2-Pipe ECOi with Water Heat Exchanger

The Panasonic solution for chilled and hot water production!

For hydronic applications.
Water Heat Exchanger (WHE) for ECOi. Operation and control by timer remote control CZ-RTC4. Energy-efficient capacity control. Stainless steel plate heat exchanger with anti-freeze protection control. Change-over between heating and cooling operation.

  • A class water pump included
  • 4 Way valve included
  • Heating, cooling and DHW
  • Increased energy efficiency and low CO2 emisions
  • Water connections R2”f for 28kW and R2,5”f for 50kW
  • Maximum distance between outdoor unit and WHE: 170m
  • Maximum hot water outlet temperature: 45°C
  • Minimum chilled water outlet temperature: 5°C
  • Outdoor temperature range in cooling mode: +5°C to +43°C
  • Outdoor temperature range in heating mode: -11°C to +15°C (with low temperature kit -25°C)


  • 25 kW: PAW-250W5G (Hydrokit without pump) (Heating and Cooling)
  • 25 kW: PAW-250WP5G (Hydrokit with A class water pump) (Heating and Cooling)
  • 50 kW: PAW-500WP5G (Hydrokit with A class water pump) (Heating and Cooling)
  • 50 kW: PAW-500W5G (Hydrokit without pump) (Heating and Cooling)

You can find information and precautions relevant for installation and maintenance in the instruction manuals. You can find information relevant for disposal at end-of-life in the instruction manual.