I have an Englander 25-PDVC that we just purchased from a friend. It is connected to a thermostat and we run it on 9-9 since that is the recommendation in the manual. I have checked the mode and we are running in "c" mode and the bottom three buttons are at 4-4-1. It is heating great and seems to burn very well with little ash left but we are burning through a bag of pellets about every 12 hours or so. Could someone please tell me what I might check to make the bag last longer? Thanks.