CG4 Gas Burner

Are you considering converting your home from heating oil to gas heat?

A typical oil to gas conversion includes replacing your existing oil heat boiler and all of the pipes, pumps and electrical components near the boiler. Converting from oil to gas can be costly, messy and disruptive to your home.  The Beckett CG4 conversion gas burner directly replaces only the oil burner on your oil heat boiler leaving all other system components in place saving thousands of dollars. Many brands available for conversions such as Peerless, Weil McLain, Buderus and many more popular brands.

The CG4 gas burner’s design and technically advanced components meet increasing demand for improved gas burner performance in high-efficiency appliances and modern well-insulated homes.

Our CG4 series chassis coupled with a welded insertion make a perfect match to your appliance. Performance-enhancing combustion technology utilizing proven fixed-head burner design.

  • 24 volt gas valve, 3.5″  W.C. manifold.
  • New Beckett GeniSys™ 7590 advanced gas burner control with flame rod and air proving.
  • New Beckett gas igniter.
  • Proven Beckett fixed head combustion.
  • Easy access to orifice for rate change and propane conversion.
  • Air guide provides high static pressure for smooth starts and minimal pulsation.
  • Removable gas gun assembly for ease of servicing.


  • Fixed Heads
  • F3G 80 to 140 MBH
  • F4G 130 to 190 MBH
  • F6G 180 to 250 MBH


  • Natural Gas – .64 specific gravity
  • LP Gas – 1.53 specific gravity

Dimensions (standard)

  • Height: 14.4″ (10.3″ Chassis Only)
  • Width: 13.”
  • Depth: 15.8″
  • Air tube diameter: 4″

Electrical Characteristics

  • Motor: 120 V PSC 1/7hp, 3450 rpm
  • Power Supply: 120 V
  • Ignition: Direct Spark
  • Operating Load: 3 amps
  • Alternate Voltages or Frequency: Consult Customer Service

Ambient Operating Temperature

  • -32°F (-37°C) Minimum
  • +150°F (+65°C) Maximum


Firing Rates and Configurations

Firing Rate
(BTU/Hr.) 1
Fuel OrificesAir Tube Components 4Chassis
Components 5
Settings 6
Natural Gas Orifice
(inches) 2
LP Orifice
(inches) 3
Burner HeadNozzle P/N SuffixStatic PlateBaffleBandShutterBand

1 Firing rates are based on a 3.5″ WC manifold gas pressure and use of the appropriate orifice for the fuel being fired.
2 Air tube assemblies are provided with a full selection of the natural gas orifices appropriate to the burner head.
3 LP orifices are provided in kits containing all the LP orifices for the burner head size. Kit P/N 52309-004 is for use with the F3G head, 52309-005 is for the F4G and 52309-006 is for the F6G. The installer is responsible for selecting and installing the appropriate orifice for the applications.
4 Burner heads and nozzles are identified with the markings shown to assure the use of compatible combinations.
5 Burner chassis are built for the highest rate configuration. The installer is responsible to add the baffle and/or change the band as required for the application.
6 Initial settings are intended for use only as a starting point for burner adjustments. They cannot make provision for all installation possibilities. It is important that you adjust your burner to your installation requirements using properly calibrated flue gas analysis instruments.

CG4 Gas Burner Manual
CG4 Appliance Guide
CG4 OEM Spec Guide (Beckett Tested or Verified Appliance List)
Guide to Power Gas Burners

CG4 Overview
CG4 Product Sheet

CG4 Gas Burner Certifications

Review Frequently Asked Questions and a list of Affected Products.

Warranty Information