Rotamantles are specially designed to meet the laboratory requirement of stirring in the round bottom flask with simultaneous uniform heating by heating mantles. It has two tier construction with the upper compartment having heating mantle woven out of fiber glass fitted with heating element. The apparatus runs smoothly as it uses the balanced permanent magnet to induce the variable stirring action in any type of glass flasks. The stirring is done by a Teflon coated magnetic paddle to be placed in flask. The stepless speed controller controls the speed and the energy regulator controls the heating at any desired percentage of heating capacity.