Hitachi airH2O 600 (Yutaki S) (RAS-4WHRP2E)

Specifications and technical data

✓ BUS eligibleAir Source (ASHP)ResidentialR323.7–12 kW

Manufacturer	Hitachi
Model	airH2O 600 (Yutaki S)
Model code	RAS-4WHRP2E
Heat pump type	Air Source (ASHP) All Air Source heat pumps →
Application	Residential All Residential heat pumps →
Refrigerant	R32 All R32 heat pumps →
Mode	Heating & cooling
Heating capacity	3.7–12 kW
Max heating output (low temp)	10.5 kW at A-7/W35
COP (heating)	4.6 at A7/W35
SCOP (heating)	4.49 at W35
Operating range (air)	-25 to 25 °C
Electrical supply	380-415V (Three Phase)
Cooling capacity	9 kW
Max cooling output (high temp)	10.5 kW at A35/W7
EER (cooling)	3.05 at A35/W7
Dimensions (H×W×D)	1140 × 1220 × 430 mm
Operational Weight	112 kg
Sound power level	62 dB(A) (Sound Power LW(A))
Data added	2026-09-23
Data source	Manufacturer documentation (Hitachi)
Verification	Verified by a human
Boiler Upgrade Scheme	✓ BUS eligible — Listed on the Ofgem BUS Product Eligibility List (24 Sep 2026). Grant also needs an MCS-certified installer and a qualifying system design. Funding guide
PEL certificate no.	041-K002-73 b

Free data sheet (PDF) →

Check noise at a neighbour’s window (MCS 020 a) →

Hitachi airH2O 600 outdoor unit RAS-4WHRP2E, the 4 HP R32 split air-to-water heat pump (Yutaki S range), rotary DC inverter compressor. 10 kW at A7/W35 with a COP of 4.6 when paired with its matching indoor unit, modulating from 3.7 to 12 kW. SCOP 4.49 at W35. Cooling available with the cooling kit. Three-phase supply.

Where to buy (UK)

UK Supplier	The Heat Pump Warehouse
UK Supplier	Secon Renewables

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