Best Alternative to UTH?

[Slim]

I don't care if UTHs heat ambient air or not. I want to know what is a good heat source to provide that doesn't kill humidty that isn't a UTH....

Oh, well since you re-stated the question that way the answer gets pretty simple...Nothing.

Also, UTH's and heat tape are designed and engineered to run all the time (regulated by a thermostat), until they don't run any more, then you replace them with another UTH or heat tape that runs all the time...