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2. 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.

3. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   The degree of efficiency of the system has been calculated at 90%. [8] In the 13th century, the Cistercian monks revived central heating in Christian Europe using river diversions combined with indoor wood-fired furnaces.

4. Furnace (central heating) - Wikipedia

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

   The fourth category of furnace is the high-efficiency condensing gas furnace. High efficiency condensing gas furnaces typically achieve between 90% and 98% AFUE. [3] A condensing gas furnace includes a sealed combustion area, combustion draft inducer and a secondary heat exchanger. The primary gain in efficiency for a condensing gas furnace, as ...

5. Biden administration updates furnace efficiency standards for ...

   www.aol.com/lifestyle/biden-administration...

   The Energy Department issued its final efficiency rules for residential furnaces on Friday, which it projects will save Americans over $1.5 billion in heating expenses per year. The updated ...

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. Rocket mass heater - Wikipedia

   en.wikipedia.org/wiki/Rocket_mass_heater

   The wood feed is the opening through which wood and air enter the system. In a J-tube design, the wood feed is a small and narrow opening that receives wood in a vertical orientation. [1] A wood feed is designed in a way that when wood sticks are inserted into the feed, only the bottom end of the sticks burn.