I used to volunteer to water the hanging baskets in my town (they told me there were 48 of them, stretched out over 2 miles after I had done so). I used a reservoir in the back of my pickup and a Rio pump that put out about 1200 GPH. I ran it with a cheap Noma 400W power converter from Canadian Tire ($100). I used it for two hours non-stop and it lasted about 5 days, for a total of about 10 hours.
Modern powerheads and air pumps will last a long time. You could heat the area with a well vented/filtered propane heater if you wanted to save the gas or battery power.
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