Boiler in a rental: who pays, landlord or tenant
Boiler repair and replacement in rental properties in Belgium. Cost allocation between landlord and tenant according to the type of work.
Cost allocation principle
The allocation of boiler costs between landlord and tenant follows the general principle of Belgian law: the landlord assumes major repairs (structure, replacement) and the tenant the minor repairs (routine maintenance).
Allocation grid
| Intervention | Landlord | Tenant |
|---|---|---|
| Annual/biennial maintenance | X | |
| Replacement of wear parts | X | |
| Repair due to maintenance neglect | X | |
| Structural repair | X | |
| Full replacement | X | |
| Compliance upgrade | X | |
| Repair due to hidden defect | X |
This principle applies to all types of leases. See our guide on the landlord’s obligations for more details.
Common repairs
At the tenant’s expense
Routine maintenance repairs:
- Cleaning the burner and heat exchanger body
- Replacing filters
- Replacing the thermocouple
- Replacing the temperature probe
- Unclogging the condensate siphon
Average cost: 80 to 300 EUR per intervention.
At the landlord’s expense
Major repairs:
- Replacing the heat exchanger body
- Replacing the exchanger
- Repairing the hydraulic circuit
- Replacing the circulation pump
- Bringing flue gas evacuation up to standard
Average cost: 500 to 3,000 EUR per intervention.
For the complete list of tenant repairs, see our guide on works in a rental.
Boiler replacement
When to replace
| Signal | Urgency |
|---|---|
| Boiler over 20 years old | Planned |
| Repeated breakdowns (3+ per year) | Medium term |
| Efficiency < 80% | Medium term |
| Carbon monoxide leak | Immediate |
| Spare parts unavailable | Short term |
Replacement cost
| Boiler type | Indicative cost |
|---|---|
| Gas condensing boiler | 3,000 - 6,000 EUR |
| Oil condensing boiler | 4,000 - 8,000 EUR |
| Heat pump | 8,000 - 15,000 EUR |
| Biomass boiler (pellets) | 6,000 - 12,000 EUR |
The landlord can recover part of the cost through regional energy grants and tax deductions. See our guide on rental taxation.
In case of dispute
If the landlord refuses to repair
- Send a formal notice by registered letter
- Set a reasonable deadline (15 days for a repair, longer for a replacement)
- If no response, refer to the justice of the peace
- The judge can order the works and grant a rent reduction
If the tenant neglects maintenance
- Note the absence of a maintenance certificate
- Send a formal notice reminding the tenant of the contractual obligation
- In case of breakdown due to maintenance neglect, the tenant bears the costs
- Deduct repairs from the rental deposit at the end of the lease
The key is to put everything in writing. Keep maintenance certificates and repair invoices to avoid any dispute. To create a lease with clear clauses, use our lease generator.