The special refractory material of the Rosin radiates a comfortable warmth into the room. This type of system has been in use in Europe for over 55 years. A. Hair line cracking is normal with refractory castables. The safety, efficiency, and longevity of the unit is not affected. Cracking can be minimized by starting out with several small fires.
Optimum efficiency is accomplished by building the fire directly on the special refractory hearth.
When using a metal grate you elevate the wood, thus drawing more cold air into the firebox and cooling the temperature of the fire. The Rosin burns wood completely, not only increasing the efficiency of the fireplace but also reducing the formation of creosote. Because of complete combustion, the resulting ashes are very fine and are easily cleaned out. No ash dump is required. The aerodynamic design of the Rosin has been completely and carefully calculated to provide a fireplace system that, when combined with a properly constructed chimney and adequately balanced room pressure, will not smoke.