The placement of the probe is very important - it's what sets your thermostat up for success. If it's not placed correctly, the thermostat doesn't have a snowball's chance to work properly.
When using a UTH, what you a actually monitoring is the temp of your heating element.
When using a UTH, you set it to whatever it needs to be so the floor above the UTH, not the air, is measuring the temperature you want it to be.
Correct! This placement tends to give the most accurate and consistent results.
It is perfectly fine to plug in multiple identical heating elements into a single thermostat as long as they don't overload the thermostat's max load.
The brand you mentioned is certainly a decent budget thermostat. I prefer to recommend the Spyder Robotics Herpstats for their safe and consistent reliability.
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