Heliotherm Whisper RS (Compact Air R290) (18.5 kW)
Specifications and technical data
✓ BUS eligibleAir Source (ASHP)ResidentialR29018.5 kW
| Manufacturer | Heliotherm |
|---|---|
| Model | Whisper RS (Compact Air R290) |
| Model code | SNT18L-M-R-CC |
| 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 | 18.5 kW |
| Max heating output (low temp) | 17.8 kW at A-10/W35 |
| Heating flow temperature | up to 72 °C |
| Electrical supply | 380-415V (Three Phase) |
| Dimensions (H×W×D) | 1702 × 935 × 1002 mm |
| Operational Weight | 246 kg |
| Sound power level | 49 dB(A) (Sound Power LW(A)) |
| Data added | 2026-10-20 |
| Data source | Heliotherm Highlights / Whisper brochure |
| 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. | BBA 0136/32 |
| MCS certification | ✓ MCS listed |
| MCS certificate no. | BBA 0136/32 |
Check noise at a neighbour’s window (MCS 020 a) →
Heliotherm Whisper RS SNT18L-M-R-CC R290 air-to-water heat pump, 18 kW nominal, flow up to 72 °C, integrated active cooling.
✎ Suggest a correction to this data
Data is compiled from manufacturer sources and may contain errors or gaps. Always confirm specifications with the manufacturer before making decisions.
Alternatives to consider
Three Air Source (ASHP) heat pumps from other manufacturers closest in capacity to this one.
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- Capacity
- 18.5 kW
- SCOP
- 4.84 (W35)
- Sound power
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inverTech iVT
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- Capacity
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- SCOP
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- Sound power
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- Price
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- SCOP
- 4.85 (W35)
- Sound power
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- Refrigerant
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