Heat pump can provide hot water at up to 90°C

MHI, heat pump, DHW

MHI’s Q-Ton air-to-water heat pump uses CO2 as the refrigerant and can heat sanitary hot water at up to 90°C. These 30 kW units can achieve a COP of 4.3 with water on/off at 12/65°C and ambient air at 16°C, falling to 4.2 with water on/off of 5/65°C and ambient of 7°C. With an ambient of -25°C, the COP is still close to 2.

Q-Ton heat pumps have a 2-stage combined scroll-rotary compressor. Up to 16 units can be connected in a modular configuration to give 480 kW and connected to 4000 l of hot-water storage. Central control is provided by MHI’s Superlink II communications network and BMS interface if required.

Running costs are said to be 58% lower than a gas-fired boiler, and there is no need to top up with gas or electric appliances.

For more information on this story, click here:  April 2012, 162
Related links:
Related articles:



modbs tv logo

Commercial landlords face MEES compliance crunch

Two-thirds of UK commercial real estate (CRE) owners admit they are “not fully compliant” with energy efficiency regulations, according to new research from smart buildings specialist LMG. 

Recognising outstanding achievements at CIBSE Building Performance Awards 2025

The Park Plaza Westminster Bridge in London came alive on 27th February 2025 for the prestigious CIBSE Building Performance Awards.