Replacing an old heating system is one of the most effective levers to improve the energy performance of a home. In Belgium, both in Brussels and Wallonia, the Regions strongly encourage homeowners to modernize their installations, particularly by replacing old energy-consuming boilers with more efficient and environmentally friendly systems.
Heat pumps, biomass boilers, solar water heaters, or pellet stoves: many technologies are today eligible for substantial grants, provided certain criteria are met. This page presents all the heating aids available in 2025, the amounts, the technical conditions to be met, as well as the steps to follow. You will also discover how Avenir Rénovations supports you in securing your project.
An outdated heating system consumes more energy, costs more to operate, and emits more CO₂. By replacing it with modern equipment, you:
This is why public authorities provide significant financial assistance for these investments, particularly as part of the energy transition.
The main heating installations covered by the grants are:
| Type of equipment | Base grant (R5) | Max grant (R1) |
| Combined heating heat pump | 600 € | 3,600 € |
| Sanitary hot water heat pump | 280 € | 1,680 € |
| Biomass boiler | 720 € | 4,320 € |
| Local biomass stove | 160 € | 960 € |
| Solar water heater | 420 € | 2,520 € |
| Double flow ventilation | 680 € | 4,080 € |
In addition, there are grants for:
The amounts are increased based on your income category (R1 to R4). People in category R1 can receive up to 6 times the base grant.
Replacement of an oil boiler with a heat pump + thermodynamic water heater:
| Type of equipment | Maximum grant amount |
| Air/water heat pump | up to 4,500 € |
| Hot water heat pump | up to 2,500 € |
| Condensing boiler (gas) | up to 1,200 € |
| Biomass stove (pellets) | up to 1,500 € |
| Solar water heater | up to 3,500 € |
| Smart regulation (thermostat) | up to 400 € |
The amounts depend on several factors:
In some cases, an energy audit is recommended to obtain a bonus or prioritize the most effective work. It can also be subsidized up to 700 € through RENOLUTION.
All heating equipment installed in a residential building over 10 years old is eligible for the reduced VAT rate of 6%, provided that:
This VAT reduction applies in both Wallonia and Brussels.
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