A combustion system such as a furnace or boiler includes a perforated reaction holder configured to hold a combustion reaction that produces very low oxides of nitrogen (NOx).

A method for heating a furnace with a longitudinal direction and a cross plane which is perpendicular to the longitudinal direction, which furnace includes at least one heating zone heated using combustion of a fuel with an oxidant, and which furnace is further arranged with a dark zone downstream of said heated zone, to which dark zone no fuel is supplied directly. Wherein the fuel and oxidant supplied to the heating zone is substoichiometric, in that between 10% and 40% of the total oxidant for achieving stoichiometric or near stoichiometric combustion is supplied directly to the dark zone, a flue gas temperature is measured in and/or downstream of the dark zone, and the share of the total oxidant supplied to the dark zone is controlled so as not to exceed a predetermined maximum measured such temperature. The invention further relates to a method for retrofitting an existing furnace, and a furnace.

A digital gas cooking appliance is disclosed. The digital gas cooking appliance has the ability of self-initiating an automatic calibration process to determine an optimum valve position to be used for an electromechanical valve when igniting a gas cooking element by performing a plurality of ignition sequences for the gas cooking element at a plurality of respective valve positions of the electromechanical valve. During each of the plurality of ignition sequences, a respective ignition duration between a start of the respective ignition sequence when an igniter is active and the electromechanical valve is open, and a flame is detected by a flame detector, may be determined.

Food cooking unit composed of gas burners (1) and an ignition source (2) feed with gas through regulation electrovalves (3) and an ignition source electrovalve (13); a food monitoring sensor (5) focused towards the cooking zone and/or a weight sensor (15); at least one thermocouple (6) in thermal contact with the flames and in connection with a safety electrovalve (4) and an electronic control device (7) connected to said food monitoring sensor (5), to said at least one regulating electrovalve (3) and to the ignition source electrovalve (13) 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 food monitoring sensor (5) and/or from the weight sensor (15) and/or the thermocouple (6).

Gas cooking appliance including at least one burner and an ignition device configured to ignite the burner. The ignition device includes a pulse generator configured to send at least one electric pulse for the purpose of generating a spark to ignite the burner. The cooking appliance also includes a flame detector configured to detect the presence/absence of a flame in the burner. The pulse generator is in electrical contact with a part of the burner and the flame detector is connected to ground. The cooking appliance further includes insulating means that insulates the burner with respect to ground, such that when the pulse generator sends at least one electric pulse, an electric spark capable of igniting the burner is generated between the burner and the flame detector.

A device for controlling a fuel-oxidizer mixture for a premix gas burner, comprises: an intake duct for admitting the mixture into the burner; an injection duct, connected to the intake duct to supply the fuel; a monitoring device for checking the state of combustion in the burner; a gas regulating valve; a fan located in the intake duct; a control unit for controlling the speed of rotation of the fan between a first and a second rotation speed, corresponding to a minimum flow rate of oxidizer (Qmin) and a maximum flow rate of oxidizer (Qmax), respectively; a regulator coupled to the intake duct and having a first aperture, adjustable through a first shutter, and a second aperture, adjustable through a second shutter. The control unit is configured to drive the gas regulating valve in real time.

A backlit temperature control knob for water heater valves used with water heaters and more particularly to gas water heaters provides a way to read the temperature indication not previously known in the art. Some embodiments rely on a thermocouple or thermopile normally used to power a safety magnet with the pilot light system as a source of electrical energy to selectively illuminate a Light Emitting Diode (LED) which directs light through at least a portion of the knob to assist in reading the temperature indications.

A stove (1) having a combustion chamber (2) supplied by one or more air supply paths (9, 14, 16). One or more valves (11, 15, 17) are provided for controlling airflow through the one or more air supply paths (9, 14, 16). A temperature sensor (4) is used to determine the air temperature associated with the combustion chamber (2), and a flame sensor (3) is used to determine the burn intensity of a fuel in the combustion chamber (2). A controller (5) controls the one or more valves (11, 15, 17) to adjust the airflow through the one or more air supply paths (9, 14, 16) based on inputs from the flame and temperature sensors (3, 4).

A method for monitoring an operation of a gas burner system in which a fuel/air mixture is ignited and a flame is generated by a burner during operation, includes: measuring the temperature of the flame by a flame temperature measurement installation that is actively cooled by impingement with cooling air; evaluating the temperature of the flame by an evaluation installation; interrupting a fuel supply to the burner in response to the temperature of the flame dropping below a critical value or having a specific negative gradient; determining an air-fuel ratio from the temperature of the flame; and interrupting the fuel supply to the burner in the event of an anomaly in the air-fuel ratio.

The invention refers to a method for detecting anomalies associated with a gas appliance (1), the gas appliance (1) comprising at least a gas inlet (2), at least one gas burner (3) and gas distribution means (4) coupling the gas inlet (2) with said at least one gas burner (3), the method comprising the steps of: —gathering information regarding the gas flow or the operational state based on detection means (5.1, 5.2) (S20); —evaluating said gathered information in order to detect gas flow anomalies or operational anomalies, thereby obtaining evaluation information (S21); —providing alert information from a communication interface of the gas appliance (1) to a user device (6) depending on said evaluation information (S22).