It's cold water. What could possibly go wrong?

I have a 35’ formula w/ inboard/outboard mercruisers. basically i’ve had it hauled and winterized the past 2 seasons. this year im leaning toward leaving her in all winter. what, if anything, do i need to worry about? thanks

if you use it regularly, you shouldnt have an issues, unless it gets really cold, you could have some freezing in the engine compartment.
also bilge pumps

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put an engine room heater in it

light bulbs have worked well for me in my twin inboard gas Bertram both in the water and on the tra. I use double 150 W on each side rember heat risrs! good luck