A burner device (200, 220, 240), comprising: a temperature-sensitive magnetic valve (104, 124, 144, 204, 224, 244, 300, 400, 500, 600, 700, 800) for directing a flow of gas to flow through a first pathway (106, 126, 146, 206, 226, 246) or through a second pathway (108, 128, 148, 208, 228, 248), the valve (104, 124, 144, 204, 224, 244, 300, 400, 500, 600, 700, 800) being configured to be in fluid connection with a gas source and comprising: a magnet (318, 420, 536, 644, 864); and a ferromagnetic material (316, 422, 534a, 640, 752a, 752b, 866) presenting a curie-effect temperature, the ferromagnetic material (316, 422, 534a, 640, 752a, 752b, 866) being in magnetic connection with the magnet (318, 420, 536, 644, 864) when the ferromagnetic material is at a temperature below its a curie-effect temperature and being magnetically decoupled from the magnet (318, 420, 536, 644, 864) when the ferromagnetic material is at a temperature above its a curie-effect temperature, said ferromagnetic material (316, 422, 534a, 640, 752a, 752b, 866) preferably comprising a nickel-containing material; a flow control structure (314, 534b, 643, 757, 826a) forming the first pathway (106, 126, 146, 206, 226, 246) and the second pathway (108, 128, 148, 208, 228, 248); the burner device further comprising: one or more first burner outlets (112, 132, 152, 212, 232, 252) in connection with the first pathway (106, 126, 146, 206, 226, 246) so as to enable the gas to be delivered via the first pathway to a combustion chamber by exiting through the one or more first burner outlets (112, 132, 152, 212, 232, 252), the first burner outlets (112, 132, 152, 212, 232, 252) having a cumulative first cross-sectional area; the burner device being characterized in that: one or more second burner outlets (114, 134, 154, 214, 234, 254) are in connection with the second pathway (108, 128, 148, 208, 228, 248) so as to enable the gas to be delivered via the second pathway to the combustion chamber by exiting through the one or more second burner outlets (114, 134, 154, 214, 234, 254), the second burner outlets (114, 134, 154, 214, 234, 254) having a cumulative second cross-sectional area; and in that the cumulative second cross-section area is greater than the cumulative first cross-sectional area. a magnet (318, 420, 536, 644, 864); and a ferromagnetic material (316, 422, 534a, 640, 752a, 752b, 866) presenting a curie-effect temperature, the ferromagnetic material (316, 422, 534a, 640, 752a, 752b, 866) being in magnetic connection with the magnet (318, 420, 536, 644, 864) when the ferromagnetic material is at a temperature below its a curie-effect temperature and being magnetically decoupled from the magnet (318, 420, 536, 644, 864) when the ferromagnetic material is at a temperature above its a curie-effect temperature, said ferromagnetic material (316, 422, 534a, 640, 752a, 752b, 866) preferably comprising a nickel-containing material; a flow control structure (314, 534b, 643, 757, 826a) forming the first pathway (106, 126, 146, 206, 226, 246) and the second pathway (108, 128, 148, 208, 228, 248); one or more second burner outlets (114, 134, 154, 214, 234, 254) are in connection with the second pathway (108, 128, 148, 208, 228, 248) so as to enable the gas to be delivered via the second pathway to the combustion chamber by exiting through the one or more second burner outlets (114, 134, 154, 214, 234, 254), the second burner outlets (114, 134, 154, 214, 234, 254) having a cumulative second cross-sectional area; and in that the cumulative second cross-section area is greater than the cumulative first cross-sectional area.