They are equipments without heat exchanger and they use high performance combustion systems in air stream, so they can be used for comfort heating. They are fully automatic and they can be integrated or non-compact self-contained to insert in air ducts with a remote fan unit.  

These equioments are manufatured in capacities that goes from 30.000 to 6.500.000 Kcal/h and they can be provided standard from 30.000 Kcal/h to 6.000.000 de Kcal/h or with on-off control (P., P.I. or P.I.D.)