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Choosing a Small Gas Patio Heater If you want a portable patio heater that can warm your outdoor space without taking up too much floor space, try this model. It is able to accommodate the propane tank of 20 pounds and comes with a large heating radius. It also has an integrated tip-over valve to ensure security. The BTUs on this unit are a bit lower than the other models we've tested but it's still more than adequate for