Hearthstone: GMi 90

HearthStone’s large flush insert in cast iron and soapstone.

Quick Facts

• Heating Capacity: Up to 2,200 sq ft (HearthStone’s stated figure).
• Efficiency: 64% (higher heating value)
• Maximum Log Size: 20″
• HeatLife: 8 hours (how long you can still restart a fire from the coals with kindling).
• Fuel: Wood.
• Fan: Included.

Who It’s For

An open fireplace sends most of its heat up the chimney. You want it to heat the room instead. The HearthStone GMI 90 is for the fireplace you already have. Leave it open and it keeps costing you heat every winter.

What Makes It Special

The GMI 90 combines a flush cast iron front, in matte black or brown enamel, with HearthStone’s signature soapstone lining.

It is a non-catalytic insert with a single-lever air control: burn hot and fast, or low and slow through the night. A convection blower is included.

Soapstone absorbs the heat of the fire and radiates a gentle, long-lasting warmth that warms the objects in the room, not just the air.

Possible Downsides

• It is a wood fire. You load it, tend it, and carry out the ash.

If you want real wood heat from the fireplace you already have, the HearthStone GMI 90 is the right decision. On the coldest night, the house is warm and the fire is the reason.

Add the steel surround, surround extension, outside air kit, fire screen insert, liner hook-up collar, mantel shield, and offset liner adapter.