crenellated wall 105 in a detailed manner which presents a plurality of radial grooves 115 at a same depth in such a way that a plurality of crenels 116 are formed on the central crenellated wall 105 said radial grooves form a plurality of main central combustion ports 117 at the joining point between the second 109 and third section 110 of said central crenellated wall 105 a circumferential groove 118 is found which forms a ring of flame 119 said circumferential groove 118 presents a v shape and the upper borders of said groove present the edges as finished off said radial groove presents an angle y which is found within approximately 80 u00b0 to approximately 100 u00b0 preferably approximately 90 u00b0 the grooves 115 which form said main central combustion ports 117 present a lower end and an upper end the lower end being broader than the upper end preferably said lower end is rounded the main peripheral combustion ports 117 present a perimeter recess some of the crenels 116 present a back section 120 which extends itself towards the first distribution channel 106 said back section 120 presents a spur 121 which extends upwardly thereof up to a height.