Heating in Brussels, Flanders and Wallonia

Checked on 2 October 2026

1. In the Brussels region, the PEB periodic inspection is mandatory every 2 years for a gas boiler or gas water heater, and every year for an oil or solid fuel boiler.

   Source:environnement.brussels

2. In the Brussels region, the PEB periodic inspection is also required when a gas water heater is installed, after work on combustion (adjusting, repairing or replacing the burner) and when a boiler is moved within the same system.

   Source:environnement.brussels

3. In the Brussels region, the PEB periodic inspection must be carried out by a PEB boiler technician accredited by Bruxelles Environnement, with the accreditation that matches the appliance.

   Source:environnement.brussels

4. In the Brussels region, the data from a PEB periodic inspection are sent automatically to Bruxelles Environnement and an official PDF certificate is generated. If the appliance is non-compliant, the owner must bring it into compliance within 5 months.

   Source:environnement.brussels

5. In the Brussels region, when a property is rented, the tenant must have the PEB periodic inspection done unless the lease names someone else; the owner remains responsible for meeting the PEB requirements.

   Source:environnement.brussels

6. In the Brussels region, the PEB heating diagnostic for type 1 systems (a single boiler of at most 100 kW) was abolished on 1 January 2019. It now only applies to type 2 systems, every 5 years.

   Source:environnement.brussels

7. In the Brussels region, the PEB reception of the heating system must be carried out within one month of commissioning a boiler, or a heat pump above 12 kW, by an accredited type 1 or type 2 PEB heating advisor.

   Source:environnement.brussels

8. In the Brussels region, the owner must have the PEB reception of the heating system carried out; if it is non-compliant, the owner has 5 months to fix it, after which a new PEB reception is needed.

   Source:environnement.brussels

9. In the Brussels region, unless a derogation is granted, oil boilers may no longer be installed since 1 June 2025, including as replacements. Existing boilers may keep running, with an annual PEB periodic inspection.

   Source:environnement.brussels

10. In the Brussels region, since 1 January 2019, atmospheric gas boilers and water heaters of type B11BS may no longer be installed on an individual chimney or a new collective chimney.

    Source:environnement.brussels

11. In the Brussels region, since 1 January 2025 (planning permit filing date), projects made up only of new or equivalent-to-new PEB units may no longer include a boiler or cogeneration unit running on natural gas or oil.

    Source:environnement.brussels

12. In the Brussels region, from 1 January 2030 (planning permit filing date), the natural gas and oil ban will extend to projects with new, equivalent-to-new or heavily renovated units, but not to simple renovations.

    Source:environnement.brussels

Checked on 2 October 2026

1. In Flanders, an oil-fired central heating boiler of 20 kW or more must be serviced every year by a certified liquid fuel technician, and a gas boiler of 20 kW or more every two years by a certified gaseous fuel technician. A solid fuel central heating appliance is serviced every year by a qualified professional, whatever its output.

   Source:codex.vlaanderen.be

2. In Flanders, the owner of a new central heating appliance must have it inspected before it is put into use. For an oil or gas appliance, the inspection is carried out by a certified liquid or gaseous fuel technician.

   Source:codex.vlaanderen.be

3. In Flanders, after servicing a central heating appliance, the technician gives the user the cleaning certificate and/or combustion certificate. The user and the owner keep at least duplicates of the certificates from the last two services.

   Source:codex.vlaanderen.be

4. In Flanders, the periodic heating audit (verwarmingsaudit) of central heating appliances is no longer mandatory: the provision requiring it in the central heating appliances decree was repealed with effect from 1 July 2024.

   Source:codex.vlaanderen.be

5. In Flanders, installing an oil-fired boiler is prohibited in residential and non-residential buildings for which the environmental permit for new construction or a major energy renovation is applied for from 1 January 2022.

   Source:codex.vlaanderen.be

6. In Flanders, since 1 January 2022, an oil boiler or boiler body in an existing building may only be replaced by an oil boiler if no natural gas network is available in the street at the building, or if the building cannot be connected by underground drilling to the gas main on the other side of the street.

   Source:codex.vlaanderen.be

7. In Flanders, gas distribution system operators no longer connect new buildings, residential or non-residential, to the natural gas network where the environmental permit is applied for from 1 January 2025.

   Source:codex.vlaanderen.be

8. In Flanders, the connection to the natural gas distribution network also includes the metering installation (the gas meter). The gas distribution system operator maintains the connection and keeps it working properly and safely.

   Source:assets.vlaamsenutsregulator.be

Checked on 2 October 2026

1. In Wallonia, the periodic control of a boiler is carried out every year for all oil boilers and every three years for small domestic gas boilers, by a technician approved for liquid or gaseous fuels.

   Source:energie.wallonie.be

2. In Wallonia, the decree of 29 January 2009 sets the minimum frequency of the periodic control: yearly for solid and liquid fuels; for gaseous fuels, every three years when the nominal useful output is 100 kW or less and every two years above that. A control is also carried out after every intervention on the combustion part of the heat generator.

   Source:wallex.wallonie.be

3. In Wallonia, the person who carries out the periodic control gives the user a control certificate following the model set by the Minister, and both the user and that person keep the last two certificates.

   Source:wallex.wallonie.be

4. In Wallonia, if the central heating installation is declared non-compliant after the control, the owner or the user, as the case may be, must have the elements concerned repaired or adapted within five months.

   Source:wallex.wallonie.be

5. In Wallonia, when a boiler is installed or replaced, the new gas or oil heat generator must undergo a reception check (réception) by a technician approved for gaseous or liquid fuels, as the case may be.

   Source:energie.wallonie.be

6. In Wallonia, boiler maintenance itself is not regulated by Walloon law, unlike the periodic control; a periodic control is mandatory when the maintenance involved the combustion chamber.

   Source:energie.wallonie.be

7. In Wallonia, when the installed nominal output of a central heating installation exceeds 20 kW, the owner must have a deep diagnostic (diagnostic approfondi) carried out as part of the periodic inspection. It does not need to be repeated as long as no change has been made to the heating system or to the building’s heating requirements.

   Source:wallex.wallonie.be

8. In Wallonia, when the acknowledgement of receipt of the permit application is dated after 31 December 2025, a newly built or rebuilt building or EPB unit may not include a heating or domestic hot water system running on heating oil or coal.

   Source:wallex.wallonie.be

9. In Wallonia, from 1 January 2031, it is prohibited in existing residential and non-residential buildings to install a liquid fuel (heating oil) or coal boiler, or to replace a heat generator or boiler body with one running on liquid fuel or coal.

   Source:wallex.wallonie.be

10. In Wallonia, as an exception to that ban, replacing the burner of liquid fuel boilers remains allowed until 31 December 2034, and the Government may grant exemptions when the requirement is not technically, economically or functionally feasible.

    Source:wallex.wallonie.be

11. In Wallonia, the gas distribution system operator makes the standard connection free of charge for any residential customer whose installations are no more than 8 metres from the main pipe, plus any road crossing. The free connection requires domestic gas use to start within twelve months of the connection.

    Source:wallex.wallonie.be

12. In Wallonia, to have a gas connection put into service, the customer presents the installation’s reception report from an approved body or the completion certificate from a qualified installer, and the network operator carries out a tightness test.

    Source:cwape.be

Checked on 28 September 2026

1. In Belgium, the FPS Economy states that a gas installation must be inspected before it is put into service or when it is modified. When the gas meter is opened, the distribution system operator must make sure the indoor installation is gas-tight at distribution pressure.

   Source:economie.fgov.be

2. Under Regulation (EU) 2024/573, which applies directly in Belgium, the installation, maintenance or servicing, repair and decommissioning of stationary air-conditioning equipment and heat pumps containing fluorinated greenhouse gases must be carried out by certified natural persons.

   Source:eur-lex.europa.eu

3. From 1 January 2027, placing on the market air-to-water split systems with a rated capacity up to and including 12 kW that contain fluorinated greenhouse gases with a GWP of 150 or more is banned, except where required to meet safety requirements at the site of operation.

   Source:eur-lex.europa.eu

4. From 1 January 2027, placing on the market plug-in room air conditioners, monoblock air conditioners, other self-contained air-conditioning equipment and self-contained heat pumps with a maximum rated capacity up to and including 12 kW that contain fluorinated greenhouse gases with a GWP of 150 or more is banned, except where required by safety requirements, in which case the GWP limit is 750.

   Source:eur-lex.europa.eu

5. In Belgium, in a co-owned building, where the title deeds are silent or contradictory, the parts of buildings or land used by all co-owners, or by some of them, are deemed to be common parts.

   Source:ejustice.just.fgov.be

6. Co-ownership charges, in particular maintenance, repair and renovation costs, are shared according to the respective value of each private unit, unless the parties decide to share them in proportion to the usefulness for each private unit.

   Source:ejustice.just.fgov.be

7. The syndic (building manager) is responsible for carrying out, and having carried out, the decisions of the general assembly, and for performing all protective acts and all acts of provisional management.

   Source:ejustice.just.fgov.be

8. In Belgium, the general assembly of a co-ownership decides by a two-thirds majority of the votes on all works affecting the common parts. Works required by law and protective or provisional management works can be decided by an absolute majority of the votes of the co-owners present or represented.

   Source:ejustice.just.fgov.be