Marine Heater - 300 Pro System - 3 Outlet Announcing 4/48 Warranty 2 Hot Tubes & 1 Fixed Louver with 2 Chrome Rings 8% faster due to the new 45 degree face without increasing AMP Draw or motor size 3% Lighter than previous models Air Flow: Low 230 cfm, Med 228 cfm, High 263 cfm.