The Sirio boiler is the simplest and most cost-effective system for domestic heating by solid fuel. The sturdy structure, the reasonable dimensions, the high degree of reliability gained the many years of presence in the market, make this boiler extremely interesting, both in terms of price-quality ratio, and in terms of functionality. The sizeable combustion chamber holds large quantities of wood or coal. Easy to clean thanks to its dry-finned heat exchanger and thanks to the external lever for grate riddling.