I would get a Ranco if all you want is heater control. The RKL is a good way to get into a basic controller that can do a little more. It is pretty easy to use and can deal with two heaters very easily.
Exactly... heaters are probably one of the most likely items in your tank to kill everything (that and bad ATO's) and should always have redundant control. I use a coralvue 800w w/ controller set about a degree higher controlled by Apex. If either fails the other will shut off if temp gets too high. If both fail an alarm from Apex. If the heater itself fails Apex will alert when temp drops too low.
heater's built in controller plugged into to a Ranco plugged into some kind of general controller like an Apex or Reefkeeper. Can't have to many backups and out of those I trust the Ranco over anything else.
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