe and the outflow pipe for use.

A horizontal water boiler is disclosed. The water boiler comprises a tank assembly, an expansion assembly, a control assembly, and a casing assembly. The tank assembly comprises a tank body having a water storage cavity, a tank cover, an insulation component for preventing the passage of heat, a heating tube for heating up the water entering the water storage cavity, and a water flow assembly for allowing water inflow and outflow. The casing assembly is configured for supporting the tank assembly and the expansion assembly; and the casing assembly comprises an installation portion for connecting to a waste disposer. Water from the outside is introduced into the water storage cavity through the inflow pipe and the first pipe, and heated water is led out from the second pipe and the outflow pipe for use.