A wood boiler It's a centralized biomass heating system that generates heat by burning wood to heat water. This hot water is then distributed throughout the home via a network of radiators or underfloor heating. It's one of the most economical and environmentally friendly alternatives to traditional fossil fuels. Unlike a traditional wood-burning stove, a boiler heats the entire house; a stove only heats the room where it's installed.
Main types of wood boilers
- Traditional combustion boilersThey operate by natural or forced draft. They have lower efficiency and require more frequent wood loading.
- Gasification boilers (Inverted flame)These are the most efficient. They burn the wood in an upper chamber and the resulting gases in a lower chamber. They achieve efficiencies exceeding 90%.
- Combination or multi-fuel boilersThey allow you to alternate firewood with other fuels such as pellets, offering greater flexibility.
Advantages and Disadvantages
Aspect
Advantages
Disadvantages
Economy
Fuel is very cheap or free if you have direct access to wood.
The initial investment for purchase and installation is high.
Sustainability
Renewable energy with a neutral CO₂ emissions balance.
It requires a large, dry physical space to store firewood.
Performance
Advanced technology (gasification) that makes the most of every log.
It requires constant manual maintenance (daily loading and ash cleaning).
Essential components in an installation
- Inertia reservoirThis is a mandatory water tank for gasification boilers. It stores the excess heat generated and releases it according to the house's demand. It allows the boiler to be turned on only once a day.
- Suitable chimneyIt must be made of insulated stainless steel and have the correct draft to prevent corrosive liquid condensation inside the pipe.
- Lambda sensor: Present in high-end models to automatically regulate air intake and optimize combustion.
- Flue gas outlet regulation kitIn the case of Bronpi, this Spanish manufacturer provides a kit to regulate the chimney draft, greatly increasing the efficiency of the boiler (essential for Tecno Hydrobronpi)
Leading brands in the market
- Hargassner: Austrian premium manufacturer known for its high-tech gasification boilers and optional automatic ignition.
- Lasian: Spanish brand with excellent cast iron and steel options for both single and mixed firewood. Lasian Solimax Plus Solid Fuel Boiler – Efficient heating for biomass and solid fuels.
- Bronpi: Recognized national manufacturer specializing in biomass equipment, wood stoves and hydronic stoves. Bronpi Tecno-Hydrobronpi – High-efficiency pellet thermo-chimney insert boiler.
- VigasSpecialists in inverted flame boilers with great autonomy and high energy efficiency.
- Ecoforest: Spanish firm that stands out for its innovations in technology applied to biomass heating.
- Ferlux: company based in Malaga, specializing in wood heating equipment. FERLUX HOGAR K-100 – Wood Burning Insert Thermofireplace
Facility
Installation is simple: it takes advantage of the existing heating system in the home and can even be combined with traditional gas or oil heating, using a valve with 2 positions to choose one fuel or the other.
Fuel supply
In countries with high biomass production, the wood-burning boiler for chalets is one of the most cost-effective wood-burning systems since wood is much cheaper than fossil fuels.
In countries like Spain and Italy, which have large olive oil production, a lot of firewood is obtained from olive pruning. France also has a significant firewood production from its olive groves.
With the evolution of traditional fuels, firewood has emerged as one of the most efficient and economical fuels.
