If you have a wood or composite deck, you might worry about whether patio heaters are safe for decks. In short: they are safe on decks, as long as you don’t leave them running unattended and as long as they’re not in an enclosed space. There is no active flame or embers as there are with a fire pit, and the bottom of a patio heater should never get hot. Tipping is a concern, though, so be sure that your heater’s base is weighed down and steady. In storms or heavy winds, move the heater indoors to a garage or shed if possible.