This is a big deal!
Letting the pipes freeze in a cabin is probably nothing I would do as the ice can expand and bust a pipe - and you wouldn't find out until the pipe thawed. But in a boat, this stuff is much more dangerous. The pipes are hoses and may not be as capable of withstanding frozen water and the expansion. But the slightest crack could ultimately cause your home to find its way to the bottom.
Freezing temperatures can mean crushed hulls, broken blocks, broken lines/hoses, etc. If water finds its way into crevices in the deck, any subsequent freezing will open up seams.
Lots of people who intended to warm the interior of their boats forgot about warming the interior of the engine compartment and every interior space where the hoses are run. In this kind of condition, it is often best to cover or wrap the boat if, for no other reason, to keep the moisture off the deck and trap heat as best as possible. I would use anti-freeze in the lines and would even use anti-freeze in a bucket as water to flush the head.
The Essentials of Living Aboard a Boat
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The Essentials of Living Aboard
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