Heater fired with liquid fuel

A liquid fuel fired heater, especially a vehicle heater, utilizing a liquid heat transfer medium, comprising a tube defining a combustion chamber and a pot-shaped heat exchanger mounted over the combustion chamber tube, so as to leave an annular space therebetween for conducting hot exhaust gas, said exchanger being constructed for deflecting the exhaust gas, in an axial direction, from said combustion chamber to said annular space, and having ribs on an internal lining thereof which project into the annular space, said ribs being arranged essentially radially and parallel to a central longitudinal axis of the combustion chamber and the heat exchanger, wherein at least some of the ribs are equipped, over at least a portion of their lengths, with means for vorticization of the exhaust gas;

• wherein the ribs equipped with the vorticization means are each comprised of at least one row of blades having a longitudinally extending free edge, essentially transversely running slots being provided in each blade, said slots being open in a direction away from said heat exchanger inner lining at said free edge, blade segments being formed therebetween, and said ribs are free of said vorticization means in an end portion at the vicinity of the area wherein said deflecting of the exhaust gas occurs, said end portion constituting on the order of approximately 25% of the length of the ribs, for preventing damage to said vorticization means by burning.