SolaX R290 Series (STU3-C16R290)

Specifications and technical data

Also known as: Indoor unit STN1-C01 and outdoor unit STU3-C16R290, Indoor unit STN3-C02(9) and outdoor unit STU3-C16R290, Indoor unit STN3-C03(9W3) and outdoor unit STU3-C16R290

✓ BUS eligibleAir Source (ASHP)ResidentialR29015.5 kW

Manufacturer	SolaX
Model	R290 Series
Model code	STU3-C16R290
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 & cooling
Heating capacity	15.5 kW
Max heating output (low temp)	13 kW at A-7/W35
COP (heating)	4.55 at A7/W35
SCOP (heating)	4.9 at W35
Operating range (air)	-25 to 35 °C
Heating flow temperature	25–80 °C
Electrical supply	380-415V (Three Phase)
Cooling capacity	15.5 kW
Max cooling output (high temp)	14 kW at A35/W7
Cooling flow temperature	5–25 °C
EER (cooling)	2.75 at A35/W7
Dimensions (H×W×D)	1050 × 1310 × 465 mm
Operational Weight	165 kg
Sound power level	52 dB(A) (Sound Power LW(A))
Data added	2026-08-30
Data source	Manufacturer datasheet
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.	011-1W1111_06
MCS certification	✓ MCS listed
MCS certificate no.	011-1W1111_06

Free data sheet (PDF) →

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

View manufacturer page →

SolaX Thermal R290 STU3-C16R290 outdoor unit, 15.5 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.

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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.