HELLER 590059 MK3 Reflow Oven Heating Element Wire The HELLER 590059 4800W MK3 Reflow Oven Heater Element is a replacement heating component designed for compatible HELLER reflow soldering ovens. Installed within the oven heating system, this element converts electrical energy into thermal energy and works together with the blower, temperature sensor, relay, and control system to maintain the programmed reflow temperature. Stable heater performance is important for PCB