Well of course you are. Even SoCal boaters should winterize some systems by sealing and waterproofing and covering against the rainy season.
But if you live in the rest of the world, where there actually is winter, and temperatures fall below freezing, there are a couple of hints, one large and one small:
First, Marelon® plumbing systems from Forespar© don’t require winterizing like bronze does. Marelon won’t freeze and crack. The small amount of water trapped in the ball valves won’t expand enough to cause damage, as the dynamic seals can hold up to the small expansion. So, while you’re in there in the spring, if you find a suspect valve and/or pipe section, replace it with Marelon. For operation and winterizing purposes, it’s much better than our old school bronze.
Second, if you’re using anti-freeze for any purposes try not to use ethylene glycol-based anti-freeze. It is not environmentally or human health friendly. Try to find virgin propylene glycol blend product (there are a couple of major brands) made for marine purposes. They will give you excellent cold weather and corrosion protection for your drinking water systems and engines, without the potentially toxic side effects. And with an additive, the propylene glycol version will prevent corrosion of aluminum and copper pipe, brass and solder, and will not harm rubber and other seals, or hoses.
It is usually fashionably pink – giving excellent blow-through visibility. And, it will not harm the water strainers and lids from Forespar and other manufacturers.
Hope this helps a little in waters where snow and ice are the norm. Both are still good ideas for year-round boaters too.
POV – Mike Dwight