How many BTUs do I need for my patio?

As a rough guide, larger freestanding propane heaters in the 46,000–55,000 BTU range are marketed for sizable patios and commercial-style spaces, while tabletop propane units around 11,000 BTU are designed to warm a small seating area of roughly 30 square feet. For a typical residential patio, a 40,000+ BTU tower covers a wider radius, whereas tabletop and 1,500W electric models are best treated as personal or small-group warmth.