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Choosing an Electric Pyramid Patio Heater For outdoor spaces that require warmth and ambiance patio heaters are a good choice. When choosing a heater be aware of how warm the space will be and the heat output in BTUs or watts. Electric models are portable and safe to use in enclosed spaces such as patios or garages. They require a corded source for electricity and aren't as powerful as propane models. Safety Features Patio heaters can add an inviting look to outdoor spaces, but it's also important to consider safety. Propane- and natural-gas-fueled