Gas delivery apparatus, to feed at least one burner in an apparatus fed with gas or with an air-gas mixture, wherein said gas delivery apparatus has a delivery pipe that extends from a gas entrance end to a gas delivery end, there being present, along said delivery pipe: - an entrance component having at least one electrovalve (18a, 18b), and cooperating with at least one first aperture present in said delivery pipe, said at least one electrovalve (18a, 18b) being positioned on each occasion with respect to said first aperture in relation to the action of at least one electrically-fed coil; - a pressure regulator of the servo-regulated type, provided with a shutter cooperating with a second aperture present in said delivery pipe and configured to regulate the gas pressure in the delivery pipe in order to obtain, downstream of the pressure regulator, a substantially constant gas pressure value irrespective of the pressure of the entering gas; - a flow rate regulator configured to regulate the flow rate of the gas in correspondence with said delivery end, comprising a fixed body fixed in said delivery pipe and having a through aperture, a mobile body provided with a shutter portion mating with said through aperture, and a movement member configured to position said shutter portion with respect to said through aperture in order to define on each occasion a determinate section for the passage of the gas as a function of their reciprocal position, the movement member comprising a stem having a second end connectable to a linear actuator configured to position said stem along its longitudinal axis, characterized in that said shutter portion comprises an elastic flap which can be positioned on each occasion in relation to said through aperture by said movement member, wherein a first end of said stem is located in contact with said elastic flap. - an entrance component having at least one electrovalve (18a, 18b), and cooperating with at least one first aperture present in said delivery pipe, said at least one electrovalve (18a, 18b) being positioned on each occasion with respect to said first aperture in relation to the action of at least one electrically-fed coil; - a pressure regulator of the servo-regulated type, provided with a shutter cooperating with a second aperture present in said delivery pipe and configured to regulate the gas pressure in the delivery pipe in order to obtain, downstream of the pressure regulator, a substantially constant gas pressure value irrespective of the pressure of the entering gas; - a flow rate regulator configured to regulate the flow rate of the gas in correspondence with said delivery end, comprising a fixed body fixed in said delivery pipe and having a through aperture, a mobile body provided with a shutter portion mating with said through aperture, and a movement member configured to position said shutter portion with respect to said through aperture in order to define on each occasion a determinate section for the passage of the gas as a function of their reciprocal position, the movement member comprising a stem having a second end connectable to a linear actuator configured to position said stem along its longitudinal axis,