We called the Miele Hot Line at 800-999-1360 and ordered a water tank for our seven year old CVA610. You might try that. Very helpful but be prepared for "sticker shock"...ours was $180.
DHD, August 2010
Same problem, but for cva610! Anyone??
Tricia (different one), May 2010
Hi Tricia ... did you ever find this? We need parts for our system also! Thanks!