New 12++ Gas Firebox
New 12++ Gas Firebox. Top20sites.com is the leading directory of popular parlor stoves, gas fire log, fireplace parts, & propane fireplaces sites. The hot gases generated in the firebox are pulled through a rack of tubes running through the boiler. In a steam engine, the firebox is the area where the fuel is burned, producing heat to boil the water in the boiler. The advantages of a gas firebox are simplicity of.