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It's been done. Space heaters are like 200 bucks. Hard to compete with that.

Space heaters are $20* at Walmart for basically as much energy draw as a typical household socket can handle.

Mining hardware is really expensive still, and they are constantly replaced by better models.

I have a massive surplus of solar in summer, and on my local auction sites some old miners became available. I considered picking them up and putting them to use using up my surplus "free" electricity.

I gave up when the mining ROI calculation came back with multiple years, even when you factor in a $0 electicity cost.

This might've worked 3-5 years ago (maybe more), but I don't see that happening now to be honest.

There are already such products, just search for "bitcoin heater" .