Gives 127 sq. ft. when installed at a 3" spacing. Installation: cement slab or plywood subflooring plastic mounting brackets (included), can be installed under most types of floor coverings (ceramic tiles, slate, marble, granite, floating floors, laminates, vinyl tiles, linoleum, carpet). Hot glue sticks included. Electronic thermostat for heating cable not included. 25-year warranty (cable only - manufacturing defect).