The present invention relates to a mid-infrared radiation health appliance comprising a lower first portion, and an upper second portion. The portions are arranged so as to define between them a space for the reception of a user. One or more infrared emitting elements are mounted in the first portion, and one or more infrared emitting elements are mounted in the second portion. The one or more infrared emitting elements are emitting infrared waves at a frequency of within 6-14 microns. The lower portion comprises a first cover plate adapted for supporting the weight of the user, and facing the space for the reception of a user. The first cover plate is made of a) a thermoplastic material that must transmit more than 50% of the infrared waves emitted by the one or more infrared emitting elements, or b) a plate glass that must transmit more than 50% of the infrared waves emitted by the one or more infrared emitting elements.
