Abstract: A fluid friction furnace is provided having a water jacket surrounding an enclosure partially filled with a heat transfer fluid. A plurality of rotating discs sandwiched between a plurality of stationary plates are rotated inducing the heat transfer oil into grooves in the surface of the rotating discs and circulating the oil between the rotating discs and stationary plates. Continuing pressure is applied between the rotating discs and stationary plates to generate calibrated fluid pressures in the circulation of the heated transfer fluid. By virtue of this forced friction circulation, the heat transfer fluid heats the enclosure and the water jacket surrounding the same. Circulation of the water in the water jacket throughout conventional systems provides distribution of the heat.