Series GM™

Products » Commercial Boilers » Series GM™

The Series GM™ cast iron, hot water boiler is ideal for use in large residences or commercial applications. This natural gas, atmospheric boiler is designed for use with a conventional chimney for simple installations.

Available in four sizes, the Series GM™ boiler features front mounted controls in the boiler vestibule for safe operation and easy servicing. Boilers are available with 30, 50, 80 or 100 psi safety relief valves, and are packaged and designed with the return piping located in the front and the supply piping at the top/front of the boiler. These features provide installation flexibility and allow the Series GM™ boiler to be used for any single, modular, or multiple boiler job.

A vertical draft hood and deluxe insulated enameled steel jacket are standard on all Series GM™ boilers. Five and six- section boilers feature a standard vent damper (optional on seven and eight-section boilers). Steel push nipples on all boilers assure a water-tight seal between sections for a lifetime of dependability.

All Series GM™ boilers are available with standard intermittent ignition provided by the Honeywell SmartValve® System. This system provides the safety and ignition functions in one device for simple, dependable operation. Five and six-section boilers are also available with optional standing pilot ignition. The Series GM™ five and six-section boilers exceed the federal standards for residential AFUE and the seven and eight-section boilers meet the ASHRAE 90.1 efficiency minimum as required by federal standards for commercial boilers.

®SmartValve is a registered trademark of Honeywell Corporation.

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Type: Semi-Commercial
Construction: Cast Iron
Fuel: Gas-Fired (Natural or LP)
Input: 228 to 399 MBH
Output: 187 to 327 MBH
Venting: Natural Draft
Trim: Water
Ignition: Standing Pilot or Intermittent

 

  • Packaged Residential/Commercial Hot Water Boilers
  • Natural Gas or LP
  • Natural Draft Venting
  • Honeywell SmartValve® Intermittent Ignition (Standard on 5-8 Section on natural gas or Spark Intermittent Ignition on LP gas)
  • Standing Pilot (Optional on 5-6 Section)
  • Steel Push Nipples

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Series GM™ Input, kW Output, kW Net Ratings Water, kW
Model Number Input, MBH Output1,2, MBH Net  Ratings Water3, MBH Standing Pilot AFUE1, % Intermittent Ignition AFUE1, % Thermal Efficiency2, % Combustion Efficiency2, %
GM-05 228 187 163 81.0 82.1 - - 66.8 54.8 47.8
GM-06 285 231 201 80.0 81.1 - - 83.5 67.7 58.9
GM-07 342 280 243 - - 79.0 82.0 100.2 82.1 71.2
GM-08 399 327 284 - - 79.0 82.0 116.9 95.8 83.2

1 Heating Capacity and Annual Fuel Utilization Efficiency (AFUE) ratings are based on U.S. Government test.

2 Output rating and combustion efficiency determined in accordance with ANSI Z21.13, Gas-Fired Low-Pressure Steam and Hot Water Boilers.

3 Net steam ratings based on an allowance of 1.15.

4 Consult factory before selecting a boiler for installations having unusual piping and pickup requirements, such as intermittent system operation, extensive piping systems, etc.

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Series GM™ Boiler Dimensions

Boiler Model Number Jacket Left of Jacket to Centerline of Vent Connector "D" Front of Jacket to Centerline of Vent Connector "E" Top of Jacket to Vent Connector "F" Vent Connector Size "G"
Width "A" Depth "B" Top to Floor "C"
GM-05 19 1/4" 25 3/4" 35 1/4" 9 3/4" 16 1/2" 29" 7"
GM-06 22 3/4" 25 3/4" 35 1/4" 11 1/2" 16 1/2" 30" 8"
GM-07 26 1/4" 25 3/4" 35 1/4" 13 1/4" 16 1/2" 31" 9"
GM-08 29 3/4" 25 3/4" 35 1/4" 15" 16 1/2" 31" 9"

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