Ceramical bricks and pieces made on al2o3 base have applience in insulation of gas boilers for heathing.
1-For insulating doors of gas boiler,fine choise is a combination of heavy and light insulation brics on Al2O3 base.
2-For flame deflector,gas boilers use a special ceramic tube of large diametar. it directs flame so that the energy is not wasted,and optimal usage of gas is established.(in the picture).