Separated combustion means safety. The T-Class™ TUA is available in a range of sizes, with heat outputs ranging from 45,000 to 75,000 Btuh. Each size features a space-saving, low-profile design, and can run on your choice of propane or natural gas. In areas with excessive dirt, dust, humidity or negative pressure, reliable area heating can be difficult. But the T-Class TUA separated combustion garage heater delivers abundant warmth safely and effectively.