Mitsubishi Electric Ecodan R290 Monobloc (PUZ-WZ85YAA)

Specifications and technical data

Also known as: PUZ-WZ85YAA-BS, PUZ-WZ85YAA(-BS)

✓ BUS eligibleAir Source (ASHP)ResidentialR29018 kW

Manufacturer	Mitsubishi Electric
Model	Ecodan R290 Monobloc
Model code	PUZ-WZ85YAA
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	18 kW
Max heating output (low temp)	8.5 kW at A-7/W35
COP (heating)	2.6 at A-7/W35
SCOP (heating)	4.47 at W35
Operating range (air)	-25 to 46 °C
Heating flow temperature	up to 75 °C
Electrical supply	380-415V (Three Phase)
Dimensions (H×W×D)	1040 × 1050 × 480 mm
Operational Weight	117 kg
Sound power level	54 dB(A) (Sound Power LW(A))
Data added	2026-09-24
Data source	Manufacturer documentation (Mitsubishi Electric)
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.	037-0159-25-2
MCS certification	✓ MCS listed
MCS certificate no.	037-0159-25-2

Free data sheet (PDF) →

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

Mitsubishi Electric Ecodan R290 PUZ-WZ85YAA, 8.5 kW air-to-water monobloc with natural R290 refrigerant. 8.5 kW at A-7/W35 with a COP of 2.60, up to 12 kW at A7/W35; SCOP 4.47 at W35 (A+++) and 3.51 at W55 (A++). Flow to 75 C, operates down to -25 C. Sound power 54 dB(A). Three-phase.

Where to buy (UK)

UK Supplier	The Heat Pump Warehouse
UK Supplier	Secon Renewables
UK Supplier	City Plumbing
UK Supplier	BHL
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.