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WOODMASTER OUTDOOR FURNACES • OWNER'S MANUAL
4. Poor water quality - Water with high amounts of solids, sand or dirt can
cause frequent pump failure. Use softened and/or filtered water.
E . ERRATIC TEMPERATURE READING ON GAUGE
1. Return water too cold - Water circulation may be too slow. The return
water should be no more than 20°F-25°F less than the hot supply water.
If the water returning to the outdoor furnace is too cold, it may cause
erratic temperature readings. Check for partial air lock or install larger
pump.
F . BURNING AN EXCESSIVE AMOUNT OF WOOD
1. High volume water heating - High volume water heating (e.g., car wash,
swimming pool, etc.) will require high wood consumption.
2. Excessive heat loss - See Building is Losing Temperature section.
3. Air entering through door - See item 1 of Outdoor Furnace is
Overheating.
4. Excessive draft - If a very tall extension is added to the chimney,
the increased draw through the draft may cause excessive wood
consumption. Decreasing the draft opening may increase efficiency
and reduce wood consumption.
5. Supply and return line heat loss - If supply and return lines are buried
in a wet, low-lying area, there may be a large heat loss which would
greatly increase wood consumption.
5. High heat demand - Concrete slabs (with radiant heat) that are poorly
insulated or are exposed to water or cold outside temperatures will
require increased wood consumption (see Hydronic Installations
section). Bringing a concrete slab up to temperature the first time
will take a considerable amount of time and wood; once warm,
wood consumption will be reduced if the concrete slab and building
are insulated properly. The following will also have a high heat
demand: poorly insulated buildings, buildings with large amounts of
glass windows/doors, buildings with overhead doors, greenhouses,
uninsulated crawl spaces, outdoor air infiltration and air leaking through
foundation.
