A burner unit includes first and second burner assemblies supplied with a gas mixture via first and second valves, respectively. A first valve control assembly controls the first and second valves between open and closed positions. Third and fourth burner assemblies of the burner unit are supplied with a gas mixture via third and fourth valves, respectively. A second valve control assembly controls the third and fourth valves between open and closed positions. The first and second valve control assemblies are separate assemblies that are configured to cooperate to simultaneously provide a gas mixture to the first, second, third and fourth burner assemblies in respective high power settings of the first and second valve control assemblies.

A gas burner assembly has a first fuel chamber within a burner body and this is contiguous with a plurality of inner flame ports. A second fuel chamber within the burner body is contiguous with a plurality of outer flame ports. A first supply duct extends between the first fuel chamber and a carryover duct. A second supply duct extends between the second fuel chamber and the carryover duct. A related cooktop appliance is also provided.

A burner for a gas cooker that includes a burner port defining an interior area, the burner port including an opening to the interior area; one or more tubes that are coupled to the burner port and that are configured to provide mixed gas to the interior area of the burner port; a heating element that is configured to cover the opening of the burner port and that is heated by gas-generated heat; and a shielding plate that (i) is coupled between the heating element and the burner port, (ii) is configured to cover a first portion of the opening of the burner port, and (iii) is configured to spread mixed gas that is provided from the one or more tubes into the interior area of the burner port.

A gas heating device includes a main body defining a combustion chamber, a catalyst disposed in the combustion chamber, and an electric thermal device providing electric thermal energy to heat the catalyst and disposed in the combustion chamber and adjacent to a side of the catalyst.

A fuel-fired heating appliance comprises a burner and a first housing adjacent the burner so that an interior of the first housing receives combustion gasses from combustion at the burner. A heat exchanger defines a second housing with an inlet proximate an outlet of the first housing so that the inlet of the second housing receives combustion gasses from the outlet of the first housing, and wherein the first and second housings attach at an interface. A barrier extends within, and across an interface between, the outlet of the first housing and the inlet of the second housing and defines a thermal resistance that inhibits heat transfer from the combustion gasses to the interface.

A burner device (190) comprising an air intake, a burner head (192) including an ignition device, a body section (196) defining a fluid flow channel between said air intake and said burner head (192), and a gas injector (205) for injecting combustible gas into said fluid flow channel. The burner head (192) is oriented such that its longitudinal axis is substantially perpendicular to the plane in which the channel is defined and in which fluid flows, in use, along said channel.

A gas burner includes an injector holder fixable to the sheet metal of a cooking hob and provided on its base with an injector, a burner body associated with the injector holder and defining with the sheet metal a circumferential passage for the entry of primary air intended to form the combustion mixture with the gas leaving the injector, at least one cover, formed from a single piece of drawn sheet metal, positioned on the burner body and defining therewith at least one radial venturi effect chamber, wherein the cover includes a circumferential flange provided with a plurality of elongated apertures of essentially vertical extension, for passage of the combustion mixture which generates a ring of main flames.

A burner base for a stacked burner assembly to secure a uniform distribution of gas flow. The burner base couples with a top burner cover and together define an internal gas mixture chamber. The burner base includes a barrier structure along a perimeter having a plurality of structural zones. A first structural zone includes a semi-circular barrier structure having a height that is taller at a middle portion than at the end portions. A second structural zone includes an arc structure having a height that is taller than the heights of adjacent structural zone heights. A third structural zone includes a semi-circular structure having a consistent height along the structure. A fourth structural zone includes a non-raised semi-circular structure. The barrier structure is configured to facilitate the distribution of the gas within the mixture chamber.

A multi-flame burner is disclosed with burner heads, which are set up to generate at least one burner flame directed along a respective flame axis when supplied with a fuel, wherein the flame axes of respectively adjacent burner heads are inclined relative to each other. A method for preheating a workpiece, in particular a pipe or large-diameter pipe, using a multi-flame burner is also disclosed.

A fuel-fired heating appliance comprises a burner and a first housing adjacent the burner so that an interior of the first housing receives combustion gasses from combustion at the burner. A heat exchanger defines a second housing with an inlet proximate an outlet of the first housing so that the inlet of the second housing receives combustion gasses from the outlet of the first housing, and wherein the first and second housings attach at an interface. A barrier extends within, and across an interface between, the outlet of the first housing and the inlet of the second housing and defines a thermal resistance that inhibits heat transfer from the combustion gasses to the interface.