Turning your clothes into ash?
NOT to worry. I had the same concern when I got my high speed dryer, but those concerns turned out to be unwarranted. I put mine in temporarily, expecting I would play with it for a while and give it away; but I fell in love with the machine and its been here more than 10 years now. It's a much better dryer than the newer electric it replaced. CU also gave these dryers high marks when they were originally tested.
Additionally, these machines have a more powerful fan than later units and move more air [through the machine] as well, which facilitates the drying process.
22k btuh does seem to be a standard now--although I don't know exactly why--and it gives about the same or slightly better performance than a 5kW electric models. Light commercial models of several popular home dryers still use higher inputs of 30k btuh or so.