The wood boiler remains the most economical heating solution for homes in areas with cheap firewood access, especially in semi-urban and rural areas. For 100 sqm, correct power selection is critical, a wood boiler works best when operating at 70–90% of its nominal power, not at 40–50%.
How Many kW You Need for 100 sqm
| Building characteristics | Required Power |
|---|---|
| Good insulation, Zone A–B | 13–18 kW |
| Medium insulation, Zone B–C | 18–25 kW |
| Older construction, Zone C–D, cold mountainous | 25–32 kW |
Note: In wood boilers, better to size slightly higher than pellet, because wood’s calorific value depends heavily on moisture (15–20% moisture = 4.2 kWh/kg, 30% moisture = only 3.0 kWh/kg).
Recommended AXINAR Models for 100 sqm
1. AXINAR BM30, The Classic Wood Boiler 30 kW
Our most proven model for homes of 90–140 sqm. Simple, durable, efficient.
- Lambda sensor for correct combustion control
- Large loading door, accepts logs up to 55cm
- Autonomy 8–12 hours per wood loading
2. AXINAR PESKON PSK30, With Integrated Heat Exchanger
If you need both space heating AND domestic hot water without a separate tank, PESKON PSK30 does it in one unit.
- 30 kW wood plus domestic hot water exchanger
- No need for separate boiler tank
- Compact, ideal for small boiler rooms
Indicative Annual Wood Consumption (100 sqm)
- Zone A: 3–4 solid cubic meters of dry wood
- Zone B: 4–5.5 cubic meters
- Zone C: 5.5–7 cubic meters
- Zone D: 7–9 cubic meters
Consumption depends significantly on wood quality. Dry wood (2 years stored) delivers double the heat of fresh. Also, hardwoods (holm oak, beech) have 20–30% higher calorific value than softwoods (pine, fir).
What You Need to Know Before Buying
- Storage space: For 100 sqm you’ll need ~15 sqm of wood storage (covered, ventilated) to have dry wood ready.
- Buffer tank: Essential for wood boilers. Capacity ~15–20 liters per kW (i.e. ~450–600 liters for BM30). Stores excess heat, reduces loading to 1x per day.
- Chimney: Ø160–180mm double-walled stainless steel. Higher than pellet (lower flue gas temperature).
- Manual loading: Wood boiler requires daily loading (1–2 times). If you want 3–5 day autonomy, consider pellet.
Pellet or Wood for 100 sqm? Quick Comparison
| Wood | Pellet | |
|---|---|---|
| Boiler purchase cost | Lower (~30–40%) | Higher |
| Fuel cost/kWh | Lower | Medium |
| Autonomy | 8–12 hours | 2–5 days |
| Daily handling | Demanding | Minimal |
| Storage space | A lot (ventilated) | Little (closed) |
Want a Customized Proposal for Your Home?
Send us the basics of your setup and we’ll get back within 24 hours with a specific model recommendation and indicative installation cost.
Need detailed information for larger homes? See the complete boiler selection guide with examples from 85 to 320 sqm.
