A heater assembly and method of controlling the heater assembly is provided. The heater assembly includes a resistive heater and a substrate, and the resistive heater comprises a plurality of heating zones disposed along a perimeter of the substrate. Each of the plurality of heating zones are independently controllable such that azimuthal temperature control of the heater assembly is provided. The plurality of resistive heating elements may be connected in series and have a common ground electrical lead. In the alternative, the plurality of resistive heating elements may each have a ground electrical lead and be isolated from each other.