Good points, especially about redundancy. One issue i had with a standard aquarium heater is it would shut off sometimes before reaching set temperature. I was using 3 300-watt heaters. Replaced one with a hygger 500 watt and it's working better. I'm thinking of getting another Hygger but 800 watts to replace the remaining 2 300-watt heaters. The hygger seems like a much better unit than the Aquatop/Marineland heaters. Almost industrial like. Pond is 125 gallon and ambient temp is around low 60's at night. This summer i'll try to figure out a way to better insulate my single pane glass Greenhouse.
