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Heliotherm Whisper RS (Compact Air R290)
Model code: SNT18L-M-R-CC
✓ BUS eligible✓ MCS listedAir Source (ASHP)ResidentialHeating & cooling
Heating capacity
18.5 kW
Max flow temp
72°C
Sound power
49 dB(A)
Refrigerant
R290
Boiler Upgrade Scheme
✓ BUS eligible
Listed on the Ofgem BUS Product Eligibility List (24 Sep 2026).
PEL certificate: BBA 0136/32
Grant also needs an MCS-certified installer and a qualifying system design.
MCS certification
✓ MCS listed
Certificate: BBA 0136/32
| General | |
|---|---|
| Heat pump type | Air Source (ASHP) |
| Application | Residential |
| Refrigerant | R290 |
| Mode | Heating & cooling |
| Heating performance | |
| Heating capacity | 18.5 kW |
| Max heating output (low temp) | 17.8 kW at A-10/W35 |
| Heating flow temperature | up to 72 °C |
| Electrical, acoustic and physical | |
| Electrical supply | 380-415V (Three Phase) |
| Sound power level | 49 dB(A) (Sound Power LW(A)) |
| Dimensions (H×W×D) | 1702 × 935 × 1002 mm |
| Operational Weight | 246 kg |