I don't know why, but my experience with the Bartact seat warmers is not as you describe.
I typically put them on high for just a few minutes. Can't bear them on high for too long. Switch them to low and keep them on for a bit. Even there they are too warm to leave on all the time. I have them adhered to the back of the Bartact seat covers.
The difference in our experiences could be because mine are adhered to the foam under the OEM fabric, so it has to go through the OEM fabric and the Bartact covers to get to my butt dyno, but even after 5 minutes on high I could barely feel it. I ordered the Dorman kit today. I thought I saw a thread where someone said that bartacts had a pocket for the heaters, but mine didn't have that, just the pocket for the lumbar bladder.
