Longer smoking time
Similar to a smokebox, the glowing coal is protected from external influences (e.g. wind). This minimizes heat emission and allows for a longer smoking period. 
Easy coal replacement

"Infinite Heat"
Shishal lovers who like to smoke with lots of coals will get their money's worth with this head. On the fireplace is at least space for 4 coals. By the high edge, as many coals as desired can be added. 
For the average shisha lover, however, 2-3 coals are already enough for excellent results.
No spark/ash flight
Due to the high side walls hardly any ash remains can fall down. You are also protected from flying sparks.
The interior and your clothes will therefore remain clean and undamaged.