This is the premier 170,000 BTU tent heater. This is a direct fire propane heater. It will heat a considerable amount of space. This heater will allow you to throw 100+ person events in the middle of the winter. Granted you must close the side of your tent. If you are going to open the sides of the structure, then we recommend radiant heaters. These direct fire heaters are the best option for a closed tent event. This is a great way to achieve a heated tent!