Hello! My I make a small suggestion? Stay waway from the carbon panels- they don't do well. i sat in one recently and it didnt feel right nor like a quality set up. Panels were thinly lined and didnt get really hot. If you insist though, costco is selling some off for about a thousand. Check soon-its a seasonal item for them.
Any way my suggestion is get a used Healthmate. Try craigslist. They are the oldest manufacturer in America, use genuine ceramic emitter tubes and get really hot! I just got one a few weeks ago, a 1985 2 seat, 4 heater model that heats up in 5 minutes up to 190, works perfect. Testiment to excellent workmanship. Speak to their repair folks at the factory, or one of their sales rep.
Anyway I paid $350 for mine just becasue its so old...Good luck!