This 00-913149 temp control board is compatible with Vulcan Hart DEC5, ECO2D, ECO4D, ECO6D, GCO2D, HEC20, HGC20, HEC5, HEC5X, HGC40, SG4, SG44, SG4C, SG4D, SG6, SG66, SG6D, VC3ED, VC44GD, VC4EC, VC4ED, VC4ES, VC4GD, VC4GS, VC6EC, VC6ED, VC6ES, VC6GD, VC6GS, WKG, WKGC, WKGD, WKGDX, WKGX, WLGO series models.