Many modern catalogues focus on "Hybrid" setups, where a Vitodens gas boiler works in tandem with an air-source heat pump.
: A compact floor-standing boiler with high mass water volume, designed for large residential or commercial buildings. viessmann boiler catalogue
Up to 1:10, meaning a 32 kW boiler can modulate down to 3.2 kW when heating demands are low, dramatically slashing cycling losses. Many modern catalogues focus on "Hybrid" setups, where