Jeox;1831142; said:
I used 2 submersible EHEIM heaters during the cold nights we had Jan/Feb a few nights went to high 40s which from what I heard is rare and roughly 14 nights were lower than 60 but either way I had each set at 70 degrees as felt that was fine for night (swordtails,mollies,platys,kuhli loaches)both are 200 watts both ponds I used it in are 60 gallons worked great .
I cant fathom any submersible heater not working unless its a junk brand heater . The heater you posted doesnt seem to have heat control by pond "heater" they might mean simply not freezing.
if the pond is buried or partially it holds heat in that much better and BOTH my ponds are uncovered yet heaters worked great granted warmer within a foot of heater and the fish had accumulated there during the nights it was in 40s but not a single loss no ich,etc.
http://www.marinedepot.com/ps_ViewI...rium_Supplies-Heaters-Glass_Tube~vendor~.html
