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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. Furnace (central heating) - Wikipedia

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

    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 compared to a mid-efficiency forced-air or forced-draft furnace, is the ...

  4. Forced-air - Wikipedia

    en.wikipedia.org/wiki/Forced-air

    Like any other kind of central heating system, thermostats are used to control forced air heating systems. Forced air heating is the type of central heating most commonly installed in North America. [1] It is much less common in Europe, where hydronic heating predominates, especially in the form of hot-water radiators.

  5. Forced-air gas - Wikipedia

    en.wikipedia.org/wiki/Forced-air_gas

    High-efficiency condensing furnaces condense the water vapor (one of the by-products of gas combustion) and extract the latent heat to pre-heat the incoming furnace airflow, using a second heat exchanger. [2] This increases the efficiency (energy delivered into the building vs. heating value of gas purchased) to over 90%.

  6. Rocket mass heater - Wikipedia

    en.wikipedia.org/wiki/Rocket_mass_heater

    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. Due to the direction of the airflow, the fire burns sideways, toward the combustion chamber and the heat riser. The horizontal direction of the fire prevents smoke from escaping the wood feed to the environment.

  7. Condensing boiler - Wikipedia

    en.wikipedia.org/wiki/Condensing_boiler

    Condensing boilers are water heaters typically used for heating systems that are fueled by gas or oil. When operated in the correct circumstances, a heating system can achieve high efficiency (greater than 90% on the higher heating value) by condensing water vapour found in the exhaust gases in a heat exchanger to preheat the circulating water.

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