Propane dryers use of electricity?

[kalakoa]

clean burning, odorless, colorless gas that is very efficient

Gas (NG, propane, butane) is 5-8x more efficient at generating heat, but is effectively 15% less powerful when used to generate electricity.

Propane has an odorant added so that humans can detect leaks.

Any gas sold as "propane" must contain at least 90% propane.