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Grant Vortex Outdoor


IITC CODE Model Outputs
GCM5070 50-70,000Btu/hr (15-21kW)
GCM5090 50-90,000Btu/hr (15-26kW)
GCM90120 90-120,000Btu/hr (26-36kW
GCM120155 120-155,000Btu/hr (36-46kW)
GCM155200 155-200,000Btu/hr (46-58kW)
GCM200240 200-240,000Btu/hr (58-70kW)


A high efficiency condensing range of free standing external oil-fired boilers
designed for situations where internal space is at a premium.

The range of external modules features the ‘award winning’ unique Grant Vortex heat exchanger and have some of the highest efficiencies available in the market today.

• High efficiency SEDBUK ‘A’ Rating
• Features a Riello RDB Burner
• Whisper quiet operation
• Optional pipe entry points
• Comes complete with a factory fitted multi-directional flue
• Optional side or rear flue exits
• Includes a factory fitted frost stat preset to 5°C
• Fully approved to OFTEC Standard and EC directives
• One year manufacturer’s warranty with five year guarantee
on boiler heat exchanger


Condensing Oil Boilers
EZ Fit Flue Guide
Installer Technical Data