UTH isnt getting hot enough(plastic tub enclosure)

[JRLongton]

If the temperature of the plastic is low just over the UTH try plugging the UTH into a receptacle without the thermostat to see if it's a faulty thermostat. Without the thermostat the UTH should get the plastic pretty hot. (Only do this temporarily to see if it's working)

Definitely try this experiment. If the UTH gets hotter without the Tstat than it does with, you know the Century is junk.

If you determine that the Tstat is to blame, then the least expensive and reliable Tstat is called Jumpstart, $35 on Amazon.