How often must a gas boiler be inspected in Wallonia?

In Wallonia, have a central heating gas boiler inspected every 3 years by a certified technician. Above 100 kW the interval is 2 years.

During the periodic inspection, the technician measures combustion and checks whether the installation meets Walloon requirements. The interval runs from the date the boiler was first put into service, with a margin of 3 months. If the boiler fails, the fault must be repaired within 5 months.

1. Look up the date the boiler was first used and of the last inspection
2. Book a certified technician
3. Have combustion measured and the inspection certificate filled in
4. Keep the certificate with your central heating file

45 to 90 minutes.

• appointment with a certified technician
• central heating file

Wallonia (Belgium): under the Walloon Government decree of 29 January 2009, the user must have a gas central heating system inspected by a certified technician every 3 years, or every 2 years above 100 kW. Above 20 kW an in-depth assessment is also required, repeated only after the installation is changed.

This rule applies in Wallonia. Flanders and Brussels have their own intervals, which are on the other boiler pages.

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Work safely and follow the manual. If in doubt, or if it involves gas, combustion or working at height, leave it to a qualified professional.

Source

• Service public de Wallonie – WALLEX (Waalse wetgeving) — Arrêté du Gouvernement wallon du 29 janvier 2009 tendant à prévenir la pollution atmosphérique provoquée par les installations de chauffage central (art. 10 en 13, geconsolideerd)

Checked on: 2026-09-27

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