Commercial Boilers - Gas Boilers Series GM™ Boiler

The Series GM™ gas-fired cast iron boiler is the ideal choice for large residences or commercial applications, especially when a cascade application is required. When this boiler is used in single or multiple boiler installations it is designed to be vented into a conventional chimney and can work in higher pressure applications requiring up to a 100PSIG relief valve. The fully-packaged, atmospheric boiler is available in four sizes with inputs of 228 MBH to 399 MBH.




Product Details:

Type: Semi-Commercial
Construction: Cast Iron
Fuel: Gas-Fired (Natural or LP)
Input: 228 to 399 MBH
Output: 187 to 320 MBH
Venting: Natural Draft
Trim: Water
Ignition: Spark Pilot


Series GM™ Input, kW Output, kW Net Ratings Water, kW
Model Number Input, MBH Output1,2, MBH Net  Ratings Water3, MBH  AFUE1, % Thermal Efficiency2, % Combustion Efficiency2, %
GM-05 228 187 163 82.1 66.8 54.8 47.8
GM-06 285 238 207 82.8 83.5 67.7 58.9
GM-07 342 275 239 80.3 82.5 100.2 80.6 70.0
GM-08 399 320 278 80.3 82.5 116.9 93.8 81.5
  1. Output is Heating Capacity for models with inputs <300 MBH and Gross Output for models with inputs >300 MBH. Heating Capacity and Annual Fuel Utilization Efficiency (AFUE) ratings are based on U.S. Government test.
  2. Gross Output Rating, Thermal Efficiency and Combustion Efficiency determined in accordance with AHRI requirements.
  3. Net water 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.




Series GM™ Boiler Dimensions

Boiler Model Number Jacket Depth
“A”
Jacket Width
“B”
Jacket Height
“C”
Left of Jkt. to C/L of Vent
“D”
Top of Jkt. to Vent Connector
“E”
Vent Size
“F” Dia.
GM-05 25-3/4″ 19-1/4″ 35-1/4″ 9-3/4″ 29″ 8″
GM-06 25-3/4″ 22-3/4″ 35-1/4″ 11-1/2″ 30″ 9″
GM-07 25-3/4″ 26-1/4″ 35-1/4″ 13-1/4″ 31″ 10″
GM-08 25-3/4″ 29-3/4″ 35-1/4″ 15″ 31″ 10″