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How do Warmup thermostats work?

4iE Smart WiFi Thermostat

Warmup thermostats heat in waves for highest efficiency.

At the time set to turn on, the thermostat turns on at 100% until it hits the target temperature. Once there, the thermostat completely shuts off until it drops below a few degrees. Once down a few degrees from the target, it turns back on at 100% because the heating cables connected to the thermostat are constant wattage wire

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