Omaha Fire investigators say a malfunctioning water heater sparked Monday afternoon's house fire near 47th and Orchard.

30-year-old Jermaine Charles and 31-year-old Matthew Phillips suffered burns and are being treated at an Omaha hospital.  Police say the victims' injuries are not life-threatening. Several cats died in the fire. 

After the fire was extinguished, a marijuana grow operation was found in the basement of the house. Charges are pending.