Heater = simple resistor with some protection for people don't get toasted. Super simple and cheap to produce.
Mining ring = computers with lots of hard to produce, failure prone and expensive components, like gpus and ASICs.
So you agree with me. If electrical "mining" heaters can't be made cheap, reliable and easy enough, then there would be no economic advantage to using one in place of a simple electric heater so then they won't be used.
I think only people already prone to buy miners would consider using then also as heaters
If the mining-heaters
can be made cheap, reliable and simple such that using them saves money, then of course people would install them. Do you think the average person knows how a heat pump works?
It all comes down to what is most cost effective.
I have no interest in hand-waving debates about "what will be most cost effective in various scenarios at some distant point in the future" as we'll both likely be wrong.