As the Sloan's stated, as long as you are using a Helix 1500 Watt system, you can use that. I have 2 1500 watt systems, and have been using them for over 5 years. I have one on my incubator that is controlling flexwatt, and I have one that is plugged into an oil filled heater that is heating my baby room. I am ordering another one now to run a seperate oil filled heater in my new walk in incubator. It is a great thermostat, and very robust.