Air-to-water heat pump price in Belgium in 2026
The air-to-water heat pump is the most widely installed technology when replacing a boiler: it heats, produces domestic hot water and benefits from the best regional grants. This guide details the ranges by power and configuration (monobloc, split, integrated DHW) so your quote no longer has any grey areas.
Indicative ranges incl. VAT, grants not deducted.
Air-to-water heat pump price by configuration and power
Ranges for an air-to-water heat pump supplied and installed, hydraulic and electrical connection included. Excludes adapting the existing heating network and a separate DHW tank unless stated.
| Configuration | Low power 6 kW · apt. / compact house | Medium power 10 kW · 3-sided house | High power 14 kW+ · 4-sided house |
|---|---|---|---|
| MonoblocSingle unit, simplified installation | 8 000 – 10 500 € | 10 500 – 13 000 € | 13 000 – 15 500 € |
| SplitOutdoor unit + indoor unit | 9 000 – 11 000 € | 11 000 – 13 500 € | 13 500 – 16 000 € |
| With integrated DHW200 L tank included | 10 000 – 12 000 € | 12 000 – 14 500 € | 14 500 – 16 000 € |
Indicative prices incl. VAT, supply and installation included, grants not deducted. The exact sizing is established during the free quote. Learn more about the air-to-water heat pump or compare with the all-technologies heat pump prices.
What makes the price of your air-to-water heat pump vary
For the same power, two air-to-water quotes can differ by several thousand euros. Here are the line items that really weigh on the final bill.
- Power in kW
The power is sized on the heat losses of your home (m², insulation, exposure). A poorly insulated house needs more kW, which directly increases the cost of the outdoor unit.
- Monobloc or split configuration
The monobloc groups all the components in a single outdoor unit — faster and cheaper to install. The split separates outdoor and indoor units, offering more placement flexibility but a longer installation.
- Integrated or separate DHW tank
A domestic hot water tank of 200 to 300 litres adds 1 000 to 2 500 € depending on the capacity and the brand. Some models integrate it directly (DHW monobloc); others require a separate tank.
Air-to-water heat pump guide → - Existing heating network
Low-temperature radiators, underfloor heating or fan coils: adapting the existing network can add 2 000 to 5 000 € to the bill. A preliminary heat assessment identifies the necessary work.
How a heat pump works → - Brand (Daikin, Atlantic, Vaillant…)
Premium brands (Daikin Altherma, Vaillant aroTHERM, Atlantic Alfea) command prices 15 to 25 % higher than entry-level ranges, but offer better warranties (5 to 10 years) and a higher COP.
See heat pump brands → - Electrical connection
Meter capacity, dedicated sub-panel and suitable residual-current protection: an often-underestimated item, which can represent 400 to 900 € depending on the existing installation.
The grants that lower the price of your air-to-water heat pump
In Belgium, replacing a fossil-fuel boiler with an air-to-water heat pump qualifies for substantial regional grants and the reduced 6 % VAT. Here are the 2026 benchmarks — we calculate the amount and build the file for you.
Prime Habitation
Grant for replacing oil or gas heating with a high-performance air-to-water heat pump, scaled according to the household income.
- Replacement of a fossil-fuel generator (oil, gas, coal)
- Heat pump with a COP ≥ 3.5 (A++ label or higher)
- Prior home audit for the highest amounts
- Increased amount for low-income households
Renolution grants
Support for installing a high-performance heat pump with three income categories and a bonus for less efficient homes.
- Heat pump for heating or domestic hot water production
- Home over 10 years old
- Certified heat pump installer and itemised invoice provided
- Combinable with other Renolution grants (insulation, glazing)
Get your price net of grants, in 48 h
We check your entitlements, cost it net of grant and build the file: you advance nothing beyond your remaining balance.
- We check your entitlements
Region, income, current heating type, age of the home: we identify every claimable grant before even costing it.
- We size and we cost it
Simplified heat assessment, choice of the suitable air-to-water configuration, detailed line-by-line quote, net of grant.
- We build the file
Regional forms, technical annexes, certificate of decommissioning of the fossil-fuel heating: we handle everything.
- We deduct where possible
When the mechanism allows it, the grant is subtracted from your final bill. No cash advance.
Are you in Flanders? The Mijn VerbouwPremie also covers the installation of an air-to-water heat pump — ask us for the details for your municipality.
A range in 10 seconds
Choose a configuration to get a ballpark figure. The free quote remains the only accurate estimate tailored to your home.
Indicative estimate, excluding adaptation of the existing heating network (radiators, underfloor heating).
Replacing an oil boiler with a split air-to-water heat pump
A concrete renovation case to make every cost item meaningful. Your project will be costed according to your precise needs.
Indicative example dated 2026, excluding adaptation of the existing radiators. Request your quote for pricing tailored to your home.
Dig deeper before deciding
- Air-to-water heat pump Complete guide
Everything about air-to-water technology: operation, COP, sizing and maintenance, all on the pillar page.
See the complete guide → - All-technologies heat pump prices Comparison
Compare air-to-air, air-to-water and geothermal on a level playing field to choose the technology that fits your home.
See heat pump prices → - Heat pump grants Wallonia Subsidies 2026
The full breakdown of grants available in Wallonia for an air-to-water heat pump replacing fossil-fuel heating.
Explore the subsidies →
Your questions about the price of an air-to-water heat pump
How much does an air-to-water heat pump cost in 2026?
For a medium-power air-to-water heat pump (10 kW) supplied and installed, expect between 10 500 and 13 500 € in Belgium, hot water tank included. The regional grants (up to 4 000 € in Wallonia and 4 500 € in Brussels) significantly reduce the remaining balance.
What is the price difference between a monobloc and a split?
A monobloc air-to-water unit generally costs 1 000 to 2 000 € less to install than a split of the same power, because it requires less installation time. On the other hand, the split offers better placement flexibility and can be quieter indoors.
Is the DHW tank included in the displayed price?
It depends on the configuration. The "Monobloc" and "Split" ranges do not include a separate DHW tank (to be added: 1 000–2 500 €). The "With integrated DHW" ranges include a 200 L tank. Each quote details this item precisely.
Do you have to replace the radiators to switch to an air-to-water heat pump?
Not systematically. A modern air-to-water heat pump can reach up to 55 °C, which suits correctly sized radiators. If your radiators are too small, a partial replacement (1 000–4 000 €) may be necessary. A preliminary heat assessment identifies it.
What grants are there for an air-to-water heat pump in Belgium in 2026?
In Wallonia, the Prime Habitation can reach 4 000 € for an air-to-water heat pump replacing fossil-fuel heating. In Brussels, the Renolution grant rises to 4 500 €. In both cases, the amount depends on your income and the type of heating replaced.
Is the VAT reduced for an air-to-water heat pump?
Yes. When renovating a home over 10 years old, the VAT is 6 % instead of 21 %. That is a significant saving on a budget of 8 000 to 16 000 €. We check your eligibility from the first contact and apply it directly on the quote.
Your exact price, costed and net of grants
The ranges give the ballpark — the quote gives the figure. Heat assessment, sizing and grants calculated and deducted, a single point of contact. In under a minute.
- Free and no obligation
- Grants & 6% VAT calculated and deducted
- Costed quote within 48 working hours