High output with lots of flexibility. 40,000 BTU\'s of heat is ducted to 3 or 4 separate areas of the boat, keeping everyone warm and toasty. Includes: Heater unit w/45° wrapper, 3\" x 18\' vent hose, 3-directional Euro vents, univ. mtg. brackets, wire ties, switch plate w/rocker switch and & High/Low indicator.