2008 Silver Dealer Design Award For GMI 4M

Gasmaster industrial boiler capable of heating up to 80 apartment units.

Unique Features

  • Up to 99.8% efficient
  • 316L stainless steel heat exchanger
  • Optional designs for Natural Gas / LPG / Dual Fuel / Biogas
  • Low greenhouse gas emissions
  • LEED credits
  • Low environmental impact
  • Internationally patented
  • Single pass, tank-less
  • Certified for potable water
  • Thermal shock proof
  • Tested at 1.5 times working pressure
  • Direct Vent System Certified UL 1738 – USA & CULS636 – CAN
  • SCAQMD Listed
  • CSA Design Certified
Input 4,000,000 BTU/hr 1,172 kW 120 bhp
Output 3,840,000 BTU/hr 1,125 kW 114.7 bhp

Space Saving

Width Depth Height Floor Space Occupied
68 in 78 in 87 in 37 sq ft

10 year prorated warranty on heat exchanger against corrosion of flue gases.

OEM warranty on all other components.

20 year thermal shock warranty on heat exchanger.

Download Literature

Please Note: Actual model may differ from information provided here. For more accurate information please contact our technical support.


Product Drawings

GMI 4M Product Drawing

Component Drawings

Gas Train (Default)

Honeywell 8″-14″ wc

Gas Train (Optional)

Siemens 8″-14″ wc
Siemens 1-2 psi
Honeywell 1-2 psi
Siemens 8″-14″ wc Low NOx
Siemens 1-2 psi Low NOx
Honeywell 1-2 psi Low NOx

Note: For IRI, GEGAP, low/high gas pressures and other options please contact the factory or the authorized representative in your area.

Clearance Drawing

GMI 4M Single Unit
GMI 4M Dual Unit