Since 2006, JC BORDELET has been developing a range of closed-hearth fireplaces and stoves, in addition to its traditional open-hearth products. The goal is to generate better energy efficiency and heat recovery. Closed hearths concentrate more heat within the heating body of the fireplace through the presence of windows and the air inlet regulation system. Closed hearths significantly reduce the presence of ash through more complete combustion, and therefore facilitate maintenance. However, this requires that the windows are cleaned on a regular basis. An open fireplace provides direct warmth close to the fireplace, as well as the gentle crackling of a wood fire. Cleaning open fireplaces is far easier as they are very accessible. However, they can produce dust. JC BORDELET open hearths provide an average performance of 30%, compared to 80% for closed hearths.