I did not realize you had both on the same outlet. 600 watts would be 5 amps. That doesn't include inrush current. The total on a wifi outlet is 10 amps. I could not find a rating for an individual outlet though. It is best to have them on seperate outlets and Inkbird controllers. Even better would be to have them on separate wifi strips. That way you only loose one of them if something happens to an Inkbird or outlet. Mine are smaller heaters since it is a 42 gallon tank. They each have their own thermostat and they are on separate outlets. I even have them set a couple degrees apart. The heater thermostats are 3 degrees higher than the Hydros setting.Thanks Danny. I also doubt it's the X4. I'm suspecting the power strip may be tripping a resettable PPTC on the outlet due to an inrush spike from the 600w of heating elements. I've moved the heaters to a non-controlled power strip for now. Not going to experiment with my tank to troubleshoot the wifi power strip.