When I was headed downtown this winter, there was a 40' at the quay just east of the silos at the foot of Bathurst St. The ice had crushed it and it was resting with water right at the coachroof. I wonder if their bubbler died.
I saw that boat too and wondered what had happened to it, only it was completely sunk.
Bubblers are meant for shallow water, places like Port Credit Marina or Frenchman's Bay. Ice Eaters are the preferred choice where waters are deeper than, I think, 15 feet.
However, Bubblers and Ice Eaters are only useful if you're in a protected harbour like Quay West, Port Credit, Frenchman's Bay.