Dating back to 2011, Philly is 8-2 at the Consol Energy Center when a dog (not sure if they have ever been favored since that time). They're two losses in Pittsburgh came 3/24/2013 (2-1 loss) and 4/7/2012 (4-2 loss).
The last three games there between these two have gone over and, dating back to 2009, there have only been three games where less than 5 goals were scored total (3/22/09, 3/24/13, and 11/13/13).