4
For your “with ducting”, it should not be an issue at all, since you have met the full requirements with ducting.
For your “Without ducting”, in general you have met the condition, as the 300 cf room has an opening to a larger space, which meets the requirement.
In your “worst-case” scenario, it would perform just like a normal electric hot water heater ...
3
First of all you should turn off the water to the house and water heater . I've had a burst pipe at my vacation home because the power failed, it got really cold and froze pipes. When the power came back on and melted the frozen water in the pipes, there was a badly cracked pipe that did a ton of damage. If you have pex plumbing that doesn't apply, but if ...
1
It depends. If you are completely shutting down your house, then you need to drain all the pipes, put antifreeze into all the traps, and so on.
edit
Based on the discussion in comments under George's answer, I'll add that the choice depends on how long you will be away. If you plan on coming up every couple weeks or so, then it doesn't really make sense to ...
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