Cooktop appliances are provided. A cooktop appliance can include a gas burner; a manifold having a gas input; a primary line extending between the manifold and the gas burner, wherein the primary line operates as a non-modulated minimum gas flow line when the cooktop appliance is in an automatic mode; a secondary line extending between the manifold and the gas burner, wherein a gas flow rate of the secondary line is controllable by a flow control valve; a primary valve in fluid communication with at least the primary line; and a control system including: a sensor configured to detect a temperature corresponding to the gas burner; and a controller regulating: (i) the flow control valve in response to the detected temperature to achieve a desired temperature, and (ii) the primary valve when the flow control valve is closed and the detected temperature exceeds the desired temperature.

Cooktop appliances are provided. A cooktop appliance can include a manifold having a gas input; a first burner in fluid communication with the manifold through a first burner supply line having a first valve; and a second burner in fluid communication with the manifold through a second burner supply line having a second valve, the second burner arranged coaxially with respect to the first burner, wherein the second burner supply line comprises a primary line, a secondary line, and a sum line, the sum line providing a combined flow of gas from the primary line and the secondary line to the second burner, wherein the secondary line of the second burner comprises a third valve.

Cooktop appliances are provided. A cooktop appliance can include a gas burner; a manifold having a gas input; a primary line extending between the manifold and the gas burner, wherein a gas flow rate in the primary line is controllable by a user selectable interface; and a secondary line extending between the manifold and the gas burner, wherein a gas flow rate in the secondary line is controllable by a flow control valve.

The present invention provides a method of operating a gas heater for water including the steps of: restricting a water flow to the gas heater; determining a first rate of a first gas heating for the restricted water flow; adjusting the gas heating to the restricted water flow; repeating the previous steps until a heated water has a temperature above a temperature threshold; removing the restriction to the water flow to increase the water flow; and determining a second rate of a second gas heating for the increased water flow. The present invention also provides a gas water heater which utilises such a method.

The present invention provides a method of operating a gas heater for water including the steps of: restricting a water flow to the gas heater; determining a first rate of a first gas heating for the restricted water flow; adjusting the gas heating to the restricted water flow; repeating the previous steps until a heated water has a temperature above a temperature threshold; removing the restriction to the water flow to increase the water flow; and determining a second rate of a second gas heating for the increased water flow. The present invention also provides a gas water heater which utilises such a method.

An apparatus includes a high-pressure tank, a controller, a valve, controlled by the controller, and a heater.

A system for igniting a grill can include a solenoid valve, a flame rectification sensor, an igniter, and a control circuit connected to the solenoid valve and the flame rectification sensor. The solenoid valve controls flow of gas to the grill's burner and includes a switch that closes when a handle connected to the switch opens the solenoid valve. The control circuit sends current to the solenoid valve when the switch is closed to hold the solenoid valve open. After the switch closes, the igniter is ignited. After ignition, the control circuit monitors the presence of a flame with a flame rectification sensor. If no flame is detected after a certain amount of time, the control circuit stops sending current to the solenoid valve to close the solenoid valve.

Control unit for detecting a flame in operation using flame monitors suitable for burners operated using a fuel, wherein the flame monitor comprises at least one sensor as operating means for detecting the radiation emission from a flame as a visible reaction between fuel and oxidizing oxygen in a combustion region, and an evaluation circuit associated with the at least one sensor, the evaluation circuit determining whether the radiation received by the sensor corresponds to that of a burning flame and, if the result is negative, generating a fuel supply switch-off signal, wherein at least two flame detectors are connected in such a way that a basic electrical circuit is formed which processes the output signals of the at least two flame monitors via closing contacts in an OR operation or via closing contacts in an AND operation, depending on which of at least two operating states of flame detection is assigned to the output signals of the flame monitors, and a switching logic is provided for switching between the at least two operating states, which logic links an intelligent subsystem with a logic function plan.

Apparatus to deliver gas having a delivery pipe that extends from an entrance end to a gas delivery end along which there are, one after the other, an entrance component, a pressure regulator and a flow rate regulator coordinated with respect to each other to supply on each occasion the desired quantity of gas to a burner of an apparatus fed by gas, or by a mixture of air/gas.

Food cooking unit composed of gas burners (1), regulation electrovalves (3) of the supplied gas; an infrared sensor (5) focused towards the cooking zone; a thermocouple (6) in thermal contact with the flames and in connection with a safety electrovalve (4) through a relay (10) and an electronic control device (7) connected to said infrared sensor (5), to said at least one regulating electrovalve (3) and the relay (10) and that stores different regulation programs and that regulates the regulating electrovalve (3) and/or interrupts the thermocouple connection with the safety electrovalve in response to the signals obtained from the infrared sensor (5) and/or the thermocouple (6), and issues warnings in response to signals from the thermocouple (6).