Review on High-performance Hygger Titanium Aquarium Heater: Fast Heating & Digital Temp Control for 60-180 Gallon Freshwater Marine Tanks by April Simpson

To heat a 7 foot diameter by 18 inch deep outdoor pond in the winter. I placed it under the rain-protected edge of the pond where it would be dry and out of reach of raccoons and other small hands. The heater plate's wire was long enough to be placed in a clay pot in a pond without touching the rubber liner, although the slotted, durable plastic housing prevents contact. I used this in Orlando, Florida from October to March. Our Mollys, Swords, Platties, Kori are all alive and have been at the desired 80 degrees all winter. The volume of the pond is about 430 gallons and its electric heater costs about $20 a month to heat it to 80 degrees. We disabled the fountain feature on cold days to reduce air cooling of the heated water.