Definition
Single-phase immersion cooling submerges mining hardware in a tank of non-conductive dielectric fluid that absorbs heat but never changes state. The fluid stays liquid from start to finish: it picks up heat directly off the boards and chips, a pump pushes the warmed fluid to a liquid-to-liquid or liquid-to-air heat exchanger, and the cooled fluid returns to the tank in a continuous closed loop. Because nothing boils, the system runs at modest pressure and tolerates a wide range of fluids, which is why it dominates real-world Bitcoin mining deployments today.
Why it suits ASIC mining
The dielectric fluid contacts every surface of the board, so there are no hot spots and no fan noise. Operators commonly hold chip temperatures around 40-55°C instead of the 70-85°C typical of air cooling. Cooler silicon means less thermal throttling and longer hardware life, and the thermal headroom lets some operators push modest overclocks for extra hashrate. Mineral oils and synthetic hydrocarbons (such as the ElectroCool and Shell Diala families) are the usual choices because they are inexpensive, non-hazardous, and need only active circulation rather than condensers.
Trade-offs
The main cost is pumping energy and the bulk of the fluid itself, and untreated mineral oil can act as a solvent that lifts component labels over time. Maintenance is still simpler than two-phase systems: a board can be lifted, drained, and serviced without specialized condensing equipment. Heat rejection ultimately still flows to a dry cooler, cooling tower, or water loop, so site-level efficiency depends on the rest of the plant, not just the tank.
For the broader method this builds on, see Immersion Cooling and the fluids in Dielectric Fluid.
In Simple Terms
Single-phase immersion cooling submerges mining hardware in a tank of non-conductive dielectric fluid that absorbs heat but never changes state. The fluid stays liquid from…