This 7.5” diameter by 0.05” thick circular dew heater pad fits between an 8” reflector’s primary mirror and its mirror cell. The pad is made of two sheets of rubberized fabric cemented together. Imbedded between the sheets is a heater element made of a single thin strand of nichrome wire many feet long. The wire is laid in a maze-like pattern so that it warms the entire surface of the heater pad. Since the pad is in direct contact with the back of the primary mirror, the warmth of the heater element is transmitted very effectively into the mirror. The result is that you need less energy to keep your mirror dew-free. The heater pad draws 1.6 amps at full power (power consumption at normal operating levels will generally be 40% to 60% less, as the normal standard controller setting is medium to low). It has a permanently attached 4’ power cord terminated by a male RCA plug for connection to the heater control unit.
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