This thread is for those who want to get an idea of what size heaters they need for their system. For instance:

I'm building a 475 gallon indoor pond for growing out my tilapia ...... will a 1000 watt heater be enough to heat that large of a tank, or will I need a larger heater? I'm looking at the heater that badflash has recommended in other posts from Jeffers Equine Suppy Clik ...... I'm wondering if I'll need more than one ! My problem with this is that is says it will keep a 5 gallon bucket at 110F ..... this tank will be a little bit larger I believe badflash uses these in his 100 gallon stock tanks, so I'm pretty sure that it will be OK in that small a unit, but how about almost 500 gallons?

For the winter, I had to put all my fish into two 30 gallon glass tanks, and I'm having a hard time keeping my 30 gallon tanks up to 70 with 2 - 300 watt aquarium heaters per tank turned up to the maximum temps, this is what worries me about the 1000 watt heater, will it be enough?

Any ideas?

THX? TIA jackalope