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okay i have 2 300 watt rena okay i have it set at 77 and my water is at 82? and the light for the heater is still going on? i dotn get it one is in the sump and one is in the tank
IME heater temperature settings are notoriously inaccurate, that is, the temps stamped on the dial in relation to the real temp.
If you have a good mercury thermometer you can trust that, and subsequently ignore the heater stampings. Almost all heaters I have come across are inaccurate numbers wise but the thermostats will hold the temps well, within .5 F.
My SW has been at 80 but with more research (Thanks to folks at AA for great articles and posts) I am going to raise to around 82 F.