Thomas, re the heater, I meant for cycles other than sanitary, and was referring to these posts:
Post# 360591-6/30/2009-08:57 ||| thomasortega (Brazil)
Post# 360611-6/30/2009-10:45 ||| georgect (Connecticut)
As for bleeding the hot water pipes, there's a nearby powder room that would bleed part of the path to the washer. But it's a flow-limited faucet, and takes a long time to run hot, like minutes. (When we redo that room, we're putting in a warm-water version of an Instant-Hot, basically a point-of-use heater and faucet in one). Could also run the bathtub upstairs. Far from ideal, and fortunately I (and my wife and kids) don't have to do it. And it's nice to know that the Miele will guarantee the temperature no matter what you do or don't do.
Rayjay, I have a W4840. Very happy with how it washes, and the rinsing seems fine, no stiffness or apparent residue. For the first few months I never did an extra rinse. Then my wife started doing them (just because she believes in them), and now I do an extra rinse when I add something extra besides detergent, like oxygen bleach. Actually I do have one rinse complaint: The comforters cycle doesn't spin after the wash cycle, just goes right into rinse fill, which I don't understand. Now I do an extra rinse on comforters, though the result seemed fine without it.
There are setup menu options for extra rinse and water plus. I've never used those. Did you ever see the 2007-ish threads by crooks101 on THS about his Miele complaints? One thing I seem to remember, is that the water plus setting doesn't affect the Custom cycle. That's unfortunate, because the Normal cycle doesn't use the heater, and you'd use Custom instead. This might matter to you; it doesn't matter to me, because I haven't felt the need for extra water. If I read enough discussions here, I might start to think I should need more water

But like I said, my results are great. My point of comparison is the DD Kenmore we had for 9 years before; really no comparison at all, the Miele is so much better.