A heat therapy device comprising: a care unit comprising a lying surface for supporting an infant; a hood moveable between a closed position covering the care unit and an opened position clearing the top of the care unit; a radiation heater arranged such for irradiating the lying surface in the opened position of the hood; a convection heater; and control units (40,50,60,70,80,90) which are configured and arranged to control said radiation heater and said convection heater, wherein the control units (40,50,60,70,80,90) are configured and arranged to control operation of said convection heater as a primary heater when the hood is in the closed position and to control operation of the radiation heater as the primary heater when the hood is in the opened position, characterized in that said control units (40,50,60,70,80,90) being further configured and arranged: to operate the radiation heater in a standby mode when the hood is closed and to operate the convection heater in a standby mode when the hood is in the opened position; when the hood begins to open, to operate the radiation heater for a predetermined heating-up period at a predetermined maximum radiation heating output, and after expiration of the heating-up period to change over to a controlled operation of the radiation heater; after the beginning of the closing of the hood, to operate the convection heater for a predetermined heating-up period at an increased convection heating output, and after expiration of the heating-up period, to change over to a controlled operation of the convection heater. a care unit comprising a lying surface for supporting an infant; a hood moveable between a closed position covering the care unit and an opened position clearing the top of the care unit; a radiation heater arranged such for irradiating the lying surface in the opened position of the hood; a convection heater; and control units (40,50,60,70,80,90) which are configured and arranged to control said radiation heater and said convection heater, wherein the control units (40,50,60,70,80,90) are configured and arranged to control operation of said convection heater as a primary heater when the hood is in the closed position and to control operation of the radiation heater as the primary heater when the hood is in the opened position, characterized in that said control units (40,50,60,70,80,90) being further configured and arranged: to operate the radiation heater in a standby mode when the hood is closed and to operate the convection heater in a standby mode when the hood is in the opened position; when the hood begins to open, to operate the radiation heater for a predetermined heating-up period at a predetermined maximum radiation heating output, and after expiration of the heating-up period to change over to a controlled operation of the radiation heater; after the beginning of the closing of the hood, to operate the convection heater for a predetermined heating-up period at an increased convection heating output, and after expiration of the heating-up period, to change over to a controlled operation of the convection heater. to operate the radiation heater in a standby mode when the hood is closed and to operate the convection heater in a standby mode when the hood is in the opened position; when the hood begins to open, to operate the radiation heater for a predetermined heating-up period at a predetermined maximum radiation heating output, and after expiration of the heating-up period to change over to a controlled operation of the radiation heater; after the beginning of the closing of the hood, to operate the convection heater for a predetermined heating-up period at an increased convection heating output, and after expiration of the heating-up period, to change over to a controlled operation of the convection heater.