heatpumpdatabaseProduct data sheetheatpumpdatabase.com
Vaillant aroTHERM Split
Model code: aroTHERM split 12kW VWL 125/5 AS 230V S2 + VWL 127/5 IS
✓ BUS eligible✓ MCS listedAir Source (ASHP)ResidentialHeating only
Heating capacity
15.9 kW
SCOP
4.56
W35
COP
4.6
A7/W35
Max flow temp
55°C
Sound power
60 dB(A)
Refrigerant
R410A
Boiler Upgrade Scheme
✓ BUS eligible
Listed on the Ofgem BUS Product Eligibility List (24 Sep 2026).
PEL certificate: KIWA 00016/017 HP
Grant also needs an MCS-certified installer and a qualifying system design.
MCS certification
✓ MCS listed
Certificate: KIWA 00016/017 HP
| General | |
|---|---|
| Heat pump type | Air Source (ASHP) |
| Application | Residential |
| Refrigerant | R410A |
| Mode | Heating only |
| Heating performance | |
| Heating capacity | 15.9 kW |
| Max heating output (low temp) | 12.5 kW at A-5/W35 |
| COP (heating) | 4.6 at A7/W35 |
| SCOP (heating) | 4.56 at W35 |
| Heating flow temperature | up to 55 °C |
| Electrical, acoustic and physical | |
| Electrical supply | 220-240V (Single Phase) |
| Sound power level | 60 dB(A) (Sound Power LW(A)) |
| Dimensions (H×W×D) | 1480 × 1100 × 450 mm |
| Operational Weight | 169 kg |
Test conditions: A = outdoor air °C, W = flow water °C (e.g. A7/W35 = 7°C air, 35°C flow). Compare COP and SCOP only at the same conditions.