A furnace for a heating, ventilation, and air conditioning (HVAC) system includes a fuel valve configured to regulate an amount of fuel supplied to a burner of the furnace, a draft inducer blower configured to draw an air flow into the burner, and a controller configured to determine a target operating parameter value of the furnace, determine an air to fuel ratio corresponding to the target operating parameter value, and control operation of the fuel valve, the draft inducer blower, or both based on the air to fuel ratio.

A furnace for a heating, ventilation, and air conditioning (HVAC) system includes a fuel valve configured to regulate an amount of fuel supplied to a burner of the furnace, a draft inducer blower configured to draw an air flow into the burner, and a controller configured to determine a target operating parameter value of the furnace, determine an air to fuel ratio corresponding to the target operating parameter value, and control operation of the fuel valve, the draft inducer blower, or both based on the air to fuel ratio.

Provided is a hot and cold water mixer capable of performing stable temperature control, including a cold water supply pipe, a hot water supply pipe, a mixing pipe, flow rate adjustment valves, temperature sensors, flow rate sensors, a setting unit, and a control unit. When the control unit determines that either one of the flow rate adjustment valves cannot increase the flow rate, and also determines, by comparing the target flow rate for the one flow rate adjustment valve with the flow rate of water flowing through the one flow rate adjustment valve, that the target flow rate for the one flow rate adjustment valve is higher, the control unit calculates and updates the target flow rate for the other flow rate adjustment valve and controls the other flow rate adjustment valve based on the updated target flow rate.

A rotor is a rotor for a pump. The rotor includes a rotor core having a magnet insertion hole and having an annular shape about an axis, a permanent magnet inserted in the magnet insertion hole, and a rotor cover surrounding the rotor core from outside in a radial direction about the axis. The rotor core has a first core portion disposed on an inner side of the magnet insertion hole in the radial direction, a second core portion disposed on an outer side of the magnet insertion hole in the radial direction, and a hole separating the first core portion and the second core portion from each other. The rotor cover has a positioning portion that positions the first core portion and the second core portion in a circumferential direction about the axis.

The present invention provides a combined heating and hot-water boiler for heating and hot-water. The combined heating and hot-water boiler comprises: a main heat exchanger which heats heating water through heat exchange; a hot-water heat exchanger to which the heating water heated by the main heat exchanger is supplied, and which heats tap water into hot water through heat exchange with the heating water; and a control unit which controls the flow of the heating water having passed through the hot-water heat exchanger to control the formation of at least one of a first flow path for supplying, to an object to be heated, the heating water having passed through the hot-water heat exchanger, and a second flow path for supplying, to the main heat exchanger, the heating water having passed through the hot-water heat exchanger.

The disclosed technology relates to a solar water heating system including a tank configured to store heat transfer fluid, a solar collector in fluid communication with the tank, and a pump system in fluid communication with the tank and the solar collector. The pump system can include a first pump, a second pump, and a valve assembly. The valve assembly can direct the heat transfer fluid from an outlet of the first pump to the solar collector when the first pump is operating and can direct the heat transfer fluid from an outlet of the second pump to the solar collector when the second pump is operating. The first pump and the second pump can transfer the heat transfer fluid from the solar collector back to the tank when the first pump and the second pump are not operating.

The invention relates to a sanitary fitting that is comfortable to use for outputting mains water and prepared water of at least one preparation type, in particular filtered and/or boiling and/or chilled and/or carbonated water, wherein at least one control unit is provided for controlling the respective water flow of the mains water and/or the prepared water, and an operating unit is provided for contactlessly influencing at least one of the water flows, in particular both water flows, and for generating and forwarding control signals to at least one of the control units.

The invention relates to a sanitary fitting that is comfortable to use for outputting mains water and prepared water of at least one preparation type, in particular filtered and/or boiling and/or chilled and/or carbonated water, wherein at least one control unit is provided for controlling the respective water flow of the mains water and/or the prepared water, and an operating unit is provided for contactlessly influencing at least one of the water flows, in particular both water flows, and for generating and forwarding control signals to at least one of the control units.

A heating system configured to be connected to a heating distribution system of a building. The heating system comprises a heat pump arrangement configured to heat a fluid; a stratified heat storage device configured to store the fluid at differentiated temperatures, a mixing arrangement; and a control device for controlling the heating system. The mixing arrangement is configured to subtract fluid from the heat storage device and to regulate the temperature of the fluid entering the heat distribution system and control the temperature of the returning fluid from the heating distribution system. The invention also relates to a method for controlling such a heating system, a computer program, a computer-readable medium, and a control device.

A fluid heating apparatus according to an embodiment disclosed herein may include a burner, a heat exchanger, a first flow rate sensor that detects a flow rate of a fluid supplied to the heat exchanger, a temperature sensor that detects a temperature of a fluid discharged from the heat exchanger, and a controller that controls a first pump provided in an internal circulation flow path on the basis of the flow rate detected by the first flow rate sensor to manage the flow rate of the fluid supplied to the heat exchanger and controls an operation of the burner on the basis of the temperature detected by the temperature sensor.