The Air to water chiller with integrated or substitutive boiler for heating by Frost Italy optimal for a low noise working, efficient and reliable are extremely easy to install and ask for reduced maintenance. The range of chiller units with boiler, available in heat pump or only cooling version, with scroll compressors, axial fans and integrative boiler (heat pump version) or substitutive (only cooling version) for heating, includes the series SIAL RB/HB, ATMOS RB/HB, DRACO RB/HB and TAURUS RB/HB with cooling power from 5 to 80,0 kW. The boiler is provided by a low NOx emissions and a direct firing tight combustion chamber. It is also available the model for the production of an immediate sanitary hot water. Every single unit for heating with heat pumps can be customized by terms of temperature and cooling and it is tested in our factory after production.