The hybrid heat pump pairs an air-to-water heat pump with your existing gas or oil boiler. A smart controller automatically picks the most efficient source: the heat pump handles everyday needs (75–85% of heating hours), the boiler takes over in severe cold. Ideal for cutting carbon without changing everything.
The principle: the heat pump heats while it is efficient, the boiler tops up when needed.
The heat pump part reaches a seasonal efficiency comparable to a standard air-to-water unit. The controller optimises the switchover.
When the outdoor temperature drops below the bivalence point (~2–5 °C), the boiler takes over. The switchover is seamless.
The heat pump covers 75 to 85% of heating hours. Oil or gas is only used in severe cold: fossil fuel consumption falls by 50 to 70%.
The hybrid heat pump works with your existing radiators. No need for underfloor heating or to replace the emitters.
The outdoor unit connects to the existing circuit via a controller. No structural work, no boiler replacement (it stays in place).
Even during prolonged severe cold, the boiler ensures comfort. No risk of undersizing the heat pump.
* Indicative values. The bivalence point and the heat pump/boiler split depend on the insulation and the emitters.
Hybrid is a transition, not an endpoint. Here is when it stands out and when a full heat pump is a better fit.
It stands out when you want to cut carbon without turning everything upside down. Three common situations:
Your boiler is less than 10 years old and works well. Hybrid adds a heat pump without removing it: a sensible transition.
In a poorly insulated home, a full heat pump would be oversized. Hybrid adapts: the boiler compensates in severe cold.
For anyone who wants to cut fossil fuel without risking comfort. The boiler is reassuring.
If your home is well insulated or if the boiler is at the end of its life, the air-to-water heat pump on its own is often more cost-effective and eligible for better grants. We compare the two options during the survey.
The gas boiler was recent and in good condition. Rather than removing it, we connected an air-to-water heat pump in hybrid mode. The result: the heat pump handles 80% of the heating, the boiler only runs 30 days a winter. Gas consumption divided by three.
5.0/5 · 3verified reviews
« Châssis, panneaux et pompe à chaleur en une seule fois : on a eu un seul devis, un seul planning et zéro paperasse pour les primes. Le résultat est impeccable et notre facture d'énergie a chuté. On ne pensait pas que ce serait aussi simple. »
« Passage du mazout à une pompe à chaleur air-eau. Chantier propre, anciens radiateurs conservés. La maison est mieux chauffée pour bien moins cher. »
« PAC air-air réversible installée avant l'été. Confort été comme hiver, et le SAV répond vite. Très satisfait du suivi. »
Three strategies for your heating. Hybrid is the compromise.
| Critère | Hybrid heat pumpVous êtes ici | Full air-to-waterVoir la gamme → | Boiler aloneVoir la gamme → |
|---|---|---|---|
| Fossil fuel reduction | 50–70% | 100% | 0% |
| Severe-cold security | Boiler takes over | Electric backup | Boiler |
| Investment | Mid-range | Higher | €0 (existing) |
| Existing radiators | Compatible | To be checked | Compatible |
| Grants | Supported | The highest | None |
| Maintenance | Heat pump + boiler | Heat pump alone | Boiler alone |
| Best for | Transition, recent boiler | Full decarbonisation | Status quo (not recommended) |
The complete replacement of the boiler. Better grants, full decarbonisation.
Compare with full air-to-water →As a supplement for a specific room or summer cooling.
See air-to-air →The best efficiency, if the land and budget allow.
Discover geothermal →Hybrid also works with underfloor heating for optimal comfort.
See underfloor heating →Installed hybrid price ranges and 2026 regional grants.
See the prices →An overview of our heat pump solutions in Belgium.
Back to the heat pump guide →The cost is lower than a full air-to-water unit because the boiler and the emitters stay in place.
See heat pump prices & grants in detail →* Indicative ranges for installed equipment. The fossil-fuel saving depends on the insulation and the bivalence point.
Yes, that is the whole point. The heat pump connects to the existing circuit via a smart controller. The boiler stays your safety net in severe cold.
Generally a 50 to 70% reduction. The heat pump covers 75 to 85% of heating hours. Fossil fuel is only used during periods of prolonged severe cold.
Most recent gas or oil boilers are compatible. We check during the survey: the hybrid controller adapts to most brands.
You will have a choice: replace it with a new one to stay hybrid, or switch to a full air-to-water heat pump. By then, your home may be better insulated and the full heat pump will be enough.
Yes. Adding a heat pump qualifies for regional grants (Wallonia, Brussels) and the 6% VAT in renovation. The amounts are sometimes lower than for a complete replacement.
That is precisely where it excels. In a poorly insulated home, a full heat pump would be oversized and less efficient. Hybrid adapts: the heat pump handles everyday needs, the boiler covers the peaks.
Free technical survey, boiler compatibility checked, grants calculated. Describe your project in under a minute.