Changing your heating: checks before signing
Published on 31 July 2026 · Verified on 18 September 2026 · The Mestravaux.lu team
Replacing heating involves more than choosing equipment. Before signing, clarify building needs, adaptations and grant conditions. This guide provides a preparation checklist without guaranteed savings or standard costs for mistakes.
The essentials in 30 seconds
- Ask for a sizing justification instead of copying the old output.
- Check the grant procedure for the equipment and project dates.
- Itemise adaptations and distinguish maintenance, inspections and repairs.
Choosing equipment before assessing the building
Gather available plans, consumption with its reporting periods, usage and planned insulation work. Ask how the proposed output was established and whether existing emitters suit the intended conditions. Do not decide to replace all radiators solely because of their age.
| Erreur | Coût si elle est commise |
|---|---|
| Remplacement fossile → fossile sans comparer | Perte de l'aide Klimabonus (plusieurs milliers d'euros) |
| Dossier Klimabonus déposé après travaux | Perte totale de l'aide, sans recours |
| Poêle/insert posé sans tubage | 800 – 2 800 € à refaire, risque sécurité et assurance |
| Radiateurs non dimensionnés pour une PAC | 300 – 900 € par radiateur à reprendre + confort dégradé |
| Silo biomasse sous-dimensionné | Livraisons fréquentes, surcoût logistique récurrent |
| Pas de contrat d'entretien | Dépannage d'urgence à 250 – 400 € au lieu de 120 – 300 € |
| Cuve fioul mal déposée | Nouvelle intervention 800 – 3 000 € + risque pollution |
Estimations Luxembourg 2026, hors conséquences indirectes (retard de chantier, litige assurance).
Deducting a grant before checking the application
Klimabonus distinguishes eligible equipment and its conditions. The official page also includes prefinancing rules from 1 January 2027. Check the scheme, dates, documents and procedure for your investment. Do not confuse insulation procedures with those for technical equipment; a blanket claim that every application after work starts is lost is insufficient.
Overlooking adaptations around the equipment
Have connections, electrical supply, ducts, condensate and relevant siting constraints assessed. For pellets, ask how storage and deliveries will work. For an old tank, define the required service separately. These are assessment points, not identical works automatically required in every home.
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Request a quoteTreating maintenance and inspection as one service
For gas, Creos specifies an installation inspection every four years by an authorised professional. Distinguish this from maintenance and possible repairs. Specify scope, frequency, exclusions and response conditions without assuming priority service or freedom from breakdowns.
Comparing totals for different scopes
Check removal, equipment, adaptations, commissioning and supplied documents. Add recurring costs and excluded services. Request the schedule and service interruptions for your project. A savings claim needs a method, assumptions and limitations; it does not guarantee lower future bills.
Frequently asked questions
Does every heating replacement follow the same grant procedure?
No. Check the equipment and scheme conditions on Guichet and confirm the steps before committing.
Must the flue always be replaced?
Have its compatibility and condition assessed for the selected equipment. This page cannot determine whether a liner is needed or establish your insurance coverage.
What if I have already signed the quote?
Gather the quote, dates and supporting documents. Ask the installer about unresolved technical points and the administration about options for your case, without assuming automatic refusal.
Take action
Your project deserves an accurate estimate — it's free.
Request a quote