STK range thermo-cookers are an evolution of the ST model to which a special hydraulic kit is added, to facilitate the connection with the plumbing and heating system. This model allows the direct production of instant domestic hot water, guarantees the separation of the hydraulic system and allows to combine other heat generators. The kit installed on the thermo-cooker includes many systems, such as: circulator pump, thermal relief valve, expansion vessel and the electronic control unit to perfectly manage of the heating system. Thanks to the innovative certified combustion system H2O System®, the combustion chamber is fully covered in steel to protect the body of the boiler. Moreover, the wood burns more effectively, giving better performances, less wood consumption and emissions.