Our Energy Master takes warmth to a new level by offering increased heat output, higher efficiency and a bountiful 42˝ view of the fire. Designed with double walls on the sides and top where heat collects, it traps heat that radiates through the first wall and is lost in traditional fireplaces. With warmth radiating through a separate convection chamber in concert with additional heating tubes, you’ve got ample heat for any sized room. And a firebox that’s seam locked, preventing air leakage and enhancing the draft.