I've had the same problem last year... turned out the water pump was leaking and was replaced under warranty. I topped up with distilled water prior to my appointment with the dealer.
Definitely see if water pump is the issue. I'm getting my water pump replaced in the 206TSI under warranty next week as was leaving nice coolant puddles all over the place. De-mineralised water did the trick as a temporary small top up.
VW Passat 206TSI Wagon - Lapiz Blue - Sunroof
VW Polo GTI - Black Pearl - Sunroof
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