Combustion device comprising: a burner, a side duct, and a feed duct with a connection point for the side duct, with at least one inlet and one outlet, wherein the at least one inlet of the feed duct is embodied to let a fluid flow into the feed duct, wherein the outlet of the feed duct is embodied to let the fluid flow out of the feed duct into the burner of the combustion device, wherein the side duct comprises a mass flow sensor, an inlet, an outlet and at least one flow resistance element, wherein the inlet of the side duct is connected to the connection point of the feed duct so that the side duct and the feed duct have a fluid connection to one another, wherein the mass flow sensor is embodied to detect a signal according to a mass flow of the fluid through the side duct, wherein the at least one flow resistance element subdivides the side duct into a first section facing away from the mass flow sensor and a second section facing towards the mass flow sensor and has an admittance surface for the passage of the fluid between the first and the second section, wherein the mass flow sensor projects into the side duct and wherein the connection point of the feed duct comprises a Pitot probe, wherein the Pitot probe comprises a first section with at least one inlet opening and a second section with an outlet, and the first and the second section of the Pitot probe have a fluid connection to one another, wherein the first section of the Pitot probe projects into the feed duct and the at least one inlet of the Pitot probe is embodied to let the fluid flow in out of the feed duct into the Pitot probe, wherein the first section of the Pitot probe comprises a sub-area facing towards the at least one inlet of the feed duct and a sub-area facing towards that outlet of the feed duct, wherein the sub-area facing towards that outlet of the feed duct of the first section of the Pitot probe comprises the at least one inlet of the Pitot probe. a burner, a side duct, and a feed duct with a connection point for the side duct, with at least one inlet and one outlet, wherein the at least one inlet of the feed duct is embodied to let a fluid flow into the feed duct, wherein the outlet of the feed duct is embodied to let the fluid flow out of the feed duct into the burner of the combustion device, wherein the side duct comprises a mass flow sensor, an inlet, an outlet and at least one flow resistance element, wherein the inlet of the side duct is connected to the connection point of the feed duct so that the side duct and the feed duct have a fluid connection to one another, wherein the mass flow sensor is embodied to detect a signal according to a mass flow of the fluid through the side duct, wherein the at least one flow resistance element subdivides the side duct into a first section facing away from the mass flow sensor and a second section facing towards the mass flow sensor and has an admittance surface for the passage of the fluid between the first and the second section, wherein the mass flow sensor projects into the side duct and wherein the connection point of the feed duct comprises a Pitot probe, wherein the Pitot probe comprises a first section with at least one inlet opening and a second section with an outlet, and the first and the second section of the Pitot probe have a fluid connection to one another, wherein the first section of the Pitot probe projects into the feed duct and the at least one inlet of the Pitot probe is embodied to let the fluid flow in out of the feed duct into the Pitot probe, wherein the first section of the Pitot probe comprises a sub-area facing towards the at least one inlet of the feed duct and a sub-area facing towards that outlet of the feed duct, wherein the sub-area facing towards that outlet of the feed duct of the first section of the Pitot probe comprises the at least one inlet of the Pitot probe.