Two 300 W Jagers on a ReefKeeper 2. Had a little problem with the ReefKeeper that I'll pass on to you. The lights to my heaters were coming on, but when I wrapped my hand around the heaters, no heat. I thought it odd that both heaters were shot and the light was still on, but I had extra heaters sitting on the shelf and switched them out. I threw out the old heaters and the following day the tank was still cool. Again, the lights in the heaters were on, but no heat....and these were two new heaters. Bottom line, it was the ReefKeeper. So I now run my heaters through a ReefKeeper 2 plug Expansion Socket that has its own dedicated power supply. Don't know why the ReefKeeper supplied enough juice to turn on the lights, but no heat. It works just fine now with the Expansion Socket.