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 combined hot water and air heating and conditioning system including a first heat exchanger, a heat pump, a chilling tower loop, a burner and a second heat exchanger to provide hot water, air heating and air cooling. The system provides hot water, air heating and cooling all in one single unit. The system utilizes a heat pump to remove heat from ambient air and transfer the rejected heat into a hot water system, thereby using waste heat to heat the hot water system. The system utilizes a heat exchanger not only for the purpose of transferring heat from a heating source to a fluid in the heat exchanger but also for the purpose of dissipating heat from the fluid in the heat exchanger to the surroundings of the heat exchanger, thereby allowing a heat pump to act both as an air heating and conditioning device.

A system for supplying a regulatable inflow fitting, a vehicle with such a system, and a method for filling such a system. The system for supplying the regulatable inflow fitting with temperature-controlled water includes a cold water feed, a water heater, a bypass line and a mixing valve. At an input side, the water heater is connected to the cold water feed. At an output side, the water heater is connected to a hot water inlet of the mixing valve. The bypass line directly connects the cold water feed to a cold water inlet of the mixing valve. The mixing valve is connected at the output side to the inflow fitting and is configured to provide temperature-controlled water depending on a valve position. A flow element is integrated in the bypass line that at least temporarily at least limits a flow rate through the bypass line.

A hot water supply system provided on a water pipeline, which includes a water inflow side and a water outlet side. The hot water supply system includes a plurality of water heaters; each includes a conduit, a heating device, a calculating unit, and a control unit. The conduit includes an inlet section, an outlet section, and a heating section in sequence, wherein the inlet section and the outlet section are connected with the water inflow side and the water outflow side respectively; the heating device heats the heating section; the calculating unit estimates a heating workload needed. If the heating workload of any water heater exceeds a predetermined upper limit workload thereof, the control unit of one water heater controls the other idle heating device to heat water, which ensures that water temperature of water provided to the water outflow side would reach a demanded water temperature.

Disclosed is a method of mapping an in-building water supply installation having multiple controllable water outlets, the installation including a supply of water; in a water flow path between the supply of water and the controllable water outlets, a flow measurement device and a flow regulator; a processor being operatively connected to the flow measurement device and the at least one flow regulator. The method comprises opening a first of the water outlets and processing signals from the flow measurement device with the processor at least until a first flow characteristic is determined; closing the first of the water outlets; repeating the opening, processing and closing operations for each of the other water outlets to determine for each controllable water outlet a respective flow characteristic. Subsequently the processor is configured to; identify the opening of a particular one of the plurality of controllable water outlets based on the similarity of a detected flow characteristic to a respective flow characteristic; and control said at least one flow regulator, based on the identification, to control a supply of water to the identified controllable water outlet.

This invention relates primarily to an electric heater based tankless water heater, though some aspects may also apply to a natural gas or other fuel based tankless water heater. In particular aspects relating to smart communication and coordination of the tankless water heater with other devices, which may be electrically powered or powered by other fuels, may also apply to non-electric flow through fluid heating systems. The subject tankless water heater invention incorporates several aspects relating to energy and construction efficiency which will be detailed further. These include both physical aspects, such as coatings, tubing and heater element design, and electrical aspects, such as power control for individual heater elements, which can make the tankless water heater more compact and more efficient in operation, with reduced instantaneous and long term load on electrical supply systems.

An immediate hot-water supplying system 1 includes a P hot water supply device 10 configured to heat water flowing through a first supply pipe 2, an N hot water supply device 30 configured to heat water flowing through a second supply pipe 3, a check valve 6, and a coupled controller 60 configured to, when the flow amount detected by a second flow amount sensor 34 is equal to or more than a hot-water-supply detection flow amount, perform a hot-water supply operation in which a first burner 12 or a second burner 32 is burned with a circulation pump 16 stopped, and when the flow amount detected by the second flow amount sensor 34 is less than the hot-water-supply detection flow amount, perform a circulation heat keeping operation in which the first burner 12 is burned with the circulation pump 16 activated.

Water heater (10) comprising a gas burner (11) being configured to combust gas if a heat demand is present, namely if heated water is requested by at least one water consumer (24), further comprising a heat exchanger (17) being configured to heat water using the thermal energy provided with the combustion of the gas, wherein the heat exchanger is a condensing heat exchanger, further comprising an input pipe (18) being configured to provide water to be heated to the heat exchanger (17), further comprising an output pipe (19) being configured to provide water heated by the heat exchanger (17) to the at least one water consumer (24), further comprising a siphon or trap (22) being configured to collect condensate resulting at the condensing heat exchanger (17) during operation of the water heater (10), further comprising a first connection pipe (21) and a valve (23) acting together with the first connection pipe (21), both the first connection pipe (21) and the valve (23) being configured to guide a water heated by heat exchanger (17) from the output pipe (19) to the siphon or trap (22), and/or to guide water not heated by the heat exchanger (17) from the output pipe (19) to the siphon or trap (22).

A fluid control device includes a housing and a fluid temperature control assembly. The housing includes a first inlet, a second inlet for receiving a fluid, and a first outlet through which a fluid of a third temperature flows. The fluid temperature control assembly is in the housing, with apertures for regulating fluid communication between a mixing cavity and the first inlet of the housing, apertures communicating with the first outlet. The fluid temperature control assembly modifies properties of the apertures for regulating the amount of fluid having a first temperature relative to the amount of fluid having a second temperature with the mixing cavity, thereby maintaining the fluid discharged from the first outlet at a predetermined temperature.

A hot-water supply system 1 comprises a temperature responsive valve 61 provided in a first bypass passage 60, an orifice 31 provided in a second bypass passage 30, a flow rate sensor 24 provided in a water supply passage 11 downstream from a connection point with the second bypass passage 30, a circulating pump 33 provided in the water supply passage 11 downstream from the connection point with the second bypass passage 30, and a controller 4. The controller 40 operates the circulating pump 33 and executes circulation heating operation for operating a burner to heat the hot water circulating through a circulation circuit 80, when a flow rate detected by the flow rate sensor 24 is equal to or more than a specified flow rate.