The concept of ecological and economic heating. Wooden pellets.

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Photo credit: © JIRI HERA / Alamy / Afripics
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Keywords: alternative, bio, biological, biomass, block, burn, compressed, eco, ecologic, ecological, ecology, economy, energy, fuel, heat, home, house, mass, nature, pellet, pellets, power, renewable, save, top, toy, view, winter, wood, wooden