As you say theres no worry about rinsing in hot water the one thing you might want to check is the machine spec for the intake temperature as you might find that the machinces max intake temp is 30c or 40c maybe lower
If you started feeding it with hot water above the max intake temp you could run into issues as the hoses internally wont be rated for this and you could end up with hoses colapsing or other such failures due to the fact they never expected the machine to be used on a hotwater supply and of course to cut costs use low temp hoses and fittings.
Just a thought , I could be totally wrong but its got to be worth checking before ending up with a kitchen full of hot water
You might find that even though the machine state a max temp of say 30C if you strip the panels off it and run it up and see if it does effect any of the plastic componants
AH HAVING JUST RE-READ ALL THAT I HAVE FORGOTTON THAT DISHWASERS CONTAIN A WATER SOFTNER AND I HAVENT GOT A CLUE HOW THAT WOULD REACT TO HOT WATER FILLING