For almost two years SHaBean Coffee Roastery has been using a converted BBQ to roast green coffee beans. In those two years we have done 557 roasts and roasted over 2200 pounds of coffee. For ambitious amateur roasters RK Drums provides reliable conversion kits to turn gas BBQs into roasters. The price is modest compared with alternatives. The roaster does need to be outside. There are various sized drums for various sized gas BBQs depending on what quanity of beans one wants to roast. See the detailed write up for RK Drums roasters on shabeancoffeeroastery.ca