I found my booklet that goes with mine. It says they are thermostatically controlled and designed to come on at 45 degrees and turn off at 67 degrees. It says it will continually cycle to prevent freezing. Rated 13.5v DC 4.8 Amps and 65 Watts.
They are ThermaHeat brand name
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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