Nature's Comfort AAA Outdoor Boiler Installation And Operating Instructions Manual - page 9
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E. Wood Recommendations
For maximum efficiency and burn times, you should only burn wood that has been seasoned for 12-24
months and sheltered from rain and snow. Burning unseasoned wood is wasteful and inefficient. Freshly
cut, “green” wood uses much of the combustion energy to dry out the excess moisture. Ideally the wood
should be split in 6-8” diameter pieces to aid in seasoning and should be around 20% moisture content by
weight. Whole rounds burn well and are cheaper, but this type of wood also will have to be dried much
longer, especially if in larger diameters.
The following are general guidelines for wood selection:
Keep wood open to the wind but covered as rain and snow will greatly hamper the seasoning.
Hardwoods burn longer than softwoods as they are denser and have more available BTU’s.
Larger pieces burn longer than small pieces but take longer to season properly.
20% moisture content is optimum.
Wood with higher moisture content wastes energy when burning to dry out wood.
Too low of moisture content (very dry, old wood) burns rapidly and inefficiently.
F. Heating the Home
The AAA boiler is designed to save energy and provide the most comfortable heating available. It
heats your home by heating a firebox surrounded by a steel tank filled with water. The boiler is a non-
pressurized boiler with an atmospheric vent. The hot water is then circulated through underground pex
pipes to a water coil (heat exchanger) installed inside your existing central duct system. (Typical of
most systems)
A typical water-to-air heat exchanger much like a small
radiator or heater core in a car is installed in your ductwork.
When air blows through it, heat is extracted and hot air blows
out of your vents.
The AAA outdoor boiler can also be connected to any existing radiant heating system that operates at
180 degrees or less using a plate heat exchanger. When connecting directly to an in-floor heating
system, be sure to use a mixing valve to keep temperatures below the maximum rating of your system
(usually 110F).