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CTC GSi 12
Model code: CTC GSi 12 (3 phase)
✓ BUS eligible✓ MCS listedGround Source (GSHP)ResidentialHeating only
Heating capacity
2.5–16 kW
SCOP
5.5
W35
COP
4.78
B0/W35
Sound power
39 dB(A)
Refrigerant
R407C
Boiler Upgrade Scheme
✓ BUS eligible
Listed on the Ofgem BUS Product Eligibility List (24 Sep 2026).
PEL certificate: MCS HP0023/68
Grant also needs an MCS-certified installer and a qualifying system design.
MCS certification
✓ MCS listed
Certificate: MCS HP0023/68
| General | |
|---|---|
| Heat pump type | Ground Source (GSHP) |
| Application | Residential |
| Refrigerant | R407C |
| Mode | Heating only |
| Heating performance | |
| Heating capacity | 2.5–16 kW |
| Max heating output (low temp) | 8.9 kW at B0/W55 |
| COP (heating) | 4.78 at B0/W35 |
| SCOP (heating) | 5.5 at W35 |
| Electrical, acoustic and physical | |
| Electrical supply | 380-415V (Three Phase) |
| Sound power level | 39 dB(A) (Sound Power LW(A)) |
| Dimensions (H×W×D) | 1910 × 596 × 673 mm |
| Operational Weight | 265 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.