What is this mystery heat 4?

The property is a short-term rental. This device was last on Sep 23rd 7pm to Sep 24th 6am when we had guests. Our cleaner was there Monday and at the 5pm hour it turned on. Tuesday and now today it turns off at the 7am hour. I suspect that it will turn on again at the 11am hour like it did yesterday.

It was only on in Aug and June before this. I have the cleaner coming back to check the stove and all appliances. Any suggestions?

Assuming the bottom screenshot is your overall whole house Power Meter, not the Power Meter for just device Heat 4, but the top from just Heat 4 ?? Sense doesn’t label the views with “Main” or with device name so it’s helpful to tell us which view you are posting. I guess this because the top screenshot show a steady usage of 200W (0.2 kWh / h), while the bottom one shows as spike of 5000W or so.