A control device configured to control a power to be supplied to a heater unit. The control device cuts off the power to be supplied to a heating portion when it is determined that an event where a maximum temperature that the processing liquid within the heater unit reaches exceeds a processing liquid upper limit temperature is likely to occur even when a supply of the power to the heating portion is stopped based on an actual temperature of the processing liquid measured by a temperature detector under an assumption that a flow of the processing liquid flowing in a processing liquid supply line is stopped.

Apparatus and methods for a gas furnace are disclosed. The gas furnace includes a variable combustion control which monitors the temperature of the burner and modifies one of the amount of combustion air supplied and the amount of gas fuel supplied to the mixing chamber. The described systems can dynamically accommodate differences in air quality and gas fuel supply to provide an optimum BTU output irrespective of differences in geographic location of usage. The gas furnace can include a dynamic response unit which predicts an optimum rate of heating to maintain a target room temperature, thereby preventing unnecessary shut down and costly re-ignition sequences, and maintaining the gas furnace at an optimum BTU output level.

A fuel-fired device can include an air-moving device that mixes air and a fuel to generate a fuel-air mixture. The fuel-fired device can also include an air box that provides the air to the air-moving device, and a fuel valve that provides the fuel to the air-moving device, where the fuel valve includes a tracking port coupled to the air box, where the tracking port detects a pressure of the air box. The fuel-fired device can further provide a pressure-regulating device disposed between a pressurized component and the tracking port of the fuel valve. The flow regulating device can control, during an ignition phase of operation, an amount of the fuel provided by the fuel valve to the air-moving device.

The present invention is intended to inform a user of a maintenance timing for a superheated steam generator. The present invention includes an induction heating type or electrically heating type superheated steam generation section and an informing section. The superheated steam generation section generates superheated steam by heating steam. The informing section transmits maintenance information by employing, as a parameter, an operating temperature of the superheated steam generation section and an operating time at the operating temperature.

A method of controlling a heating system includes providing at least one heater assembly having a plurality of heater units, each heater unit defining an independently controlled heating zone, supplying power to the independently controlled heating zones through a plurality of power conductors that are electrically connected to each of the independently controlled heating zones, determining a temperature, and modulating power supplied to the independently controlled heating zones through the power conductors based on the determined temperature to provide a desired power output along a length of the heater assembly.

A heater system includes a heater bundle having a plurality of heater assemblies and a plurality of power conductors. More than one of the heater assemblies includes a plurality of heater units, and more than one of the heater units defines at least one independently controlled heating zone. The plurality of power conductors are electrically connected to the independently controlled heating zones. The heater system further includes means for determining temperature, and a power supply device including a controller configured to modulate power to the independently controlled heating zones through the power conductors based on the determined temperature to provide a desired power output along a length of more than one of the heater assemblies.

In a heating and hot water supply device including a burning means, a first heat exchanger, a circulation passage for circulating a heating thermal medium, a circulation pump, a first bypass passage, a second heat exchanger for hot water supply, a hot water supply passage, a second bypass passage bypassing the second heat exchanger, a control unit, and an operating terminal, a distribution means is provided at a branching portion of the first bypass passage and is capable of adjusting its distribution ratio for heating, or hot water supply, or simulataneous heating/hot water supply, a display means of the operating terminal is capable of providing dispalys corresponding to various types of operation.

A fluid heater includes a heating circuit, a temperature monitoring circuit, a controller, and an overheat sensing element. The controller is disposed in a control unit and is in circuit communication with a temperature gauge and a power supply switch, the controller being configured to operate the power supply switch in response to feedback from the temperature gauge to maintain the heater at a setpoint temperature. The overheat sensing element is disposed in a heater housing proximate to a thermal fuse and is in circuit communication with the controller to provide an indication to the controller when the overheat sensing element reaches an overheat temperature lower than the critical temperature. The controller is configured to operate the power supply switch to reduce or shut off power to the heating element in response to receiving the indication that the overheat sensing element has reached the overheat temperature.

A method of controlling a heating system includes: providing a heater bundle comprising a plurality of heater assemblies, each heater assembly comprising a plurality of heater units, each heater unit defining at least one independently controlled heating zone; supplying power to each of the heater units through power conductors electrically connected to each of the independently controlled heating zones in each of the heater units; and modulating power supplied to each of the heater units.

Disclosed is a thermostatic, electric storage, water heater for a water supply terminal, which mainly consists of a water storage tank (2), a heating pipe (3), a three-way water valve (16), an electrical control three-way water valve (11), a thermostatic water valve (9) for mixing hot and cold water, and a controller (13), wherein a horizontal end of the three-way water valve (16) is connected to a water inlet pipe of a hot water source, and a lower end thereof is connected to a second water inlet (17) of the electrical control three-way water valve (11). A fifth water inlet (4) on a lower end of the electrical control three-way water valve (11) is connected to a tap-water pipe, and a horizontal end thereof is connected to a third water inlet (12) of the thermostatic water valve (9) for mixing hot and cold water. Temperature signals and water flow signals from the heating pipe (3), the three-way water valve (16) and a water flow sensor (14) provided inside the thermostatic water valve (9) for mixing hot and cold water are transmitted to the controller (13). The electric water heater can quickly obtain continuous and stable constant-temperature hot water.