So I bought a new ZooMed UTH and Zilla thermostat for the new enclosure. Placed the probe on the bottom underneath the tub and duct-taped the UTH over it like the tutorial instructed. I plugged the UTH into the thermostat outlet and the thermostat into the wall outlet. I turned on the thermostat and set it to 95 F. Checked a few hours later and the UTH wasn't even warm.
Did I skip something?