I'm on a dock on the Occoquan (Potomac) R. in Va. My slip neighbor 3 slips down uses one de-icer and it keeps a large area pretty free, often to my boat (35' or so away) ... I don't know how to equate that, though, to Lake Ontario conditions which are much more severe (we don't ice in every winter) ... 2 de icers sounds like it could well be the ticket.
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Pearson 26 #1200