Heater Width Dim “A” Heater Parts Model Heater Side to Mid-Vent Vent Diameter (Category I) Firing Rate Heater Vent Location Dim “B” in. cm in. cm in. cm BTU/HR kcal in. cm 250 23.5 59.7 10.5 26.7 6 15.2 250,000 63 10.5 26.7 400 32.0 81.3 15.6 39.7 8 20.3 399,000 101 15.6 39.6 Specifications and Dimensions for Hi-E2 ® Series Heaters 1.06" A Specifications and Dimensions, Hi-E2 Series Heaters 23.5" Vent Collar 4.06" 6.4" 5" 3.6" 34.06" Model 350 Heater Width Dim “A” 31.9" Input 252 lbs. 16.6" 350,000 Shipping Weight 21.3" 10" 2.1" 120 3.6" 13" 2015 Zodiac Pool Systems, Inc. Product Catalog