Generator and fireplaces/buddy heaters for me, about the only way for a long term outage while you are away is with an automatic generator setup. Mine is a big portable through a transfer switch, so I have to go outside to start it, and fill it with gas, but I work at home, and usually not gone long. You could run a UPS or deep cycle battery(in a ventilated area), float charger and small inverter to power an UTH, and maybe a small heat bulb if you only needed a couple hours to get home from work or so.
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