Bear in mind that a dimmer won't keep the UTH at a constant temperature like a thermostat will, it will just reduce the amount it heats up. So, suppose unregulated the UTH heats up to 50*F over ambient, which is common. With the dimmer suppose you reduce the power to the UTH so it heats up 15*F over ambient, then as the ambient in the room varies the temperature of the UTH will vary right along with it.
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