AO Smith 74 Gallon Pro Line High Recovery Water Heater (LP Gas) Intended Household:5+ Person Capacity (Gallons):74 BTU Input:75100 Propane Vent Size:4" Weight (lbs):275 lbs Gas Connection:1/2" Water Connection:1" Recovery 90 F Rise:81 GPH Link To specs : /AO-Smith-FCG-75-LP-74-Gallon-Pro Line-High-Recovery-6-Yr-Warranty-Residential-Water-Heater-LP-Gas