Therma-Coil Therma-coil User Manual - page 3
Therma-coil is manufactured in two sizes
depending on the stove size and the amount
of hot water needed. Smaller stoves tend to
have a higher firebox temperature and gener-
ally are better suited to the single U-shaped
model. Larger fireboxes need more surface
area and generally work best with the W-
shaped model. Climates that use woodstoves
all the time throughout long winters will see
more hot water produceded in a Therma-coil
than milder areas with intermittent stove use
and should be sized accordingly. Measure the
inside of the stove to determine which coil
will fit, remembering that the Therma-coil is
16” long inside the stove with an additional
5” threaded nipple length that exit through
the stove wall (overall length is 21”).
Therma-coil placement inside the stove also
determines sizing. The coil can be placed in-
side the firebox vertically along the side or
the rear of the stove exiting out the rear or
side stove wall. However, this usually takes
up firebox space, can get covered with ashes
that are pushed up and reduce performance,
and is more prone to being hit with logs.
When possible, it is recommended the coil
be placed high inside the stove, horizontal-
ly under the griddle and out of the way of
logs. Therma-coil will capture some of the
heat escaping up the flue in this location. In-
creasing the amount of hot-water at a later
date can be accomplished by adding another
Therma-coil and plumbing it in series with
the first one. In most cases, the heat needed
for domestic water heating will not affect the
burn characteristics of the stove.
What Size?
Placement
6 1/4”
10 1/4”
U-Coil
W-Coil
21”
5” thread
5”
5”
9”