SolaX R290 Series (8.5 kW)

Specifications and technical data

Also known as: Indoor unit STN1-C01 and outdoor unit STU3-C08R290, Indoor unit STN3-C02(9) and outdoor unit STU3-C08R290, Indoor unit STN3-C03(9W3) and outdoor unit STU3-C08R290

Air Source (ASHP)ResidentialR2908.5 kW

Manufacturer	SolaX
Model	R290 Series
Model code	STU3-C08R290
Heat pump type	Air Source (ASHP)
Application	Residential
Refrigerant	R290
Mode	Heating & cooling
Heating capacity	8.5 kW
Max heating output (low temp)	7 kW at A-7/W35
COP (heating)	5.15 at A7/W35
SCOP (heating)	5.44 at W35
Operating range (air)	-25 to 35 °C
Heating flow temperature	25–80 °C
Electrical supply	380-415V (Three Phase)
Cooling capacity	8.5 kW
Max cooling output (high temp)	8 kW at A35/W7
Cooling flow temperature	5–25 °C
EER (cooling)	3.4 at A35/W7
Dimensions (H×W×D)	1050 × 1310 × 465 mm
Operational Weight	151 kg
Sound power level	49 dB(A) (Sound Power LW(A))
Data added	2026-08-30
Data source	Manufacturer datasheet
MCS certification	✓ MCS listed — eligible for Boiler Upgrade Scheme (MCS-certified install required)
MCS certificate no.	011-1W1110_03

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SolaX Thermal R290 STU3-C08R290 outdoor unit, 8.5 kW at A7/W35, R290 refrigerant. Split system paired with an STN-series indoor control, hydraulic or hydraulic-integrated unit. Maximum flow temperature 80 C, operation to -25 C.

✓ Manually verified by Heat Pump Database

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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.