My Miele fills with cold water at the end of the wash cycle (fills to the default rinse level, which is the same as "Delicates") for the cotton cycle. After a bit the water will be drained and the series of rinses will begin. On the Permanent Press cycle, the washer will add cold water as above, but drain down abit, then add more cold water, etc. This goes on several times then until the timer advances over to the first rinse.
Purpose of cooling the water in PP cycles, was to prevent wrinkling and creases, especially of man made fibers. However the machine will do this even if the water temperature selected was warm or cold or even tap cold, where there really isn't any need.
Cooling water in the cottons cycle is also to prevent creases, especially when using the boiling hot water temperatures of 160F and above.
Boilng water won't hurt your plumbing, in fact may help clear out biofilm, grease and muck as the hot water/detergent combination makes their way down. Copper and cast iron pipes can take water temperatures in excess of 200F. Not sure about PVC, but think it must belong the same lines.
Back to the Miele.
Am surprised that the washer does not add cold water towards the end of uber hot cycles. Not that you want to start messing with your new machine, but peek over on the other Miele thread where a member tells of how he "adjusted" his Miele washer to suit his tastes. Can only assume in yet another attempt to meet US government mandates about water/energy use, certian changes have been made.
If you really want to see what a boil wash can do, add 1-2 tablespoons of oxygen bleach such as Ecover. TideHE does not contain oxygen bleach, however Persil does. Nothing smells fresher than whites/lights boil washed in oxygen bleach!
L.
