Join Date: Mar 2006
Location: New England
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The AC heater isn't a threat to the keel, but shouldn't be left unattended on the boat, since unattended heaters are a big cause of fires on boats. Also, the cord for the heater should have a GFI built-into it... or you're running a huge risk of electrocution.
Ideally, if you plan on doing this every winter, you really should have a shorepower setup installed in the boat, with proper grounding and GFCIs to protect the boat. A regular extension cord, run into the boat is generally a bad idea for any extended period of time. A marine shorepower cord is a much safer way to do things, since the ends twist-lock into the receptacles, and have screw-down sealing collars.
BTW, a 1500 Watt heater is going to draw 12-15 amps, most extension cords aren't rated for continuous use of that kind of draw. A shore power cord is rated for 30 Amps... and can handle that kind of load without any trouble.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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