Hitachi airH2O 400 12kW (400V)

Specifications and technical data

Air Source (ASHP)ResidentialR323.77–14.5 kW

Manufacturer	Hitachi
Model	airH2O 400 12kW (400V)
Model code	HZKF12KSO-Q
Heat pump type	Air Source (ASHP)
Application	Residential
Refrigerant	R32
Mode	Heating & cooling
Heating capacity	3.77–14.5 kW
Max heating output (low temp)	8.5 kW at A-7/W55
COP (heating)	4.95 at A7/W35
Operating range (air)	-25 to 35 °C
Heating flow temperature	20–65 °C
Electrical supply	380-415V (Three Phase)
Cooling capacity	11 kW
Max cooling output (high temp)	10 kW at A35/W7
EER (cooling)	4.1 at A35/W7
Operational Weight	49.5 kg
Sound power level	64 dB(A) (Sound Power LW(A))
Data added	2026-06-27
Data source	Manufacturer Data Sheet

View manufacturer page →

Hitachi airH2O 400 12kW (400V) is a 12 kW air source heat pump, providing heating and cooling, using R32 refrigerant.

Where to buy (UK)

UK Supplier	The Heat Pump Warehouse
UK Supplier	Secon Renewables

✓ Manually verified by Heat Pump Database

✎ Suggest a correction to this data

Data is compiled from manufacturer sources and may contain errors or gaps. Always confirm specifications with the manufacturer before making decisions.

Reviews & further reading

Review Hitachi Heat Pump Review 2026: Costs, Features, & Models — Future Heat Ltd
Covers the Hitachi Yutaki and airH2O ranges generally, not this specific model only.