Vehicle heater

A vehicle heater comprising:

• a heater housing comprising a housing circumferential wall defining an air flow space for air to be heated and comprising an inlet area for an inlet of air into the air flow space and an outlet area for an outlet of air from the air flow space, the heater housing having an outlet front wall area adjacent to the housing circumferential wall;
• a burner chamber assembly unit to be fed with combustion air and fuel, the burner chamber assembly unit being disposed in the heater housing;
• and
• a heat exchanger area comprised of a heat exchanger housing having an elongated configuration in a direction of a housing longitudinal axis and around which air flowing in the air flow space flows on an outer side and heat transfer ribs provided on the outer side of the heat exchanger housing, each of the heat transfer ribs having a longitudinal edge located radially opposite the housing circumferential wall, wherein the housing circumferential wall is located at a same distance from each and every portion of the longitudinal edge of at least one of the heat transfer ribs, the radial edge of the at least one of the transfer ribs being located axially opposite the outlet area with respect the direction of the housing longitudinal axis and the radial edge comprising a first radial edge area adjacent to the longitudinal edge of at least one of the transfer ribs with respect to a radially outward direction and a second radial edge area adjacent to the first radial edge area with respect to a radially inward direction, the second radial edge area extending in a direction perpendicular to the housing longitudinal axis, the first radial edge area extending in a direction not perpendicular to the housing longitudinal axis, the housing circumferential wall having a cylindrical configuration at least in an area enclosing the heat exchanger housing and the outlet front wall area having a conically tapering configuration in at least some areas, wherein a distance of the radial edge of the at least one of the heat transfer ribs from the outlet front wall area changes from radially outwards to radially inwards in at least some areas such that the distance increases in the first radial edge area at least in the section extending along the conically tapering area of the outlet front wall area.

A vehicle heater comprising:

• a heater housing comprising a housing circumferential wall defining an air flow space for air to be heated and comprising an inlet area for an inlet of air into the air flow space and an outlet area for an outlet of air from the air flow space, the heater housing having an outlet front wall area adjacent to the housing circumferential wall;
• a burner chamber assembly unit to be fed with combustion air and fuel, the burner chamber assembly unit being disposed in the heater housing;
• and
• a heat exchanger area comprised of a heat exchanger housing having an elongated configuration in a direction of a housing longitudinal axis and around which air flowing in the air flow space flows on an outer side and heat transfer ribs provided on the outer side of the heat exchanger housing, each of the heat transfer ribs having a longitudinal edge located radially opposite the housing circumferential wall, wherein the housing circumferential wall and the longitudinal edge of at least one of the heat transfer ribs define an air flow space portion of the air flow space, the air flow space portion having a constant dimension in an axial direction, the axial direction being parallel to the housing longitudinal axis, the radial edge of the at least one of the transfer ribs being located axially opposite the outlet area with respect the direction of the housing longitudinal axis and the radial edge comprising a first radial edge area adjacent to the longitudinal edge of at least one of the transfer ribs with respect to a radially outward direction and a second radial edge area adjacent to the first radial edge area with respect to a radially inward direction, the first radial edge area being oriented in a first direction, the second radial edge area being oriented in a second direction, the second direction being perpendicular or nearly perpendicular to the housing longitudinal axis, the first direction traversing the second direction, the housing circumferential wall having a cylindrical configuration at least in an area enclosing the heat exchanger housing and the outlet front wall area having a conically tapering configuration in at least some areas, wherein a distance of the radial edge of the at least one of the heat transfer ribs from the outlet front wall area changes from radially outwards to radially inwards in at least some areas such that the distance increases in the first radial edge area at least in the section extending along the conically tapering area of the outlet front wall area.