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What Size Wood Stove Do You Need?

Built by Kevin Glover · @gloverbuilds · Verified formula

Calculate wood stove BTU needs by room size, insulation, and climate zone.

📅 Updated April 2026 ✅ Formula verified 📖 4 min read 🆓 Free · No sign-up

In this article

Sizing a Wood Stove
Efficiency Matters

Dimensionierung

Faustregel: 0,1 kW/m² (gut gedaemmt). 30 m² Wohnzimmer: 3 kW. Haeufiger Fehler: zu grosse Oefen — Raum wird zu heiss, Ofen laeuft gedrosselt (schlecht fuer Oefen und Umwelt). BImSchV (Bundes-Immissionsschutzverordnung) regelt Emissionsgrenzwerte.

Brennholz

Buche: bester Brennwert. 3-6 Raummeter pro Saison (Zuheizung). Mindestens 1-2 Jahre trocknen. Schornsteinfeger-Pflicht: 1-2× jaehrlich Kehr- und Messpflicht.

⚡ CalcWolf Insight

The most important wood stove spec is the EPA emissions rating. Stoves under 2.0 g/hr are cleanest and most efficient, and are eligible for a 26% federal tax credit.

Frequently asked questions

Welche kW fuer 30 m²?▾

3 kW bei guter Daemmung. Zu gross = staendig drosseln = schlecht.

Schornsteinfeger noetig?▾

Pflicht: 1-2× jaehrlich. Kehr- und Messpflicht nach BImSchV.

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Kevin Glover · @gloverbuilds

Founder, CalcWolf · GLVTS · Blickr

All formulas sourced from primary references — IRS publications, peer-reviewed research, and official standards. Results are tested against independent reference calculators before publishing. Rates and brackets updated when official sources change. Editorial policy →