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Example of Hydronic Wood Furnace            The Greenwood Hydronic Wood Furnace represents the latest innovation in wood burning boilers. Based on a tested design developed more than 20 years ago, the Greenwood wood boiler is the most efficient, wood burning boiler you can buy for your home. It is safe to operate, burns smoke- and creosote-free, and saves you up to 70% on your home heating bills. Our wood boiler is also easy on the environment -- the fuel you burn is a renewable resource and does not contribute to global warming. Finally, the Greenwood hydronic wood furnace is easy to install and works with a variety of heating systems and applications.




                         

          To understand why the Greenwood wood boiler "burns clean," it is helpful to understand how wood burns. Here's the scientific explanation... when you kindle a fire, the temperature accelerates to around 500 F at which point the wood begins to breakdown chemically and throw off volatile gases. These gases catch fire and accelerate the temperature to about 1100 F, at which point the wood solids begin to burn. If the temperature remains at or above 1100 F, the fire consumes all of the wood gases and solid materials, and you have a "clean burning" fire. If not, you have incomplete combustion, which means unburned gases and particulates are vented by the furnace. Some of it escapes out the chimney as smoke; the rest cools down and remains in the chimney in the form of creosote.


 Model

100

200

300

Rated Output (BTU/hour)

100,000 BTUH

200,000 BTUH

300,000 BTUH

Heating Capacity (SqFt)

1,800 - 5,000 SqFt

4,000 - 10,000 SqFt

9,000 - 15,000 SqFt



       

          Most wood burning furnaces and wood boilers on the market today are unable to sustain a temperature of 1100 F or higher. They are built with a firebox made of steel which is surrounded by a jacket of water. This water jacket serves two purposes: it transfers heat from the firebox to the home heating system, and it cools the steel firebox and keeps it from melting. The problem is, by keeping the firebox cool, the water jacket also cools the fire and prevents it from burning at temperatures needed for complete combustion. That's why these units produce irritating smoke and potentially dangerous creosote.

          Greenwood's hydronic wood furnace is built in an entirely different way. Our firebox is made of super-duty ceramic refractory, cast four to six inches thick, and surrounded by outer layers of insulation designed to keep the heat in. The natural draft system pulls air into the furnace which fans the flames and creates a roaring fire with sustained temperatures of 1800 to 2000 F. Heat from the fire is captured by a water tube heat exchanger located above the firebox in the path of the escaping superheated gases. The furnace extracts heat from these escaping gases, not the fire below.

          This innovative design enables the Greenwood wood boiler to burn cleanly and operate at a very high level of efficiency. By the time the escaping gases leave the furnace, they have cooled to around 300 F. The 1700 F difference in temperature between firebox and the vent represents the amount of energy captured to heat your home. The Greenwood hydronic furnace burns clean and delivers up to 85% of the wood's thermal energy to your home heating system.


      

  1. Unsplit logs (A) are loaded in the firebox and ignited with kindling and paper.

  2. As the fire grows, fresh air flows in through the air intake manifold (B), fanning the flames in the ceramic firebox. The gas reaches 2000 F before flowing out of the firebox and down the flame path toward the exhaust vent (C).

  3. As the superheated air moves toward the vent, its energy passes to a fluid flowing through an internal heat exchanger (D). The heat transfer fluid reaches 180 F before circulating to an external heat exchanger (E) mounted on the back of the furnace (heat exchanger shown is an optional add-on to the furnace). Here, energy produced by the furnace passes to the home heating system.

  4. Dual aquastats (F) control the operation of the furnace. One monitors the temperature of the heat transfer fluid and controls the damper on the air intake manifold (B). At the desired temperature, the damper closes, shutting off the flow of fresh air and extinguishing the fire. When more heat is needed, the damper opens and the furnace re-fires. Heat stored in the refractory walls of the firebox support automatic re-firing for up to two days. The second aquastat is wired to the home heating system so that it continues to run for a short time after the furnace shuts down and dissipates residual heat from the fire.

    


        

 Model

100

200

300

Rated Output (BTU/hour)

100,000 BTUH

200,000 BTUH

300,000 BTUH

Heating Capacity (SqFt)

1,800 - 5,000 SqFt

4,000 - 10,000 SqFt

9,000 - 15,000 SqFt

Boiler Dimensions (Width-Height-depth)

32" x 52" x 48"

42" x 52" x 48"

52" x 52" x 48"

Max Log Length (Feed door width)

18"

28"

38"

Max Log Diameter (Feed door height)

16"

16"

16"

Approx Weight

2,400lbs

3,000lbs

3,800lbs

Firebox Volume
(Width-Height-Depth)

19" x 32" x 24"
8.4 cubic feet

29" x 32" x 24"
12.9 cubic feet

39" x 32" x 24"
17.3 cubic feet



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