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WOODMASTER OUTDOOR FURNACES • OWNER'S MANUAL
Supply and Return Lines
Determine the configuration of the supply and return lines from the outdoor
furnace to where the supply and return lines will connect to the existing
heating system. WoodMaster recommends using the ThermoPEX® piping
system.
ThermoPEX is a fully assembled, pre-insulated piping system consisting of
two 1" Central PEX lines or two 1-1/4" PEX lines. The two lines (one a supply
and one a return line) are insulated with high-density urethane insulation
and a thick, durable, waterproof, polyethylene outer jacket. One of the lines
is marked with a black stripe for identification.
NOTE: To prevent ground water from entering the house, do not use drain tile, PVC
pipe with bubble wrap, or any other inferior material for insulating the water lines .
NOTE: If the outdoor furnace supply and return lines are not insulated properly, or if
other brands of insulated piping are used, there can be excessive heat loss . This heat
loss can greatly increase the fuel consumption .
NOTE: If it is unavoidable that the trench will run through an area of ponding water, use
ThermoPEX instead of other materials . ThermoPEX should also be used for above-
ground or winter installations, and if the area is likely to be affected by compaction .
Temporary Above Ground or Winter Installations
For temporary above ground or winter installations in which the supply
and return lines can not immediately be buried underground, WoodMaster
recommends using ThermoPEX. Be sure that both the insulation and
the supply and return lines will not be exposed to ultraviolet rays. The
ThermoPEX exterior jacket has UV protection but the insulation and water
lines inside do not. Use a ThermoPEX termination cap at each end of the
installation to protect and seal the insulation from water.
NOTE: Bury the ThermoPEX as soon as conditions permit (e .g ., once the ground has
thawed) .
NOTE: If ThermoPEX is installed temporarily above ground, provisions should be made
to prevent possible risk of fire coming into contact with the ThermoPEX. ThermoPEX
is constructed of materials that can burn and transfer a fire.
CAUTION
If ThermoPEX is installed temporarily above ground, do not cover with combustible
materials (e .g ., straw, hay, leaves, etc .) .
