Open systems operate a furnace with direct contact occurring between the outside air and the water in the furnace. This allows oxygen to get into the system and create proper conditions for corrosion and excessive evaporation to occur.

The HEATMOR� bladder system allows little occurrence of evaporation and lessens the introduction of oxygen and other harmful elements. It also allows the use of antifreeze and other coolant enhancement chemicals. Under normal operating conditions, a HEATMOR� will operate at atmospheric pressure (3 psi or less). However, if a malfunction occurs (overheating) the specially designed pop-off valve will allow excess pressure to be relieved to the atmosphere.



How often do you clean out the ashes? | | Back to FAQs

The HEATMOR� over/under forced air draft makes our furnace more combustion efficient therefore, it produces a very fine ash. Approximately 5-8 gallons of these ashes can be safely and conveniently emptied out the rear of the furnace every 2-3 weeks. (Note: Use a noncombustible container for ash storage.)



How much wood will I use in a season? | | Back to FAQs

If you are a previous user of an indoor wood burning furnace or stove, normally your wood consumption with an outdoor furnace will increase approximately 10 percent due to the following reasons:

1. The HEATMOR� will become your primary heat source.
2. You will be heating your domestic hot water as well as other applications.
3. There will be a more even heat distribution.

However, you will no longer have the inconvenience and mess of hauling wood into your home as well as eliminating the smell of smoke in your home and the danger of chimney fires. For those of you that have not experienced the benefits of wood heating, you will find that your wood consumption will vary according to the type of wood you are burning (We recommend seasoned wood) and your individual heating requirements. On average you may use anywhere between 6-10 cords of wood per heating season.



Is this a cost effective method of heating? | | Back to FAQs

Yes! If you have your own wood lot, your fuel costs will be processing only. By using the Cost Comparison Chart below and your previous heating bills you can determine your future wood consumption and heating costs.

Cost Comparison Chart
The amount of heat created or used is measured in BTU’s. An average home uses 100,000,000 BTU’s of total energy for heating per year. This includes 25 percent usage for the heating of domestic hot water. Based on this total consumption, the following amounts of fuel would be required to produce 100,000,000 BTU’s.