EcoDesign 2022 and EN 303-5 Class 5: what your Luxembourg permit file must include

Why is EcoDesign and EN 303-5 Class 5 compliance now non-negotiable?

Since 1 January 2022, EU Regulation 2015/1189 sets strict seasonal efficiency and emission thresholds for any biomass boiler ≤ 500 kW sold in the EU. In Luxembourg, this stacks with EN 303-5 Class 5, the standard governing solid-fuel boiler performance.

For architects, this means a non-compliant "wood" boiler cannot be installed in a new build or a major renovation. The EcoDesign certificate and the EN 303-5 Class 5 test report become expected attachments to the permit file.

What does the administration actually check on compliance?

The administration does not only check the brand — it checks the numbers in the test report. Three indicators cover 90 % of the compliance review.

• Declared nominal output and seasonal efficiency (≥ 77 % for pellet boilers in Class 5).
• Emissions of CO, NOx, particulates and OGC below the Class 5 thresholds.
• Reference to EU Regulation 2015/1189 on the rating plate and in the technical documentation.
• EN 303-5 certificate issued by an accredited laboratory.
• Compatibility with certified fuels (e.g. ENplus pellets for the European market).

Design-stage checklist to secure the permit

Three documents are enough to anticipate: the manufacturer's datasheet citing EcoDesign compliance, the EN 303-5 Class 5 test report, and the fuel certification (ENplus for pellets). Tatano, an Italian maker with 4 generations of know-how, ships these documents with every boiler.

• Explicitly mention "compliance with EU Regulation 2015/1189" in the technical notice of the permit.
• Attach the EN 303-5 Class 5 test report as an annex.
• Specify the fuel (ENplus pellets) and the sized storage silo.
• Plan a buffer tank: +15 % bonus on the national Klimabonus.

Klimabonus 2026: the financial lever that lifts profitability

Klimabonus 2026 targets only wood-pellet boilers. For a single-family home, the grant reaches up to €8,000 (€4,000 without replacing an old system). Multi-family: €6,000 per unit, capped at €40,000. District heating: €6,000, capped at €24,000.

Municipal grants complement the scheme — but their amount varies by commune (some offer nothing). The official Klima-Agence simulator lets you verify the stack before filing the permit.