In our earlier works we have shown the efficiency of beta-BaB2O4 crystal growth in the heat field of three-fold axis symmetry. In order to involve the whole body of the high temperature solution in the convective motion it is very important to achieve vertical temperature distribution with the 'hot points' at the lower part of the growth crucible. At the same time to prevent crystal overgrowth and contact with the crucible wall, the temperature of the latter at the high temperature solution surface must be higher than the crystallization temperature. In order to accomplish such temperature distribution two-zone heating furnace with three heating sectors in each zone has been developed. Load commutator executes power distribution on heating sectors during the growth run. We suppose that developed heating furnace and the system of thermoregulation allow one to achieve stable thermo-gravitational convection in the whole body of high temperature solution, thus substantially delaying the onset of constitutional undercooling. (C) 2010 Published by Elsevier B.V.