Info About Pricing

‘Starting At’ price is MSRP for base model from manufacturer. Exact price you pay will be higher, as pricing does not include installation, venting, taxes, fees, or accessories. Pricing is subject to change without notice. Mistakenly posted prices and/or options on the website do not obligate us to those incorrect prices and/or options. Please contact us to inquire about an estimate.

Green Mountain 90 Insert by HearthStone

Wood Burning Fireplace Insert

HearthStone’s large flush wood fireplace insert combines stylish cast iron with their signature soapstone lining. The GMi90 burns up to 20 inch logs in the soapstone lined firebox. Soapstone retains the maximum heat from you fire and radiates steady warmth as your insert burns. HearthStone’s non-catalytic wood insert is easy to use. A single lever air control lets you burn hot and fast or low and slow to keep warm through the night.

Enameled cast iron

Soapstone firebox

Simple operation

Up to 8 hours of heat

Burn logs up to 20″

Non-catalytic combustion technology

Heating Capacity

Up to 2,200 sq. ft.



Firebox Capacity

2.5 cu. ft.


1.22 g./hr.

EPA 2020 Certified



2 options available

Appliance Width 38-1/2″
Appliance Height 28-3/4″
Appliance Depth 25″
BTU’s Up to 80,000
Efficiency 64% HHV
Emissions 1.22 g./hr
Finish Matte Black, Brown Enamel
Fuel Type Wood
Maximum Log Length 20″
Firebox Capacity 2.5 cu. ft.
Flue Exit Diameter 6
Flue Exit Location Top
HeatLife 8 Hours of Heat
Heating Capacity 2,200 sq. ft.


Matte Black
Brown Enamel


Steel Surround: 94-5960010
Surround Extension: 94-5960010
Outside Air Adaptor: 94-53500
Fire Screen: 94-69600
Mantel Shield: 94-79700
Linear Hook-Up Starter Collar: 94-67500
Offset Liner Adapter: 5700-007

See if this product works for you!