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2. Outdoor wood-fired boiler - Wikipedia

   en.wikipedia.org/wiki/Outdoor_wood-fired_boiler

   The outdoor wood boiler is a variant on the indoor wood, oil or gas boiler. An outdoor wood boiler or outdoor wood stove is a unit about 4-6 feet wide and around 10 feet long. It is made up of four main parts- the firebox, which can be either round or square, the water jacket, the heat exchanger, and the weather proof housing.

3. Pellet heating - Wikipedia

   en.wikipedia.org/wiki/Pellet_heating

   Pellet heating is a heating system in which wood pellets (small pellets from wood chips and sawdust) are combusted. Other pelletized fuels such as straw pellets are used occasionally. Today's central heating system which run on wood pellets as a renewable energy source are comparable in operation and maintenance of oil and gas heating systems.

4. Wood fuel - Wikipedia

   en.wikipedia.org/wiki/Wood_fuel

   Outdoor wood boilers also typically have short stack heights in comparison to other wood-burning appliances, contributing to ambient levels of particulates at ground level. An increasingly popular alternative is the wood gasification boiler, which burns wood at very high efficiencies (85-91%) and can be placed indoors or in an outbuilding.

5. Wood-burning stove - Wikipedia

   en.wikipedia.org/wiki/Wood-burning_stove

   Seasoning by air-drying the wood can take three years or more. Wood is dried in outdoor well-ventilated covered structures, or in a kiln. All wood will release creosote vapors when burned. Modern stoves will burn the vapors, either via direct secondary combustion or via a catalyst. Very little, if any, creosote will escape a properly operating ...

6. At Your Service: Outdoor furnace question - AOL

   www.aol.com/news/outdoor-furnace-090034408.html

   Rob looks into outdoor furnaces for a reader. For premium support please call: 800-290-4726 more ways to reach us

7. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   His system was also adapted for use by bakers in the heating of their ovens and in the making of paper from wood pulp. Franz San Galli, a Prussian-born Russian businessman living in St. Petersburg, invented the radiator between 1855 and 1857, which was a major step in the final shaping of modern central heating.