I'm also using Ebo-Jager heaters, ordered from Marine Depot. Actually, all my heaters are Ebo-Jager. I think those German reefers know what they're doing.
I use Ebo Jager also. They seem to maintain the temperature very precisely. They claim within .5 degrees and I believe that. I was using VisiTherm before that and had a couple of them run away on me. Luckily I was able to notice and pull them out before they overheated the tank too much.