I brought my plane to get the new Dynon transponder certified and asked what did they have to check for the IFR certification. The tech told me he had to check the heated pitot, and that I had to have one to get certified? I have never seen anything in writing requiring a heated pitot. I'm not saying it's a bad idea to have one. I have the switch and wiring installed. Just never got around to install the actual unit. But I did not think It was an IFR requirment. I ended up with a VFR cert.