Ground Thawing Back TD300 – Thaw Devil TD600 – Thaw Devil TD300 301,000 BTU/hr up to 4,500 sq/ft thaw area up to 6,000 sq/ft cure area Fuel Oil TD600 620,200 BTU/hr up to 7,500 sq/ft thaw area up to 10,000 sq/ft cure area Fuel Oil