I'm curious as to what kind of insulation you used. When I insulated my water heater, I used foil backed fiberglass insulation and taped it in place using foil tape. The foil increases the effectiveness of the insulation by reflecting heat back into the water tank. Your wrap looks like it's a plastic material so I imagine house wrap tape would work but if you have some duck tape hanging around, that would be okay too.
A couple of other random thoughts. Never insulate the top of a gas fired water heater - you could block the chimney vent. For added bling factor, wrap your water with an additional layer silver Mylar to trap even more heat - available in large sheets as an emergency blanket in the camping aisle of your local hardware store.
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