Officials said firefighters responded to Wilson's home in Seven Fields, Pa., about 23 miles north of Pittsburgh, at 2:42 a.m. Friday and found the 50-year-old coach burned on his arms and legs, the Pittsburgh Post-Gazette reported.
Jeffrey Schueler, director of public safety in Cranberry, Pa., said Wilson was taken to the University of Pennsylvania Medical Center in Cranberry and then transferred to UPMC Mercy Hospital in Pittsburgh.
His condition wasn't available but an unnamed Steelers source told the newspaper the coach's injuries were serious but not life-threatening.
Wilson sustained burned over 30 to 50 percent of his body, the source said.
"First and foremost our thoughts and prayers are with Kirby and his entire family," Steelers President Art Rooney II said in a statement issued to the Post-Gazette. "We are saddened to hear about his unfortunate situation but we know that he has the best medical care in the country treating him."