FYI - Water does not have to be very hot to melt the ice. It does not have t be hot at all although it helps. If you have running water, a hose will breach the ice dams and wash off snow. Expect it to take a lot of water and to end up with a sheet if ice where you hosed off. You'd want to position yourself to be running the water down the slope instead of blowing up under the shingles so there will probably still be a climb involved.
I doubt too many island summer homes have running water right now but I thought I'd thow it out as a point of interest.
Good luck!
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