That could be, as I have used propane heaters, the tubular blast kind, and they really have little smell to them. Most likely they are more efficient heaters.
2017 Escape 5.0 TA (someday soon, I hope
2015 Ford F150 Lariat 3.5L EcoBoost
2009 Escape 19 (previous)
“Most folks are about as happy as they make up their minds to be.” — Abraham Lincoln