Side channel blower, especially for a vehicle heater, comprising: - a blower motor with a motor shaft that can be driven for rotation about an axis of rotation in a blower housing, - a first blower housing area with a first delivery channel with a first delivering medium inlet and with a first delivering medium outlet, which said first delivery channel is open towards a first axial side and surrounds the axis of rotation in a ring-like manner, - a first delivery wheel, which is located opposite the first axial side of the first blower housing area and covers the first delivery channel, wherein the first delivery wheel is carried at a first end area of the motor shaft, - a second blower housing area with a second delivery channel with a second delivering medium inlet and with a second delivering medium outlet, which said second delivery channel is open towards a second axial side and surrounds the axis of rotation in a ring-like manner, - a second delivery wheel, which is located opposite the second axial side of the second blower housing area and covers the second delivery channel, wherein the second delivery wheel is carried at a second end area of the motor shaft, characterized in that, - the first delivery channel and the second delivery channel are designed essentially mirror symmetrically relative to one another in relation to a symmetry plane that extends essentially orthogonally to the axis of rotation or/and in that the first delivery wheel and the second delivery wheel are designed essentially mirror symmetrically in relation to a symmetry plane extending essentially orthogonally to the axis of rotation, and - in that the first delivery channel and the second delivery channel are arranged with an angular offset relative to one another. - a blower motor with a motor shaft that can be driven for rotation about an axis of rotation in a blower housing, - a first blower housing area with a first delivery channel with a first delivering medium inlet and with a first delivering medium outlet, which said first delivery channel is open towards a first axial side and surrounds the axis of rotation in a ring-like manner, - a first delivery wheel, which is located opposite the first axial side of the first blower housing area and covers the first delivery channel, wherein the first delivery wheel is carried at a first end area of the motor shaft, - a second blower housing area with a second delivery channel with a second delivering medium inlet and with a second delivering medium outlet, which said second delivery channel is open towards a second axial side and surrounds the axis of rotation in a ring-like manner, - a second delivery wheel, which is located opposite the second axial side of the second blower housing area and covers the second delivery channel, wherein the second delivery wheel is carried at a second end area of the motor shaft, - the first delivery channel and the second delivery channel are designed essentially mirror symmetrically relative to one another in relation to a symmetry plane that extends essentially orthogonally to the axis of rotation or/and in that the first delivery wheel and the second delivery wheel are designed essentially mirror symmetrically in relation to a symmetry plane extending essentially orthogonally to the axis of rotation, and - in that the first delivery channel and the second delivery channel are arranged with an angular offset relative to one another.