I dunno, I have the previous model, 8595, and when you tell it to heat the water that water gets freaking hot... Like I've melted my rainbow pan that I've always been able to wash on the bottom rack in my other washers with heat boost and have had no issues. The water gets hot in these machines.. Thats with the heated dry turned off.
My KDS58 would boost to 140 and I've not melted anything, this thing must just hate plastic in the bottom rack because I've been melting stuff left and right.. Which, in its own way, is fine because its low quality plastic stuff that is stained that I'm trying as a last resort to clean but throw away anyways... I've slowly been switching my plastic stuff to glass or stoneware.
I've put pans with burned noodles, cheese, meats and what not and I haven't had a spot on them when they have come out. The only no scrub way that gets my stainless that clean is to put water in them and let them boil for a bit on the stove... I am impressed on how hot the machine gets.
I guess keep in mind that the heated wash is going to be different than the power blast plus steam option. You have the wash temp boosted to the 129 but at the end of the wash cycle, before the rinse process starts, the machine heats the soapy water to the NSF 180 steam temperatures. Thats where this machine kicks butt. After that, you'd have your rinse cycle and if you chose sanitize, it would steam again. (Heh this solves why the rainbow pan melted

)
As far as water fills, I can't exactly tell you how many times it does a complete dump and fill, I'm thinking its 4 times, but I do know that with the soil sensor, this machine will gradually dump dirty gunky water out and fill as its dumping it. Its like the dirt is collected in a reservoir and emptied every so often. When I first got my machine it drained into a mop sink. I'd watch as it drained and all it really spit out was very dirty oily water. Its impressive.
Sorry for the late night ramblings.