Solder Reflow Ovens for SMT Heller Industries offers several models of horizontal solder reflow ovens to fit the need of any soldering process requirement. Our latest generation of reflow ovens, the MK7 reflow oven , provides unparalleled performance with exceptional efficiency. All MK7 smt solder reflow ovens have a low height top shell and double insulation, which reduces energy and Nitrogen usage during production by up to 15%.