AFAIK there isn't any sensor, the filter guide is just based on the length of time it's been running (possibly factoring in the fan speed?)

How often it will need cleaning will ultimately depend on the environment. I was worried it might be prone to suck up dust / hair but it's far enough off the ground and the fans aren't so powerful that I don't think it's really an issue to worry about. I expect when it tells me the filter needs cleaning it probably won't and is just designed for worse-case environments.

The fans are kind of gentle, not like the kind on Bitmain or even a traditional fan-heater.

I've had a Mini running for about a week now and it's been great - decent amount of heat and hash rate (just under 41TH/s), and it's very quiet. Hopefully it will be reliable long-term. It's very "spouse friendly" because you can treat it as a heater and just set the temp you want.

These are desktop heaters, good for warming your hands if your office is cold. They won't put out anywhere near enough to heat a -20 garage, especially if 2xS19k Pros aren't enough.

Think of the wattage in relation to a traditional electric heater - they may be 1500w, so a 140w device isn't going to get close to the same amount of heat.

They do have both a web interface and the mobile app to use. AFAIK it only communicates with whatever mining pool you configure, but you can access the logs to see what it does.

This is an untapped market - the only options right now seem to be:

* Full power miners, needing 220v / 3000w, so unsuitable for normal homes
* Old miners capable of running on 110v residential power supplies (S9, S17, modified S19/S21 that are expensive)
* Tiny toy lottery miners that have little hash power and no heating capability

A mini heater consuming 800w and providing 40 Th/s would be awesome, and great for home use esp. for those of us in colder climates.