F-40 - A device for melting fango-paraffin mass for thermal therapy procedures and keeping it at a set temperature. Consists of a tank for fangoparaffin mass with a cover heating elements under its bottom and on its side wall, structure rests on a supporting frame with two legs fitted to the working table, mixer equipped with an automatic mixing arm which is started every few minutes to maintain even temperature of the mass in the container and protects the mass from delaminating. Heated drain valve of the mixer prevents the mass from congealing. Working parameters are presented on large display placed on portable panel. Electronic controller.