Newmac WAO E, Installation, Operating And Service Manual

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WOOD IS A SAFE, CLEAN AND ECONOMICAL FUEL
Species Approx. Wt BTU per Air Equivalent Value #2 Cost @ Cost @ Cost @
Per Cord Dried Cord Heating Oil Litre .80 ¢ 1.00 1.25
$ $ $
Hickory 3595 30,600,000 827.4 579.18 827.4 1034.25
Hard Maple 3075 29,000,000 784.6 549.22 784.6 980.75
Beech 3240 27,800,000 752.4 526.68 752.4 940.50
Red Oak 3240 27,300,000 738.7 517.09 738.7 923.38
Yellow Birch 3000 26,200,000 709.2 496.44 709.2 886.50
Elm 2750 27,800,000 662.8 463.96 662.8 828.50
Soft Maple 2500 24,000,000 649.2 454.44 649.2 811.50
Tamarack 2500 24,000,000 649.2 454.44 649.2 811.50
Cherry 2550 23,500,000 635.5 444.85 635.5 794.38
Ash 2950 22,600,000 611.4 427.98 611.4 764.25
Spruce 2100 18,100,000 490.1 343.07 490.1 612.63
Hemlock 2100 17,900,000 484.1 338.87 484.1 605.13
Aspen 1900 17,700,000 483.2 338.24 483.2 604.00
White Pine 1800 17,700,000 462.8 323.96 462.8 578.50
Basswood 1900 17,000,000 459.6 321.72 459.6 574.50
**To change liters into US gal., multiply by .264.
For the least amount of wood handling, the wood with the highest heat content is most desirable.
An open fireplace can actually refrigerate a house because it sucks in so much cold air that is only
partially used for combustion. A carefully designed fireplace makes use of perhaps 10-15% of the heat
available: most still going up the flue. The well-constructed potbellies get perhaps 20-25% and the
automatic draft regulated, tightly sealed wood heaters get perhaps 50%.
Notice that the percentages efficiency goes up as the combustion process becomes more and more
controlled. The roaring fire is a complete waste of fuel. The best situation is one where the combustion
chamber is gas-tight. This allows a controlled fire that toasts the wood and puts the right quantity of wood
gas in the right place and at the right temperature for optional combustion and heat transfer.
The NEWMAC WOOD FURNACE toasts the wood to charcoal and the charcoal burns to dust leaving a
minute amount of residue. From the above heat values, it can be seen that a cord of Hickory wood is
equivalent to $661.92 (@ 89.0¢ liter) worth of oil, over twice as much as you would pay for a cord of
wood.
Without taking into account all the free wood that is available. EFFICIENT WOOD HEATING cuts your
heating costs in half.