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