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A. O. Smith: VF Series Variable Fire Boiler, Up to 88% Efficient, Hydronic Boiler with Modulating Fire 4:1 Turndown, VB Model

VF Series Variable Fire Boiler, Up to 88% Efficient, Hydronic Boiler with Modulating Fire 4:1 Turndown, VB Model by A. O. Smith
Model Number - VB
Types/Specifications
  • 1
Cold Water Connection Size 2" NPT
Country United States
Flow Rate 21 GPM-120 GPM
Frequency 60 Hz
Gas Connection Size 1" NPT
Heating Options Natural Gas, Propane
Hot Water Connection Size 2" NPT
Industry Standards Meets or Exceeds Texas and California SCAQMD Rule 1146.2 Air Quality Standards, Meets ASHRAE/IESNA 90.1-1999, Category IV Listed
Input Rating Btu per hr 500000 Btu/hr, 750000 Btu/hr, 1000000 Btu/hr
Manufacturer Product Line VF Series
Maximum Pressure 160 psi
Nominal Height 4' 8", 5' 2", 5' 11"
Nominal Length 3' 1"
Nominal Width 2' 6"
Number of Phases 1
Output Rating Btu per hr 421500 Btu/hr, 633750 Btu/hr, 845000 Btu/hr
Region North America
Shipping Weight 450 lb, 575 lb, 750 lb
Thermal Efficiency 88%
Voltage Rating 120 V
Description
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The VF™ Boiler series delivers an exceptionally high thermal efficiency by combining an advanced modulating venturi-mixing gas/air ratio system with a vertical multi-pass copper heat exchanger for outstanding efficiency of up to 88% and low NOx emissions that meet or exceed the most stringent standards.

The VF™ Boiler is capable of firing from 100% to 25% or a 4:1 turndown ratio of rated input based on the current system demand. The VF’s modulating capability is virtually limitless, and the boiler’s output is based strictly on the current system demand and the required BTUs needed to maintain the desired system set point temperature.
  • Up to 88% Thermal Efficiency
  • Heavy-Duty Rust-Proof Copper Finned Tube Heat Exchanger
  • Remote Temperature Sensor for Storage Tank or Primary Heating Loop
  • Low-NOx Meets or Exceeds Clean Air Requirements
  • Digital Current Boiler Status Display with Help Screens and Any Boiler Fault Readout
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