We get ours filled at Airgas. I think it costs more and is a pain but the guy that took over the business from our original guy let it run dry. Got to thinking one day hadn't seen him for a while, checked the tank and was runnin' on vapor. He called about 2 weeks later and said he was coming to fill it the next day, told him not to bother coming back. Short story long be sure and check your tank yourself every so often just to be safe. Some company's will store your tank for you when your not using it and keep it charged.