QAHV CO2 Hot Water Heat Pump

As a leading manufacturer of air-to-water heat pumps, Mitsubishi Electric have developed QAHV; the latest innovation in their comprehensive line-up of Hot Water Heat Pump products. Specifically designed to produce high flow temperature up to 90°C, the QAHV Hot Water Heat Pump is suitable for commercial and industrial applications.

Utilising natural CO2 refrigerant, the QAHV provides one of the lowest environmental impacts when generating hot water. It is engineered to perform well in harsh conditions and climates, and of course being an inverter heat pump, it does so extremely efficiently. By adopting Mitsubishi Electric's unique technology, the QAHV ensures highly reliable performance as well as high heating capacity even at low outdoor temperatures.


Ecodan Pro


90°C Hot Water at
-25°C ambient temperature

Note: Above capacity ratings are all nominal rated.

Key Features

  • Rated Heating Capacity of 40kW
  • High efficiency (Achieved COP 3.88*)
  • Supplies high temperature hot water of up to 90°C
  • Operable even at low outdoor temperature of -25°C
  • Utilises natural CO2 refrigerant which has zero Ozone Depletion Potential (ODP) and has a Global Warming Potential (GWP) of 1
  • Uses a unique twisted and spiral gas cooler to enhance energy efficiency
  • 16 units can be grouped together to form a bank of 640kW rated heating capacity
  • Compact dimensions, minimising plant space

*Under normal heating conditions at outdoor temp: 16°CDB/12°CWB, inlet water temp 17°C, outlet water temp 65°C and the inlet water temperature 17°C

Stable Heating Capacities at Low Temperatures

As ambient temperatures drop, so too does the capacity of heat pumps. However, the QAHV is able to provide its full heating capacity of 40kW even at ambient temperatures as low as -3°C. Furthermore, the unit operates to supply 90°C hot water in ambient temperatures as low as -25°C.

This superior level of performance is achieved using Mitsubishi Electric’s industry-first Flash Injection Circuit which provides the optimum amount of refrigerant to the system via a compressor through a specially designed injection port. This ensures a highly stable operation that at the same time, meets the guidelines for Legionella.

Why is CO2 Refrigerant Used?

QAHV adopts CO2 (R744) as it is an environmentally-friendly, natural refrigerant which has zero Ozone Depletion Potential (ODP) and has a Global Warming Potential (GWP) of 1.

High Energy Saving Gas Cooler - Patented Technology

Unique to Mitsubishi Electric, QAHV utilises a twisted and spiral gas cooler. Using twisted pipes as water pipes and running the refrigerant pipes along their grooves helps to increase the heat-conductive area; allowing for better heat transfer and an impressive COP of 3.88*. The continuous spiral groove design accelerates the turbulence effect of water and helps to reduce pressure loss within the heat exchanger, enhancing efficiency. Equipped with the latest inverter scroll compressor, QAHV offers unparalleled efficiency when compared to fixed speed systems.

*Under normal heating conditions at outdoor temp: 16°CDB / 12°CWB, inlet water temp 17°C, outlet water temp 65°C.

Better Security of Hot Water Supply and More Lettable Space

As a single pass high temperature lift machine, QAHV works best with a high water temperature difference and delivers 10l/min or more of full temperature usable hot water in real time. This directly reduces the amount of storage required to meet the peak demands, and gives quicker recovery. Ideal for commercial uses where hot water demand is high, such as gyms, hotels, motels, aged care facilities and hospitals.

Optional Mitsubishi Electric “BS” Salt Corrosion Protection System Available

To help extend the life of the QAHV outdoor unit when located within highly corrosive environments, the optional Mitsubishi Electric “BS” Salt Corrosion Protection System can be applied during the outdoor units manufacturing process to ensure all components are 100% protected before the outdoor unit is assembled.

QAHV CO2 Hot Water Heat Pump