In 2026, no Belgian region subsidises a gas condensing boiler any more. Flanders removed the grant on 1 November 2023 and, since 1 July 2025, funds no fossil-fuel boiler at all, whatever the income category. The only exception still supported is the hybrid heat pump, pairing a heat pump with a back-up boiler. In Wallonia it has also been prohibited since 1 January 2026 to install an oil or coal boiler in a new building.
The end of grants, step by step
Public support for gas boilers has disappeared in a few years, and it is not a budget accident: it is a deliberate policy decision to stop funding new fossil-fuel equipment.
- Flanders — the grant for installing a gas condensing boiler has been removed since 1 November 2023, with an application window until 31 October 2024. Since 1 July 2025, no grant at all is awarded for a fossil-fuel boiler, gas or oil, regardless of income category.
- Wallonia — the Primes Habitation no longer include a grant for a gas boiler. Support is concentrated on the heat pump and renewable systems.
- Brussels — Renolution grants have been suspended since 1 January 2025, across all categories of work.
⚠️ Walloon ban in new builds. Since 1 January 2026 it has been prohibited in Wallonia to install an oil or coal boiler in any new building — the rule applies to permits filed after 31 December 2025. The regulatory framework for fossil heating is tightening across all three regions; always check what applies to your project before ordering.
The hybrid heat pump: the only route still supported
A hybrid heat pump pairs a heat pump, covering most of the heating season, with a back-up boiler that takes over in deep cold. It is the compromise designed for homes whose insulation does not yet allow a heat pump alone.
In Flanders it remains grant-aided: since 1 March 2026 the amount is €800 for income categories 1 and 2 (down from €1,500), and higher for categories 3 and 4. In Wallonia it falls under the Primes Habitation with a mandatory prior audit.
Be aware, though: the hybrid grant is markedly lower than for a full heat pump, and you stay dependent on gas. It is a transition step, not a destination.
Should you still invest in gas?
The question deserves an answer without dogma, because it depends on the building.
Where it is defensible: your boiler is dying, your home is poorly insulated, your radiators run at high temperature, and you do not have the budget to do insulation and a heat pump back to back. A condensing boiler is then still far more efficient than an old atmospheric unit, and 6% VAT still applies for a home older than ten years. It is a short-term decision, to be owned as such.
Where it is a mistake: you plan to stay a long time, your home is insulated or being insulated, and you are replacing a boiler that still works. You are then investing in equipment with no grant, under a tightening regulatory framework, while the heat pump has enjoyed 6% VAT with no age condition since 1 January 2026 and remains supported everywhere.
The right reflex: look at the building envelope before replacing a heating system. An insulated roof reduces the power needed, which changes both the choice of appliance and its cost.