What type is this :)
Well, I assume you already know it's a waterlily of some sort. Where was the picture taken? That will give a good indication of whether it's hardy or not.
In my back yard I bought it thats why I dont know :)
Aha, I see. Well I know nothing about water lilies, but if anyone does they'll need to know the size of the flower and also see a leaf.
Here is a link that might be useful: Nelumbo nucifera
Lotus and grows up out of the water on a tall stem. I can't see such a stem in the picture. The leaves have a central stem, are dished and also stand above the water. To me this looks like a waterlily, ie Nymphaceae, rather than a Lotus. It has floating flat leaves. There are lots of pink/purply cultivars including hardy ones.
My water lilies are quite hardy in our pond, and I'm zone six in S.E. Ohio. However, my pond is spring fed, so the rhizomes are never frozen, even though in the worst winters, ice sometimes forms on the surface of the pond.
Thank you :)