Softwarm, the Bitcoin mining heat company that posts as @SoftwarmLLC on X, has shared a build that uses Bitcoin miners as the core heat source for a building. The machines earn bitcoin while they run, and the heat they give off warms the floor instead of being blown outside.
According to Softwarm, the owner generates about $1.25 for every $1 spent on power at that location, with that system and in the current market. In plain terms, the heating pays for its own electricity and then some, as long as those conditions hold.
How the system works
Two Antminer S19 XP miners sit fully immersed in a Fog Hashing C2 tank filled with dielectric oil, a fluid that carries heat but not electricity. Bitmain rates the S19 XP at 140 TH/s and 3,010 W, so nearly all of that power ends up as heat in the oil.
A pump moves the hot oil through an oil-to-glycol heat exchanger and an external variable heat dump. The heat dump lets the miners keep hashing at full power on days the building needs less heat. Power is metered per machine, so the owner tracks each miner's draw in real time.
On the building side it is a conventional hydronic system: a glycol and water mix circulates through tubing laid in the floor and heats the concrete slab, which releases the warmth slowly into the space.
Why it matters for miners
Every watt a miner draws becomes heat. Most mining sites pay to get rid of it. Heat reuse flips that cost into value: the same kilowatt-hour that earns bitcoin also replaces fuel or electricity the building would have bought for heating. That is why small immersion setups like this one keep showing up in homes, greenhouses, workshops and commercial buildings.
Softwarm's numbers are specific to one site, one system and today's market. Hashprice, power rates and heating demand all move, and the result moves with them. Full details and photos of the build are in Softwarm's thread on X.
Heat reuse, immersion cooling and home mining are on the floor at Mining Disrupt 2027, March 22–24 at the Irving Convention Center in Dallas, where the companies building this hardware meet the operators buying it.