heater in sump

[fishmaster]

Originally Posted by Salmon King

A person told me to set the heater a couple degrees below my low temp.(76) This way the heater safeguards against the temp going so low it kills livestock.

If your heater is working properly, you should be able to set it at your desired temp, and it should only come on if the temp drops below that. If you set it low, you will likely have temp swings at night. I've found it hard to get a good heater that is always consitsant. Mine is working fine now, but I don't trust it. I'm thinking the answer is a good quality controller and probe element.