Important Information Regarding Flood Damaged Heating Equipment

Commercial Boilers - Gas Boilers Series GM™ Boiler

The Series GM™ gas-fired cast iron boiler is the ideal choice for large residences, 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 100 PSIG relief valve. The fully-packaged, atmospheric boiler is available in four sizes with inputs of 214.5 MBH to 299 MBH.

Product Details:

Type: Semi-Commercial
Construction: Cast Iron
Fuel: Gas-Fired (Natural or LP)
Input: 214.5 to 299 MBH
Output: 182 to 252 MBH
Venting: Natural Draft
Trim: Water
Ignition: Spark Pilot

Series GM™ Input, kW Output, kW Net Ratings Water, kW
Model Number Input, MBH HEATING CAPACITY1, MBH Net  Ratings2, MBH  AFUE1, % Thermal Efficiency3, % Combustion Efficiency3, %
GM-e-05 214.5 182 158 84.2 62.9 53.3 46.3
GM-e-06 268 226 197 84.0 78.5 66.2 57.7
GM-e-07 299 252 219 84.2 87.6 73.9 64.2

1 – Output is Heating Capacity for models with inputs <300 MBH. Heating Capacity and Annual Fuel Utilization Efficiency (AFUE) ratings are based on U.S. Government test.
2 – Output Rating, Thermal Efficiency and Combustion Efficiency determined in accordance with AHRI requirements.
3 – Net water ratings based on an allowance of 1.15. 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
Jacket Width
Jacket Height
Left of Jkt. to C/L of Vent
Top of Jkt. to Vent Connector
Vent Size
“F” Dia.
GM-e-05 25-3/4″ 19-1/4″ 35-1/4″ 9-3/4″ 29″ 7″*
GM-e-06 25-3/4″ 22-3/4″ 35-1/4″ 11-1/2″ 30″ 8″*
GM-e-07 25-3/4″ 26-1/4″ 35-1/4″ 13-1/4″ 31″ 10″

*Vent diameter is determined by outlet diameter of vent reducer (provided) installed on outlet of vent damper. 8″ to 7″ reducer on GM-e-05; 9″ to 8″ reducer on GM-e-06.