Designed to work with single-stage heating systems only is the Emerson 1C20-102 thermostat. It is mercury free and has snap action contacts and a temperature range of 50-90 degrees F. It's easy to operate and has low voltage mechanics.
Mercury-free mechanical thermostat
For use on single-stage heat only systems
Features rugged snap-action contacts， adjustable heat anticipator and bimetal thermometer
Terminals: R， W
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