WS is a heat pump with reversible water side, operating with R134a refrigerant, single or dual circuit unit from the inside with independent control of the single circuits, high efficiency twin-screw compressors with continuous modulation from 40% to 100% if equipped with a standard thermostatic valve, otherwise the modulation varies from 25% to 100% with electronic valve. The machine is hydraulic side reversible and equipped with plate type exchangers on the plant side and the source side. In the units with desuperheater or total recovery, it is possible to obtain free heat during the cooling function. Available in the standard or silenced version, with complete cowling and reduced noise emission, and your choice of a mechanical or electronic valve. The adjustment logic uses the “Always Working” function, which permits the continuity of the machine’s operation, even in critical conditions.