How long backup
for how long do you think you NEED the backup. Do you really need the hot water for this period?
What have past outages been, hours, days or weeks? Is it for convience or required need, as in living full time and not weekend visit?
5000 is decent size for routine backups and would handle the pump, mini fridge, lights and normal duty outlets (not several portable heaters) nor electic stove, microwave okay.
I have installed a storage tank for water above second floor. Fill early in season and close valve to run on pressure system. If power goes out, can close off pressure system and use gravity feed to wash and flush. No hot water. Use smaller generator for few lights and can cook on outdoor grill. Back to the (almost) roughing it days.
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