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K Factors of Alternate Materials:
Material K Required Thickness
Ceroform 126 .21 1/8”
Limestone 8.0 3.2”
Concrete 8.0 3.2”
Sandstone 13.0 5.2”
Marble 18.0 7.2”
Hearth extension or floor protector thickness above four (4) inches is generally not acceptable due to cost, floor
load capacity, and look. The alternate we recommend is using Ceroform No. 126 millboard 1/8” thick minimum
and putting any type decorative brick or stone (any thickness) on top of it.
*The K* factor represents the thermal conductivity of a material and is the time rate of heat flow through a
homogeneous material under steady-state conditions, through unit area, per unit temperature gradient in the
direction perpendicular to a surface
.
9. The next step is the electrical installation. NOTE: An electrician must wire the ZC20 into the home wiring
system using No. 15 AWG (with ground wiring) as minimum in accordance with local wiring codes.
CAUTION: Stove is plugged into cabinet receptacle.
A. Remove brass trim.
B. Remove top panel and right side panel.
C. Now an electrician must do the wiring.
9. Now, finish the wall around the ZC20 using brick, rock, sheetrock, paneling, or any type finishing material.
CAUTION: Do not block any openings designed into the unit.
10. Install a mantel above the unit if desired. Note that a combustible mantel must be positioned at least 12” above
the top of the ZC20 cabinet.
11. The ZC20 and Model 20 fireplace are now ready for use. Refer to the Model 20 owners manual for operation,
safety, and chimney maintenance. Refer to the back of this manual for ZC20 warranty registration information.
FIGURE 11 POWER HOOK-UP
TOP FRONT TRIM PANEL
BRASS TRIM
RIGHT
SIDE TRIM
PANEL
BLACK
WHITE
GROUND
REAR COVER PLATE
RECEPTACLE BOX
HEATER POWER CORD