configured to be longer in the direction of the floor 12 than the front side 6 of the appliance housing 4 the sidewalls 5 are each configured at least in a region 5 b that is longer than the front side 6 as closed hollow rectangular profiles such that the height adjustable supports 11 are disposed within these hollow rectangular profiles as a result of being formed in this way as closed rectangular profiles the sidewalls 5 give the appliance as a whole a stable and at the same time not too bulky overall visual appearance in order to prevent a gap which adversely affects the overall visual appearance from remaining between the bottom edge of the appliance housing 4 and the floor 12 following the height adjustment of the basic appliance body 1 the appliance housing 4 is configured such that it can be at least partially extended at the support end in the case of the embodiments that are illustrated in fig1 and 2 the appliance housing 4 is configured such that it can be extended only in the region of the sidewalls 5 as can be seen in detail from fig2 the sidewalls 5 are of double walled construction in the bottom.