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Bosch 425EF Tankless Water Heater Techs & Specs Bosch Model 425 EF - Applications and Sizing BTU Input 130,000 Energy Factor .78 Average Efficiency 82% Ignition Electronic Volatage 120 VAC Exhaust Vent Size 4-inch - Sealed Cat III Vent Options Horizontal Power-Vent through a Wall Only Minimum Flow Rate (gpm) 0.5 Capacity 4.25 @ 45°F rise Weight 52 lbs. Optional Accessories FXHood Termination Vent Kit with freeze protection Bosch 425EF Tankless Water Heater Model Manual (886kb) Bosch 425EF Tankless Water Heater Model Parts (224kb) Bosch 425EF Water Valve Maintenance and Service (158kb) Bosch 425EF Cleaning Inlet Filter Screen (187kb) Bosch 425EF Measuring Gas Pressure (120kb) Bosch 425EF Removing and Cleaning Burners (180kb) Bosch 425EF Cleaning / replacing pilot orifice or replacing pilot assembly (116kb) Bosch 425EF Combustion Air Requirements (116kb) Bosch 425EF Quick Reference Chart For Measuring Flow Rates (75kb) Bosch 425EF Activation Minimun Flow Requirements (81kb) You need to have Acrobat Reader on your PC inorder to open any of our manuals. Get the free Acrobat Reader to view manuals if you don't already have it. Return to Bosch Tankless Water Heater Main Page