Yup, like Joanna said. As long as you aren't exceeding the wattage that the t-stat can run, you can hook up as many of the SAME heat source as the power strip can hold. I have a Herpstat running 5 30gal sized UTH pads for my BP rack and tanks and still have PLENTY of wattage available.

Just a note: For optimum performance of any t-stat, from a ZooMed to a Helix, keep the wattage it runs at least 50 watts UNDER what it can take. Never push a thermostat to its limit.