I keep hearing stories of people giving boilers a bad name by burning their home garbage. I will admit I burn the occasional cardboard or paper grocery bags in the boiler. In a dire situation to get a fire going I burned some scrap 2x4's. I remember a guy that delivered wood to me last year. I had a hard time getting the boiler going on some green wood, and his wife was with him and mentioned how some good household trash would get the fire going. I looked at him, as he had a boiler too.. he said yes we burn all our trash in the boiler and sift out the metals and stuff that doesn't burn. Months later I had a few discussions with OWB owners and they admitted to burning tires at night and even using used motor oil on the logs. I'm shocked, I can't imagine wife telling me time to take out the trash and just dumping everything into the firebox. On occasions I will use a bit of vegetable oil on the fire to help, seems to burn very clean with almost no smoke.