Hey there, no one is asking you to buy anything and, as a matter of fact, your reaction is exactly what we were hoping to elicit. This isn't a scam, its a working device that heated my 1100sf apartment over the New York winter while it was mining Doge and folding for Stanford during testing.
This is a scam in the same way solar roadways is a scam. It is a neat idea that doesn't make sense economically.
As for the technical questions, here's a shot: what will it do when the room is heated, it'll heat water for your shower, what will it do when the room and your water is heated, it'll run your refrigerator. What will it do when your water is heated, your refrigerator is cold and the house is too hot - it'll regenerate (heat) a desiccant air conditioning system and cools the house.
How much do you expect a modified refrigerator/air conditioner would cost/save? I really doubt you will recycle enough energy to justify the costs whatever they may be.
You might be able to save a few hundred dollars if you heated your water tank for a year using an asic, but your contraption cost would probably negate those savings. Not many people mine for more than a few months and those who do have very low electricity costs which makes recycling pointless.
The real savings would come from space heating but you don't need a rube goldberg machine for that.
The economic model - your a whiz, maybe this will make sense: instead of spending 60% of the energy bill in a data center somewhere cooling the machines think about moving the machines to where there is a need for heat
Ignoring the fact that most modern datacenters use ~10-30% for cooling and that converting all their air cooled hardware to water cooled would cost an obscene amount of money, how do you plan on moving several hundred KW worth of heat from a datacenter to a place that needs it?
I don't doubt it can be done but I really doubt it can be done cost effectively.
The cool (figuratively speaking) part is, now you aren't paying an gas/electric bill (or a portion at least) just to heat your house/water/etc
The question is what portion? Have you done calculations on how much electricity you might be able to recycle? I'd love to see a cost/savings breakdown.
Do you think this might extend the payback of the mining rig a bit when you offset the roughly 3k a year the average residence spends a year to heat or cool water/space in your house? Do you think it makes even more sense since you are no longer running the AC to cool the miner... like the data centers do 24/7? There is a pony in there... think it over. Talk about an absurd idea, sticking a miner in your house and turning on the AC to keep it cool was one of the most absurd ideas of all - yet how many people were doing that last year?
But if 90% of that energy is spent on space heating, why not use a $25 heatsink+fan instead of a $300 rube goldberg machine and another ~$1000 for a modified AC+refrigerator?
Basically you can recycle ~$2700 without modifying your hardware by space heating, or you can spend an extra ~$300 to save $3000(~$300 extra) by incorporating water heating.