7
WOODMASTER OUTDOOR FURNACES • OWNER'S MANUAL
Digging the Trench
Before digging, be sure to call for utility locator service .
The trench depth for ThermoPEX should be between 10" and 28" (25 and 71
cm).
NOTE: Do not backfill the trench until the supply and return lines have been tested to
ensure there are no leaks .
Underground Electric Wire
A 14-2 (two wires plus ground) underground rated wire should supply the
outdoor furnace with electricity (for the 6500, use 12-2 plus ground). A
heavier gauge wire may be needed if the run is over 200 feet (61 meters).
Check local codes and requirements. It is recommended that the incoming
fuse or circuit breaker not exceed 15 amps.
ThermoPEX
®
Advantage
ThermoPEX is flexible pre-
insulated piping that is ideal
for use with outdoor wood
furnaces. ThermoPEX consists
of two 1-inch* oxygen barrier
PEX
®
lines, two 1-1/4 inch**
oxygen barrier PEX lines, or
two 25mm*** oxygen barrier
PEX lines (a supply and a return
line). The lines are insulated
with high-density urethane
insulation and a thick, durable,
waterproof polyethylene outer
jacket. Thermal expansion is
absorbed within the system
because the PEX lines, urethane
insulation and the durable
outer jacket are cast together.
The corrugated design allows
flexing for easier installation.
ThermoPEX is a proven product
and maintenance-free.
*CTS ASTM 1" supply and return.
**CTS ASTM 1-1/4" supply and return.
***CTS ASTM 25mm supply and return.
