My Floor Heater Was Turning On w/o Permission!!

Device: Floor Heater
Make:
Model:
Estimated Savings:

After my the floor heater was detected, I started realizing it was turning on every day several times for about 5 min. Each time consuming ~1700 w.
I asked my roommate if he had turned it on – He denied. We have a control thermostat for the floor heater in each bedroom. But both were off!! And the Floor Heater turned on everyday without permission, making almost no change to the home temperature although it was using +20 a month. We turned off the breaker for it and started saving money. I live in San Diego, so it is warm enough to not need that year round.