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Choosing a Small Gas Patio Heater If you want an outdoor heater that can heat your outdoor space without taking up too much area, you can try this model. It is able to accommodate a propane tank that weighs 20 pounds and offers a huge heating radius. It has a built in tip-over safety valve. The BTUs on this unit aren't as high as those of other models we've tested however, it's more than adequate for most