Canon iPF PRO-1000 doesn't ever clog, period.
First of all, a thermal nozzle is dozens of times smaller than than a nozzle with piezoelectric membrane, so there's way less space for air bubbles to gather, that are the main cause of clogging.
A thermal nozzle produces much more pressure than piezo membrane, so it's also easier to eject air bubbles, or at worst to clean clogged nozzle.
Due to the fact, that the nozzles are so small, there's 1200 nozzles per inch, so each nozzle has spare nozzle. If a nozzle becomes clogged while printing it is electronically detected and compensated in the next pass of the carriage by the spare nozzle. The clogged nozzle is then cleaned after the print is finished. At the end of each printing the print head is also covered with silicone by the wiper to prevent drying on capping station.
The printer is also automatically maintaining the print head while it's not printing - it routinely checks if the nozzles are in working condition, puts the fresh silicone on its surface. The ink carts are also agitated.
From my experience with iPFx300 and x400 series (with exactly the same maintenance system), and after 3500sqm printed on my private iPF8300 I can assure that - contrary to Epson - the amount of ink that is used for head maintenance is negligible - the thermal print head is much less prone to clogging, and way easier to unclog.
Furthermore, the fact that you don't need to control print quality, do nozzle checks, waste paper when head starts clogging in the middle of large print on expensive fine art paper, nor waste time and ink for cleanings is invaluable. I never made a nozzle check since I bought iPF6350, and then iPF8300. I also stopped staring at printer while printing and praying so it won't ruin my prints on rags and barytas - I just press print, do other things or go to sleep and collect perfect prints from the basket when they are finished.