BTU: Max: 48000 KW/H Max: 14.7kw/H. Expand Your Shared Space: Enhance outdoor living spaces with the Pyramid Patio Heater. Instant Heat: Pyramid Propane Patio Heater provides you with a steady and comfortable warmth of 48,000 BTU, it only takes a few minutes to warm up quickly, which is a great heating solution for your party in late autumn or winter.