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The following are general guidelines for wood selection:
Keep wood covered but open to the wind 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 to dry out wood.
Too low of moisture content (very dry, old wood) burns rapidly and inefficiently.
F. Burning Coal
As a general rule, coal is more difficult than wood to burn. If you are primarily burning coal, adapter grates can be
purchased from Nature’s Comfort that will sit in place of the center firebrick(s). For best results coal should be piled 6-
10” deep and mixed with wood to help the air pass through. To shake and settle a bed of coals, use a hoe or a rod
with a hook on the end to place in a slot on the grate to then rock back and forth.
G. Heating the Home
The NCB 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 Nature’s Comfort outdoor boiler can also be connected to any existing hydronic radiant heating system that
operates at 180 degrees or less using a plate heat exchanger.
H. Heating Domestic Hot Water
To heat your domestic water, heated water from the outdoor boiler is circulated through a “water to water” heat
exchanger which must be installed on your existing water heater. This is either a plate or side-arm style heat
exchanger. The hot water from the boiler usually goes to the exchanger on your furnace and then to the exchanger at
your water heater. You may use either style exchanger with your water heater. See page 19 for a layout of piping for
a sidearm.
I.
Thermostat Controls
The only visible addition to the heating system inside your home is a second thermostat, which should be located near
the existing thermostat. This second thermostat must be installed to operate your existing blower for forced air or
your circulation pump for radiant heat and needs to be set higher that your original thermostat by 10 degrees so your
existing furnace will automatically take over to maintain your household temperature if your boiler is not running.
Please see page 18 & 19 for an example wiring layout.
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