What heaters are you using in your sump

[ksfishguy]

I use two different brands in my sump, one rena the other hydor theo, they keep my water consistent.

 

[scadarette]

For my 12g-- in my sump I use dual Marineland Stealth for years....

 

[tunerX]

I had some titanium heaters with external controllers, but they either stopped working all together or wouldn't turn off, overheating. Are you talking about heaters with built in controllers or are there controllers that you can buy and plug into a heater?

I use an external controller that controls a relay. I can plug in any heaters that I want. I was using an aquarium one but it broke. Now I use an industrial sensor and relay.