A.O. Smith WWHB 40
The A.O. Smith WWHB 40 is a heat pump with SCOP (35 °C) 5.6 and refrigerant R134A.1,2
Key figures
Rules in Malta
Water Heater Scheme (heat pump water heaters)
UnknownREWS runs a national grant scheme for energy-efficient water heaters in homes; heat pump water heaters are eligible (alongside solar water heaters). The scheme has been extended to 31 December 2026, and part A of the application must be submitted before you buy and install the equipment. Grant amounts: see the REWS page (not verified by us).
Technical specifications
| General | |
|---|---|
| Type (source) | Water-to-water1 |
| Performance | |
| Rated output 35 °C | 43 kW2 |
| Rated output 55 °C | 39 kW2 |
| Efficiency | |
| SCOP (35 °C) | 5.62 |
| SCOP (55 °C) | 4.452 |
| Seasonal efficiency ηs 35 °C | 221 %2 |
| Seasonal efficiency ηs 55 °C | 175 %2 |
| Energy label 35 °C | A+++2 |
| Energy label 55 °C | A+++2 |
| Noise | |
| Indoor unit sound power | 65 dB(A)2 |
| Refrigerant | |
| Refrigerant | R134A1 |
| Refrigerant GWP | 1,4301 |
| Grants & market | |
| ISDE grant (NL) | 8,775 €1 |
How it ranks
SCOP (35 °C): better than 20% of comparable models in our database (Heat pumps · Water-to-water · ≥ 14 kW; n = 65).
Rank 52 of 66
Compared with every model on VersusIndex in the same group with a known value; equal values do not count as better. This says nothing about price, installation or reliability.
Similar models
Other brands, same type and a comparable size.
More from A.O. Smith
- A.O. Smith WWHB 20 SCOP (35 °C): 5.68
How we collect and check this data →
Frequently asked questions
Sources
- ISDE heat pump notification code list — Rijksdienst voor Ondernemend Nederland (RVO) · accessed 28 Sept 2026
- European Product Registry for Energy Labelling (EPREL) – heat pumps — Europese Commissie · accessed 18 Oct 2026
- Water Heater Scheme (heat pump water heaters) — Regulator for Energy and Water Services (REWS)