Mitsubishi Electric has developed the ATW reversible air-water heat pump hydronic module specifically for hydronic heating and air conditioning systems. The refrigeration side of the module may be connected to VRF CITY MULTI SMALL Y and Y Series outdoor heat pump units, or to R2 heat recovery units. 


The hydronic side of the module may feed heated underfloor systems or other similar utilities, to provide heating in winter in heat pump mode, or cooling in summer in conditioning mode. Connecting these modules to R2 Series VRF CITY MULTI heat recovery outdoor units offers extraordinarily levels of efficiency, especially in spring and autumn, with extremely high COP values. The HWS hydronic module can produce hot water at temperatures up to 40°C in the return line (45°C in delivery line), with a heating capacity of up to 12.5 kW per module which, however, is scalable in relation to internal demand.

Main Features:

The functional characteristics of the ATW hydronic module cater for the needs of a very wide variety of different installations:

  • Nominal heating capacity: 12.5 kW;
  • Nominal cooling capacity: 11.2 kW;
  • Outdoor operating temperature range, heating mode: -20°C to +32°C (R2
  • Heat recovery series); -20 to +15.5°C (Y heat pump series);
  • Outdoor operating temperature range, conditioning mode: -5°C to +46°C (R2 and Y series);
  • Return hot water temperature range: 10°C to 40°C;
  • Mains power: single-phase, 230V AC;
  • Individual thermal energy consumption billing with field devices.

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