I also have 2 of the Noma 400W Power packs. One for the powerheads in the tank and one for the heaters, skimmer and pumps in the sump. Last winter the power went out for about 2 hours and there was no problem. If power went out for an extended time and was particularly cold weather I would estimate about 3-4 hours of power. In that event I have access to a gas generator.
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