I live in the same climate Denise does, NorCal, and I do none of the above and my boat is stored outside, hers is going to be inside. A thermostaticly controlled heater next to the engine, a small fan and the battery tender all stay on from dusk till dawn. I have never drained my block, I dont want all the rusty water stains in my bilge, never used stabilizer over the winter, just fill the tank, never do antifreeze or any of that other stuff. Start the engine or at least turn it over once or twice a month to change the position of the impeller and valvetrain and thats it. No issues in 12 years. I know that even on the coldest night here, the temp in the engine area never gets cold enough to freeze anything but I keep the heater in there just for peace of mind. For years it was just a 75 watt bulb in the engine area and that always worked fine. Only issue I ever had was my first boat, a flat bottom speed boat with the engine fully exposed to the open air, popped the freeze plugs one night when it got down in the twenties overnight. (very rare here).
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