That would mean he would have to have a disconnect box on the wall behind this unit then, correct? As far as the 8awg is concerned, how long could his run be before he should increase the wire gage to 6awg? I have a welder I installed in my garage that needed a double 50, and my cousin, (who is an electrician) suggested using 6awg for that high current load to avoid voltage drop, (which in turn makes heat in the wire), eliminating the potential for too much voltage drop would keep my machine running better. Now that kiln is a resistive load, if it's going to pull a high amount of current on a continuous basis, wouldn't it be better to have too much wire, than not enough. I'm not second guessing you at all, just my thoughts on the matter. This is all assuming that material costs are not an issue in the install.