Spending time outside as the weather gets colder can still be fun as long as you invest in the right tools to stay warm. The ProCom 360-Degree Tank Top Propane Heater has 42k BTU output. It covers up to 1000 sq.ft of space. This 360-degree heater has adjustable settings (low, medium, high). You can attach this to a 20lb propane tank.
This heater comes with a 360-degree burner and stainless steel heat reflectors. It has auto shutoff and tip-over switch. It can deliver 9.5 hours of heat on high setting.