I was using the SE-7000 up to this point, bit the driver went out, so I switched to my los SF-4000 while I haggled with Spiderfarmer to get the parts. I told them I had commercial 20A outlets, 20A, breakers, the proper sized Romex, and a surge protector rated for 25A. They came through, but I had to first switch the cord, then they thought I wired it wrong (I work in industrial maintenance & HVAC, so I knew I wired it exactly as it has been) it took a month but they honored the warranty & sent me a new driver.