The Precision Temp unit we have actually uses less propane than the tank units we had in the past. No, it doesn't sound like a jet plane. It isn't any louder than the tank units.
Most all the negative comments about tankless units are from people that have never had one and are basing their "knowledge" on a salesman or pure speculation.
Keith
Keith and Gloria
2013 Tiffin Phaeton 36GH
2012 Jeep Grand Cherokee Overland
USAF 1968-1976 Vietnam Veteran