Heat pump prices in Belgium in 2026: air-to-water and geothermal

Replacing an old boiler with a heat pump has become the flagship energy project for Belgian households. It is also one of the hardest investments to price without a quote: between a well-insulated terraced house and a villa that needs a geothermal borehole, the budget changes completely. Here are the brackets charged in Belgium in 2026, what explains them, and the grants that can seriously lighten the invoice.

Rates in 2026

• Air-to-water heat pump, installed: €8,000 to €15,000.
• Geothermal heat pump, installed: €15,000 to €25,000.

The air-to-water unit draws heat from the outside air to feed your central heating and, depending on the model, your domestic hot water. It is the most common choice in renovation, as it can be installed without major outdoor works.

Geothermal systems draw heat from the ground through a borehole or buried collectors. The borehole explains the price gap: it is a project in itself. In return, the heat source stays stable all year round, even in the depths of winter.

What makes the price vary

• The power required. It depends on the volume to heat and above all on the quality of the insulation. A well-insulated house needs a smaller machine, so a cheaper one.
• The existing emitters. A heat pump performs best with underfloor heating or low-temperature radiators. If your current radiators are undersized for that regime, replacing them adds to the budget.
• Domestic hot water. Integrated with a dedicated tank or handled separately: the choice weighs on the quote.
• Hydraulic complexity. Connecting to the existing circuit, removing the old boiler, adapting the utility room: every configuration is different.
• The plot, for geothermal. Soil type, access for the drilling rig, available space: all factors that position the borehole within the bracket.
• Brand and noise level. The quietest outdoor units and premium ranges cost more, but acoustic comfort matters, for you and for your neighbours.

Worked examples

Three scenarios built solely with the brackets and grants mentioned:

• Renovating a well-insulated house with an air-to-water unit: expect €8,000 to €15,000 installed, depending on the power and whether hot water is integrated.
• A geothermal project with a borehole: expect €15,000 to €25,000 installed, depending on the plot and configuration.
• In Brussels, with the maximum Renolution grant: an air-to-water unit comes to €3,500 to €10,500 after deducting the €4,500 grant, and a geothermal system to €9,000 to €19,000 after deducting the €6,000.

The after-grant amounts assume you obtain the ceiling, which depends on your situation. The quote itself must always show the full price.

VAT at 6% or 21% and grants

On VAT, the general rule applies: works carried out by a contractor in a private dwelling over 10 years old qualify for the reduced 6% rate instead of 21%. On an installation of this size, the difference adds up quickly.

On grants, each region has its own channel:

• In Brussels, the Renolution grant reaches up to €4,500 for an air-to-water heat pump and up to €6,000 for geothermal, under the scheme's conditions. Applications go through the Renolution portal.
• In Wallonia, the Walloon grants support heat pump installations, with amounts linked to income category and technical requirements.
• In Flanders, Mijn VerbouwPremie covers heat pumps, again with amounts that vary with the applicant's profile.

In all three regions, installation by a contractor and compliance with technical criteria condition the grant. Check your eligibility before signing.

Mistakes to avoid

• Installing without a sizing study. An oversized machine cycles on and off and wears out, an undersized one leans on the electric back-up. Demand a heat loss calculation, not a guess.
• Equipping a poorly insulated home. In a draughty house, even the best heat pump will consume too much. Insulate first, size second: the order of works matters.
• Comparing quotes with different scopes. Hot water tank, back-up, emitter adaptation, commissioning, maintenance: check that every line exists in both quotes before comparing totals.
• Neglecting the outdoor unit's location. Noise perceived next door, distance from windows, local planning rules: a badly chosen spot is paid for in disputes or costly relocations.
• Forgetting maintenance. Like a boiler, a heat pump needs servicing. Clarify from the quote stage what the installer covers after commissioning.

FAQ

Does a heat pump suit an existing house?

Yes, provided the insulation keeps up and the emitters are compatible with a low-temperature regime. Air-to-water is the most common choice in renovation. If your home is poorly insulated, treat the envelope first, then size the machine for the improved house.

Which grants apply in your region?

In Brussels, the Renolution grant goes up to €4,500 for air-to-water and €6,000 for geothermal. In Wallonia, go through the Walloon grants, and in Flanders through Mijn VerbouwPremie: amounts there depend on your income and the scheme's technical requirements.

Which VAT rate applies to a heat pump?

The reduced 6% rate applies if the installation is carried out by a contractor in a private dwelling over 10 years old. In other cases, notably new builds, the 21% rate applies.

Compare quotes before you sign

Between the power required, the state of your emitters and your region's grants, only a detailed quote can place your project within the bracket. Post your project on Batizzy to compare quotes from verified installers. If you are still weighing up the technology, read our comparison of heat pumps versus condensing boilers, and to pay the right rate, our guide to 6% VAT in Belgium.