We heat our whole house with a 40 year old, durable dual fan fireplace insert that still works great. The only thing that needs attention every year or two is the fiberglass firebox door seal. If it's not airtight, carbon monoxide and smoke can enter the home instead of the chimney. This adhesive keeps it secure and is fairly easy to remove when it's time for a replacement.
Castable Refractory Cement by Rutland Products
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