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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. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   A condensing boiler Hot water central heating unit, using wood as fuel. A central heating system provides warmth to a number of spaces within a building from one main source of heat. It is a component of heating, ventilation, and air conditioning (short: HVAC) systems, which can both cool and warm interior spaces. A central heating system has a ...

4. Furnace (central heating) - Wikipedia

   en.wikipedia.org/wiki/Furnace_(central_heating)

   The second category of furnace is the forced-air having atmospheric burner style with a cast-iron or sectional steel heat exchanger. Through the 1950s and 1960s, this style of furnace was used to replace the big, natural draft systems, and was sometimes installed on the existing gravity duct work.

5. Pellet boiler - Wikipedia

   en.wikipedia.org/wiki/Pellet_boiler

   Central pellet heating system standing in the cellar. A pellet boiler is a heating system that burns wood pellets. Pellet boilers are used in central heating systems for heat requirements (heating load) from 3.9 kW to 1 MW (megawatt) or more. Pellet central heating systems are used in single family homes, and in larger residential, commercial ...

6. Pellet stove - Wikipedia

   en.wikipedia.org/wiki/Pellet_stove

   Pellet stoves can be either free-standing units or fireplace inserts vented into an existing chimney. Most pellet stoves are constructed using large, heat-conductive, steel or cast-iron pieces, with stainless steel to encase circuitry and exhaust areas. Pellet furnaces and pellet boilers are also available in addition to the decorative stove ...

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