Kalorina Mini K-BlackA++Class 5
22–32 kW
Kalorina Mini K-Black — Front view
"Black Box" version of the Kalorina Mini K: compact biomass boiler, Class 5 EN 303-5:2021, energy class A++ and 5 environmental stars, black casing and reduced footprint (37 cm wide for the Mini K20 Black) for installation against the wall. Automatic tube-bundle cleaning as standard, hot water up to 90 °C, 3 bar, compatible with solar thermal. 22 or 32 kW, modulation from 25% to 100%.
Black "Black Box" casing and ultra-compact structure: 370 mm wide (Mini K20 Black), installation directly against the wall
Available models(2 variants)
Manufacturer-certified fuels
Compliant with European EN ISO 17225 standards — performance guaranteed by the original technical sheet.
Wood pellets
Cylindrical compressed wood pellets, Ø6 to 8 mm, moisture < 10%. Standard high energy density fuel.
Log wood
Dry log wood, length 33 to 50 cm, moisture < 25%. Manual loading, autonomy depending on the firebox.
Olive pomace
Pressed olive residues, moisture < 15%. Recovered byproduct from Mediterranean oil mills.
Crushed shells
Crushed nut shells (almond, hazelnut, walnut), moisture < 15%. Circular solution for farms.
Specifications according to the manufacturer's technical sheet. Using non-compliant fuels voids the warranty and may shorten the boiler's lifespan.
Kalorina Mini K-Black: grants
In Germany, replacing a heating system with a biomass boiler (pellets, logs, wood chips) in an existing residential building is subsidised by KfW (programme 458, Federal Funding for Efficient Buildings).
KfW 458 — heating grant for private individuals (BEG EM)
Base grant of 30 % of eligible costs, plus bonuses depending on the situation (climate speed, household income); up to 70 %, or 80 % with the income bonus. Eligible costs capped at €28,000 for a single-family house.
- EXISTING residential building; apply to KfW BEFORE work starts
- Supply or service contract signed with a condition precedent or subsequent
- Climate speed bonus (16 %) when replacing a gas or biomass heating system at least 20 years old; it decreases from 01/02/2027
- Income bonus (40, 30 or 10 %) for owner-occupiers depending on taxable household income
Information checked on October 14, 2026.
