I put in a
battery backup failover generator for the house this year, for ice and wind storm outages. The wifi will stay up and house will stay warm with the furnace blower on the propane heater (also on wifi), so if I'm out of the house these give the option to turn the aquarium heaters off remotely.
Not such a big deal with the small tanks running now, but at such time I fill some of the bigger ones it could be a pretty significant draw, esp if we are out for more than a day or two