Monoblock gas burners from 17 kw to 500 kw models available with different whether included, Burner controllers or excluded digital informative display high efficiency fan ventilation system hpv allowing easy burner, Boiler matching even with high combustion chamber pressure combustion head easy to assemble and adjust the hinge flange allows quick reach to the burning phase head without losing the original settings max gas 350 and max gas 500 all models are available to collaborate with 50 and 60 hz electrical frequency