Model 25-PDV Manufacture date 05/04. Unsure what the setting should be. When we are on 2 it is not warm enough and the pellets last for 24 hours. When we put it on 3 seems to get very very warm and burns a bag in 12 hours or less. Please let me know what you think or tell me what I need to adjust on the stove. Thank you very much for your help!