black cat does tend to get hot- especially at full crank. The outter edge isnt very well protected, and is metal. (keep away from anything flamable or can be melted, like a tent wall.)
Sport cat is a little safer, but puts out less BTU's. Both are very good units, We used two bkack cats in freezing temps. Its hard to tell how warm the tent *Actually* got, because the tent was a 6 person tent with 5 people inside. NOt only that, a summer tent doesnt do much for heat rentention. Especially when your friend doesnt put on the fly cover correctly. /forums/images/graemlins/doah.gif