Patio heaters are outdoor heating devices designed to provide warmth in open-air spaces, allowing people to enjoy their patios, decks, or gardens even in cooler weather. They come in various styles, including propane, natural gas, and electric models, each offering different heating capacities and features. These heaters typically have a tall, freestanding design with a heat source at the top, radiating warmth downwards. Many patio heaters are portable, making them easy to move around, while others are fixed installations. They are popular for outdoor gatherings, extending the usability of outdoor spaces throughout the year.