The problem with a UPS, is you're not going to like the price of one that can drive a 200W heater and a powerhead or two for more than 20-30 minutes.
Assume 300-400W load for your tank (on average), and you quickly start looking at $500-1000 UPSes to deal with that kind of load.
And again, UPSes arn't designed to deal with resistive loads.
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