Greenwood Clean Energy

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Greenwood Clean Energy, Inc.
Industry Wood furnace
Wood boiler
Hydronic heating
Renewable energy
Founded 2009
Headquarters Redmond, Washington
Key people
Michael Kuehner, CEO
German Burtscher, EVP
Craig Butler, MD
Products Greenwood Frontier Series

Founded In 2009, Greenwood Clean Energy,Inc. is a privately held company located in Bellevue, Washington that manufactures wood and biomass central heating systems. In 2009, a team of entrepreneurs and industry veterans to develop and distribute woody-biomass fueled heating appliances for home and light commercial use.

In 2010, The Clean Energy Company, LLC (CEC) acquired the 'Greenwood' brand, certain assets and intellectual property of Greenwood Technologies. CEC then assumed the Greenwood name and became Greenwood Clean Energy, Inc and began marketing its appliances under the 'Greenwood' brand. Greenwood Technologies, LLC ceased operations in February 2009

In 2012, Greenwood launched the Frontier Series indoor wood boiler, a 3rd generation wood gasification system.


Greenwood is an advocate for responsible wood-burning, and has been participating with the U.S. Environmental Protection Agency and numerous state air quality agencies to encourage the use of more efficient wood boilers instead of the older dirty models. As an example, Greenwood Clean Energy's Frontier CX heating appliance meets the strict requirements for efficiency and emissions set forth in the Washington State Department of Ecology standards of less than 4.5 grams of particulate matter per hour using Douglas Fir test fuel.[2]

Product Lineup[edit]

Greenwood Frontier Series[edit]

The Greenwood Frontier Series, the inaugural product of Greenwood Clean Energy, is a 3rd generation wood gasification boiler. After a number of years in development, it went through extensive field testing and was made available was made available to the public in 2012. The inaugural model, the Frontier CX, incorporates technology and features that move beyond the traditional European approach -- a downdraft gasification wood boiler. Some of these unique attributes include: an updraft gasification system that provides a 'hearth-like' experience, a modulating induction fan (compared to a forced or natural draft system), and computer managed control system that continuously monitors boiler performance and uses a predictive control to ensure peak boiler operation.

The Greenwood Frontier Series is currently available in a single model capable of providing up to 120,000 BTU/hour.[3]

Greenwood Technologies Legacy Products[edit]

Greenwood Furnace Series (Greenwood Technologies)[edit]

This product is not available from Greenwood Clean Energy. It was launched in 2005 as an indoor wood furnace (residential use) designed to burn at sustained temperatures between 1800 and 2000 degrees Fahrenheit.

Aspen Series Outdoor Wood Furnace (Greenwood Technologies)[edit]

This product is not available from Greenwood Clean Energy. It is the outdoor version of the Greenwood Furnace Series. It was designed to replace the often-banned, traditional outdoor wood boilers.

Industry Recognition[edit]

Greenwood has received numerous awards from various organizations, publications, and expos, including the following:

  • 2008 Reader's Choice Award - CONTRACTOR Magazine[4]
  • 2008 Best Products: Efficiency - BUILDERnews Magazine[5]
  • 2007 Top Ten Online Products - Plumbing & Mechanical Magazine[6]
  • 2007 Brilliant Innovation Award - Discover Brilliant International Conference[7]
  • 2007 AHR Expo Innovation Award - AHR Expo[8]
  • 2006 Vesta Award: Groundbreaking Advancement in Renewable Fuel Heating - Hearth and Home[9]