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Have your boiler checked by an approved technician

In Wallonia an oil or solid-fuel boiler needs a periodic check every year and a gas boiler up to 100 kW every 3 years. In a rental the tenant usually arranges the servicing and keeps the certificate.

Wallonia · Subject to change

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HeatingLevel 3 · UpgradeCost: €100–2,500A few hoursUnder review

Walloon rules require a periodic check of central heating boilers. An oil boiler and a solid-fuel boiler (wood, coal) need one every year. A gas boiler needs one every 3 years if its rated output is 100 kW or less, and every 2 years above that. Any work on the combustion part, such as the burner, calls for an extra check. Installations above 20 kW also get a one-off in-depth diagnosis with advice on improving their efficiency, repeated only if the system or the heating needs change.

Oil and gas boilers must be checked by a technician approved by the AwAC, the Walloon air and climate agency; solid-fuel boilers by a specialised technician. Keep the certificates in the heating file: the user of the installation has to keep at least the last two.

If you rent, the tenant usually has the boiler serviced by an approved technician: every year with chimney sweeping for oil, and for gas as the law or the lease says. Give the certificate to your landlord when asked. Sweeping the chimney is also the tenant's job unless the lease says otherwise. Replacing a boiler or burner that is worn out is up to the landlord.

Details

ImpactIndirect · This saves no energy by itself: it is a rule, a service, a contract, or a health or safety item. How we rate impact
Estimated savingLegal check against air pollution and for energy efficiency; the official texts give no saving figure. (confidence: low)
Who actsYou (tenant)
Needs landlord's agreementNo
TypeAction

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Sources

  1. Arrêté du Gouvernement wallon modifiant l'arrêté du Gouvernement wallon du 29 janvier 2009 tendant à prévenir la pollution atmosphérique provoquée par les installations de chauffage central destinées au chauffage de bâtiments ou à la production d'eau chaude sanitaire et à réduire leur consommation énergétique (in French) · Service public de Wallonie (Wallex) (official source) · checked on
    Backs: periodic check every year for solid and liquid fuel, every 3 years for gas up to 100 kW and every 2 years above; extra check after any work on the combustion part; in-depth diagnosis for installations above 20 kW, not repeated unless the system or the heating needs change
    Where: act of 15 May 2014, art. 8 (replacing art. 13 §1 of the act of 29 January 2009) and art. 9
  2. Réglementation wallonne sur les installations de chauffage central (in French) · Agence wallonne de l'Air et du Climat (AwAC) (official source) · checked on
    Backs: same frequencies; approved technician for oil and gas, specialised technician for solid fuel; the user keeps a heating file with at least the last two check certificates
    Where: summary of the act of 29 January 2009 (last updated 29 October 2015), sections on the periodic check, the technicians and the heating file
  3. Demander un agrément pour les techniciens chauffagistes (in French) · Wallonie (wallonie.be) (official source) · checked on
    Backs: approved heating technicians carry out periodic checks, commissioning and repairs; approvals L, GI, GII, DAI and DAII granted by the AwAC
    Where: démarche page (updated 28 September 2026)
  4. Répartition des réparations, travaux et entretiens à charge du bailleur ou incombant au preneur (in French) · Service public de Wallonie (SPW Logement) (official source) · checked on
    Backs: tenant has the boiler serviced by an approved technician, oil every year with chimney sweeping, gas as the law or the lease says, and gives the certificate when the landlord asks; tenant bleeds radiators and keeps the pressure right; chimney sweeping is the tenant's job unless the lease says otherwise; landlord replaces a worn-out boiler or burner
    Where: section 'Chauffage', rows 'Chaudière, convecteurs au gaz, radiateurs' and 'Conduits de cheminée'

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