Heat pumps in Belgium (2026): 6% VAT, COP rules and when they pay off

A heat pump in Belgium in 2026 is more attractive than it has been in years — but only if you get three things right: the VAT, the efficiency rules, and the emitters it runs on. The federal government has locked in a reduced 6% VAT on heat pumps for 2026–2030, while fossil-fuel boilers have moved to 21%. Flanders and Wallonia each set their own minimum efficiency for a premium. And the device only delivers its promised running cost — and its big EPC-label gain — when it heats water at a low temperature.

This guide explains the 6% VAT, the COP thresholds region by region, why a heat pump beats a gas boiler on the EPC label, what the systems cost on the 2026 Belgian market, and when the switch actually pays off.

Key facts

• 6% VAT on heat pumps, 2026–2030. A federal measure extended for five years from 1 January 2026, applying even to homes under 10 years old. Hybrids that include a gas boiler are excluded.
• Fossil boilers now 21% VAT. Gas and oil boilers lost the 6% rate on 29 July 2025; from 1 July 2026 no reduced VAT applies to gas boilers in renovations.
• Efficiency thresholds differ by region. Flanders: COP ≥ 4 (EN 14511, A7/W35) plus EU label A+ (A++ for geothermal), flow temperature ≤ 55 °C. Wallonia: COP ≥ 3.5 — and air-to-air heat pumps are excluded.
• A heat pump wins on the label. Electricity counts at a primary-energy factor of 2.5, gas at about 1, but a heat pump delivers 3–4 units of heat per unit of electricity, so it still beats a condensing gas boiler in the EPC score.
• Low-temperature emitters are decisive. Seasonal efficiency rises sharply as flow temperature falls: roughly SCOP 2.8 on 55 °C radiators versus 4.2 on 35 °C underfloor heating.

The 6% VAT — and the 21% trap on gas

The headline is simple. From 1 January 2026, the federal reduced 6% VAT on the supply and installation of heat pumps is extended for five years, to the end of 2030. Unusually, it applies even to dwellings under 10 years old, and it replaces the old green-loan interest deduction, which has been abolished (never count on that deduction again).

The mirror image is the penalty on fossil heating. Since 29 July 2025, gas and oil boilers carry 21% VAT on supply and installation, and from 1 July 2026 no reduced rate applies to gas boilers in renovation at all. On a €4,000 boiler, that VAT swing alone is worth several hundred euros — before you count the heat pump's premiums and lower running cost. One caveat: a hybrid (gas boiler plus heat pump) does not get the 6% rate, because it includes a gas boiler.

COP rules: what qualifies for a premium

"COP" is the coefficient of performance — how many units of heat the pump delivers per unit of electricity. Each region sets its own bar, and the detail matters because missing it means no premium.

• Flanders. An air-water heat pump as sole central heating needs COP ≥ 4 (measured to EN 14511 at A7/W35) and EU product label A+ (A++ for geothermal), with a flow temperature ≤ 55 °C and a RESCert-certified installer. The 2026 premium runs from €6,000 for the lowest-income category down to €1,500 for the highest brackets (from 1 March 2026), and stays available until 31 December 2027.
• Wallonia. The heat pump must reach COP ≥ 3.5 (EN 14511, A7/W35), or the equivalent SCOPon thresholds of 3.2 at 35 °C and 2.825 at 55 °C for air-water units. Crucially, air-to-air heat pumps are excluded. The premium is a base of €600 multiplied by your income category, up to €3,600 (category R1), and an installer audit is required. From 1 January 2026, a RESCert installer is mandatory.

Air-to-air units (reversible split systems) are the cheapest heat pumps, but they are excluded from the Walloon premium and earn only €300 in Flanders under strict conditions. For whole-home heating, an air-water or geothermal system is the route that the subsidies and the EPC label reward.

Why a heat pump wins on the EPC label

This is the part many homeowners miss. The EPC/PEB score is expressed in primary energy per square metre. Electricity is multiplied by a primary-energy factor of 2.5; gas counts at about 1. At first glance that looks like a handicap for any electric system — and indeed a direct electric resistance heater is heavily penalised in the label.

A heat pump is different. It does not make heat from electricity; it moves heat, delivering 3 to 4 units of heat per unit of electricity it draws. So even after the 2.5 multiplier, the small electrical input still adds up to less primary energy than burning gas (×1) for the same heat. The Flemish energy agency puts it plainly: a heat pump is "at least three times more efficient than electric heating and at least 50% more efficient than a gas or oil boiler." That is why, in the EPC calculation, swapping a condensing gas boiler for a heat pump moves the label in the right direction.

To see how the heating step fits into the bigger picture, read our fabric-first EPC F-to-C roadmap: you insulate and airtighten first, then size the heat pump to the reduced demand.

What it costs and when it pays off

Costs vary with the technology and how hard the install is. As an indicative 2026 Belgian guide, excluding VAT:

• Air-water heat pump: the unit alone is roughly €5,000–9,000; a full installed system typically €12,000–18,000. Seasonal efficiency depends on the emitters — about SCOP 2.8 on classic 55 °C radiators, 3.5 on mixed emitters, 4.2 on 35 °C underfloor heating.
• Geothermal (ground-source) heat pump: €18,000–30,000 including boreholes, but the highest and most stable efficiency (COP around 4.4–4.8), and the biggest premiums.
• Air-to-air heat pump: €4,000–7,000, the cheapest option, but no domestic hot water and limited premium support.

When does it pay off? The answer is "when the emitters and the envelope are ready." A heat pump on 55 °C radiators in a leaky F-rated house will run at a poor SCOP and disappoint. The same pump on a well-insulated home with underfloor heating or oversized low-temperature radiators runs at a high SCOP, captures the 6% VAT and the regional premium, and lifts the EPC label at the same time. That is why we recommend the fabric-first sequence — and why a heating quote should always follow a room-by-room heat-loss calculation done after the insulation, never sized on the old boiler.

If you are a heating installer, accurate, subsidy-aware quotes win more of these jobs — see how Qote helps contractors.

Plan your heat pump with a realistic estimate

Qote gives homeowners an instant renovation quote that pairs the right heat-pump option with the 6% VAT, the regional premium and an indicative EPC class-jump — so you can see the running cost and the label gain before you commit. Start with the instant estimate.

Frequently asked questions

Is there still 6% VAT on heat pumps in Belgium in 2026?

Yes. The federal 6% VAT on the supply and installation of heat pumps applies for 2026–2030, even for homes under 10 years old. Hybrids that include a gas boiler are excluded, and fossil-fuel boilers now carry 21% VAT.

What COP does a heat pump need for a premium in Belgium?

In Flanders an air-water heat pump needs COP ≥ 4 (EN 14511, A7/W35) plus EU label A+ and a flow temperature ≤ 55 °C. In Wallonia it needs COP ≥ 3.5, and air-to-air heat pumps are excluded from the premium.

Why does a heat pump improve the EPC label if electricity counts more?

Because the EPC score is in primary energy, where electricity is multiplied by 2.5 and gas by about 1. A heat pump delivers 3–4 units of heat per unit of electricity, so the small electrical input still adds up to less primary energy than burning gas — and the label improves.

Do I need underfloor heating for a heat pump to be worth it?

Not strictly, but low-temperature emitters are decisive. Seasonal efficiency rises from roughly SCOP 2.8 on 55 °C radiators to about 4.2 on 35 °C underfloor heating. Oversized low-temperature radiators are a valid alternative when underfloor is impractical.

How much does an air-water heat pump cost in Belgium?

As an indicative 2026 figure, the unit is roughly €5,000–9,000 and a full installed system €12,000–18,000 excluding VAT, before the 6% VAT and the regional premium. Geothermal systems cost €18,000–30,000 but reach higher efficiency.

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