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2. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   Electric heating can either be purely resistance-type heating or make use of a heat pump system to take advantage of low-grade heat in the air or ground. A district heating system uses centrally located boilers or water heaters and circulates heat energy to individual customers by circulating hot water or steam. This has the advantage of a ...

3. Greenwood Clean Energy - Wikipedia

   en.wikipedia.org/wiki/Greenwood_Clean_Energy

   Greenwood has participated with the U.S. Environmental Protection Agency to advocate for the use of more efficient wood boilers. Greenwood Clean Energy's Frontier CX heating appliance meets the requirements for efficiency and emissions outlined in the Washington State Department of Ecology standards of less than 4.5 grams of particulate matter per hour using the Douglas Fir test fuel.

4. Wood-burning stove - Wikipedia

   en.wikipedia.org/wiki/Wood-burning_stove

   Wood burners can triple the level of harmful indoor air pollution. [2] In the 2010s, 61,000 premature deaths were attributable annually to ambient air pollution from residential heating with wood and coal in Europe, with an additional 10,000 attributable deaths in North America. [3]

5. Pellet stove - Wikipedia

   en.wikipedia.org/wiki/Pellet_stove

   A modern pellet stove. A pellet stove is a stove that burns compressed wood or biomass pellets to create a source of heat for residential and sometimes industrial spaces. By steadily feeding fuel from a storage container (hopper) into a burn pot area, it produces a constant flame that requires little to no physical adjustments.

6. 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.

7. Pellet boiler - Wikipedia

   en.wikipedia.org/wiki/Pellet_boiler

   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, or institutional applications.