Riello NXHM 004

Specifications and technical data

✓ BUS eligibleAir Source (ASHP)ResidentialR322.31–4.4 kW

Manufacturer	Riello
Model	NXHM 004
Model code	NXHM 004
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	2.31–4.4 kW
Max heating output (low temp)	4.4 kW at A7/W55
COP (heating)	5.1 at A7/W35
SCOP (heating)	4.85 at W35
Heating flow temperature	up to 65 °C
Power input	2.3 kW
Electrical supply	220-240V (Single Phase)
Cooling capacity	4.7 kW
Max cooling output (high temp)	4.5 kW at A35/W7
Cooling flow temperature	7–18 °C
EER (cooling)	3.45 at A35/W7
SEER (cooling)	4.99 at W7
Operational Weight	86 kg
Sound power level	55 dB(A) (Sound Power LW(A))
Price (unit only)	~£2,662 (checked 2026-07-07)
Data added	2026-07-06
Data source	Manufacturer Data Sheet
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.	MCS HP0291/01
MCS certification	✓ MCS listed
MCS certificate no.	MCS HP0291/01
MCS listing	View on MCS ↗
Real-world performance data	View on HeatpumpMonitor.org ↗

Free data sheet (PDF) →

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

View manufacturer page →

Riello NXHM 004 is a 4.2 kW air source heat pump, providing heating and cooling, using R32 refrigerant.

Where to buy (UK)

UK Supplier	Midsummer Wholesale
UK Supplier	UK Renewable Supplies
UK Supplier	Eco Wizard
UK Supplier	Quality Heating

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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.