I also find that a super works better for super frames, it does not really matter what you use super or brood box, but I do find, that it works best on a smaller area, as the air/steam get's keeps it's heat longer, I think because it's a smaller area to heat up, and melts the comb quicker, sometimes the cooling effect of the wax on the metal floor, causes the wax to start to set, so I remove the steamer metal part after 30-60 mins, and then just put on the eke. eBay ones are cheap, compared to Ts!
also do it somewhere like gravel drive, or put down tarp/polythene, do not do it on your lovely paved patio or drive!