PWFY-P~BU Series

12.5kW Hot Water Module. Flexibility to create very large systems. Can be installed in conjunction with City Multi VRF air conditioning.



70°C Hot Water at
-20°C ambient temperature

Note: Above capacity ratings are all nominal rated.


  • Reliable, year-round water heating
  • Inverter driven for maximum energy efficiency
  • Water temperatures up to 70°C
  • Suitable for sanitary water heating when using secondary heat exchanger or solar ready coiled tank.
  • Operation at outdoor temperatures as low as -20°C
  • Environmentally friendly R410a and R134a refrigerants
  • Easy to use LCD Wall Controller with 7 Day Timer
  • Heat recovery from air conditioning system in cooling mode on R2 Systems
  • Modular design allows flexibility to create very large systems

CITY MULTI Hot Water Module

VRF Water Heating Units are the latest technological breakthrough from the Mitsubishi Electric City Multi Range, with the ability to heat water more efficiently than ever before. The PWFY-P~BU indoor modules can be installed in conjunction with standard City Multi VRF air conditioning indoor units, creating huge potential for heat recovery.

Available in one size: PWFY-P100VM-E-BU (12.5kW heating) which is modular to allow creation of larger solutions. Sanitary water heating has suitable applications in: hotels and motels, apartments, commercial kitchens and laundries, office buildings, food processing industry, heat recovery from air conditioning systems into sanitary water storage, and direct sanitary water heating is also possible.

The BU Series water heating unit is perfect for sanitary hot water, with excellent heat recovery possibilities. It houses a second compressor running on R134A refrigerant creating a cascade circuit between two plate heat exchangers. with the ability to sense flow or return water temperature with a dip-switch setting, these units can only be connected to City Multi R2 Series outdoor units. (The smallest stand alone VRF hot water system is therefore 25kW of heating). Heat recovery from air conditioning systems into sanitary water storage and direct sanitary water heating is also possible. Heat recovery technology taps into and utilises otherwise wasted heat energy, extracted from areas of a building that require cooling, providing heating for hot water. Recovering the heat in this manner maximises the efficiency of the system all year round, therefore increasing energy savings and substantially lowering running costs. Inputs: ON/OFF, Set Temp, Pump Interface. Outputs: ON/OFF, Error, Defrost.

BU Series Sanitary Hot Water (Booster Unit) for R2

CITY MULTI VRF Commercial Design

Mitsubishi Electric’s CITY MULTI Series has the flexibility to adapt efficiently to any building requirement. A wide line up of indoor units and simple piping systems enable an easy fit to even the most complex configurations. And both R2 and Y-Series systems can be simply operated through a central controller. With it’s flexible system architecture, easy operation and energy saving technology CITY MULTI offers an ideal blend of comfort, efficiency and economy. Please contact the Mitsubishi Electric City Multi representative in your area for a unique design solution.

PWFY-P~BU Series