tar deposit inside the wood fuel boiler shinny black solid | 
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| navigate by keyword : alternative ashes background biofuel biomass black boiler burn chamber condenser consumption creosote dark deposit domestic eco ecological ecology economy energy environment fire fireplace flame fuel glowing heat heater hot industrial industry inside light pellet pellets room shinny solid solidfuel system tar technology wood wooden		 | 
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| Tar deposit inside the wood fuel boiler. Shinny black deposit inside the solid fuel boiler. Creosote deposit. | 
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