Pellet inserts turn drafty, old masonry or manufactured fireplaces into technologically advanced heating machines.  So yeah, they're pretty special...

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Regency GI60 Cast Iron Pellet Insert with 60 lb. hopper

Regency GI60 Cast Iron Pellet Insert

Regency GFI55 Greenfire Pellet Insert with Bronze accent

Regency GFI55 Greenfire Pellet Insert

True North TN40 Pellet Insert