it is a space heater that mines
not a miner that heats.
If treated that way it always earns money..Since you only use it when you heat or need heat.

If you consider it to be a miner that heats you do not want it.

If you read the example I gave of my friends office he could use it.

He does not control the heat
He does not control the ac

His place is too cold from lack of heat 5 or 6 months every year.
It is also too cold for 4 to 5 months from too much ac every year.

so for 9-11 months every year he used to use this

note image is from amazon of a delongi space heater:



he would set it to 600 or 1000 watts and run it for 9 to 11 months a year.  so 9 months is 9 x 720 = about 6500 kwatts lets round down to 6000 kwatts spent on wasted heat every year

if he spends 6000 kwatts on this gear none of that counts as power cost.

so that gear would be earning money in every year it works for the first 6000 kwatts it uses.

Do I think it is worth buying at 1800 no I don't I think I can build a quieter miner cheaper that cost less.

Since my friends off basically has 6000 kwatts of power for me to burn each year  I have been doing it for years. (2014-2019)