Warmflow Zeno AS03 R290

Specifications and technical data

✓ BUS eligibleAir Source (ASHP)ResidentialR2908–22 kW

Manufacturer	Warmflow
Model	Zeno AS03 R290
Model code	AS03-R290
Heat pump type	Air Source (ASHP) All Air Source heat pumps →
Application	Residential All Residential heat pumps →
Refrigerant	R290 All R290 heat pumps →
Mode	Heating only
Heating capacity	8–22 kW
Max heating output (low temp)	22 kW at A7/W35
COP (heating)	4.71 at A7/W35
SCOP (heating)	4.65 at W35
Operating range (air)	-25 to 43 °C
Heating flow temperature	20–75 °C
Electrical supply	220-240V (Single Phase)
Dimensions (H×W×D)	1330 × 1250 × 540 mm
Operational Weight	202 kg
Sound power level	64 dB(A) (Sound Power LW(A))
Price (unit only)	~£7,041.67 (checked 28/08/2026)
Data added	17/07/2026
Data source	Manufacturer Brochure (6664-ISSUE-K-WEB.pdf, pp.27-30)
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.	BSI KM 612798/11
MCS certification	✓ MCS listed
MCS certificate no.	BSI KM 612798/11
MCS listing	View on MCS ↗

Free data sheet (PDF) →

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

View manufacturer page →

Monobloc R290 air source heat pump, touchscreen control, Warmlink app remote control/diagnostics, built-in Grundfos high-efficiency circulation pump, qualifies for BUS/government grants in England, Scotland & Wales

Where to buy (UK)

UK Supplier	Plumbnation
UK Supplier	Inspired Heating
UK Supplier	Wolseley
UK Supplier	City Plumbing
UK Supplier	HVAC-Sanitary

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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.