Definition
Immersion Tank is the sealed vessel that holds the non-conductive (dielectric) fluid in which an ASIC miner is fully submerged for cooling, replacing the fans and open air of a conventional rig with a bath that carries heat away by direct liquid contact.
Also known as: immersion vat, dielectric bath, single-phase cooling tank.
What an Immersion Tank Actually Is
An immersion tank is the physical container at the heart of an immersion-cooling setup. The miner sits inside it, completely covered by a thermally conductive but electrically insulating fluid, most commonly a synthetic or mineral-derived oil. Because the fluid touches every hashboard, ASIC chip, and component directly, heat leaves the silicon far more efficiently than it does through air-cooling, where it first has to pass through a heatsink and then into moving air.
Most tanks are single-phase: the fluid stays liquid the whole time, gets warmed by the hardware, and is pumped through an external heat exchanger before circulating back. The tank itself is rarely the whole story. It works alongside a pump, a radiator or dry cooler, and sometimes a reservoir, but the tank is the part that defines the form factor and how many miners you can submerge at once.
Why the Tank Changes How the Miner Behaves
Submerging a miner is not just a plumbing decision. It changes how the firmware should run the machine. In a tank there are no spinning fans to remove, the fluid removes heat far more aggressively, and the safe operating envelope shifts. Bitmain ships dedicated immersion variants for exactly this reason, the S21 XP Immersion built on the BM1370 chip being a current example, and their firmware carries separate immersion power-profile tables tuned for the wetter, cooler environment.
An open custom firmware stack treats an immersion tank as a distinct cooling mode. That mode typically disables the fan-failure and fan-RPM checks that would otherwise shut a fanless, submerged board down, raises the temperature limits, and re-reads the per-board temperature sensors (the TMP75-class chips on each hashboard, read over I2C) against a new threshold set. Thermal protection still applies: as the fluid and silicon warm, firmware throttles by stepping the chip frequency down in small increments, and a hard limit still trips a board shutdown to protect the hardware. The cooler, more stable thermals a tank provides are also what make sustained overclocking realistic, since the silicon is no longer fighting hot, recirculated air.
Why a Home or Small-Scale Miner Cares
For a sovereign miner, the immersion tank is the bridge between hashing and useful heat. The fluid that absorbs your miner’s wattage is hot, and that heat is easy to recover. Hobbyists and small operators have plumbed tank loops into hot tubs, radiant floors, and domestic water heaters, turning the tank into both a cooler and a heat-recovery appliance. Projects like Fog Hashing have heated entire homes this way, which fits squarely into the broader space-heater-mining and dual-purpose-mining movement.
A tank also tames the loudest problem with running ASICs at home. With the fans gone, a submerged miner is almost silent, which is a major reason residential-mining setups reach for immersion despite the added cost and mess. The trade-offs are real, though. A tank means fluid to buy and maintain, sealing and leak risk, voided warranties on machines that were not sold as immersion units, and the chore of pulling a dripping miner out for service. For a single Bitaxe or one S19-class box, the complexity usually is not worth it; for a denser home Hashcenter where heat and noise are the binding constraints, the math starts to favor the tank.
If you are weighing whether a submerged build fits your space and power, it helps to compare miner thermal designs and firmware behavior side by side before committing fluid. You can study hardware options on the miners catalog and how different tuning stacks handle immersion mode on the firmware comparison page.
Related terms: Immersion Cooling, Air Cooling, Heat Recovery, Space Heater Mining, Overclocking, Temperature Sensor
In Simple Terms
A sealed container of cooling fluid for silent mining. Eliminates fans and enables overclocking.
Immersion Tank is the sealed vessel that holds the non-conductive (dielectric) fluid in which an ASIC miner is fully submerged for cooling, replacing the fans and open air of a conventional rig with a bath that carries heat away by direct liquid contact.
Also known as: immersion vat, dielectric bath, single-phase cooling tank.
What an Immersion Tank Actually Is
An immersion tank is the physical container at the heart of an immersion-cooling setup. The miner sits inside it, completely covered by a thermally conductive but electrically insulating fluid, most commonly a synthetic or mineral-derived oil. Because the fluid touches every hashboard, ASIC chip, and component directly, heat leaves the silicon far more efficiently than it does through air-cooling, where it first has to pass through a heatsink and then into moving air.
Most tanks are single-phase: the fluid stays liquid the whole time, gets warmed by the hardware, and is pumped through an external heat exchanger before circulating back. The tank itself is rarely the whole story. It works alongside a pump, a radiator or dry cooler, and sometimes a reservoir, but the tank is the part that defines the form factor and how many miners you can submerge at once.
Why the Tank Changes How the Miner Behaves
Submerging a miner is not just a plumbing decision. It changes how the firmware should run the machine. In a tank there are no spinning fans to remove, the fluid removes heat far more aggressively, and the safe operating envelope shifts. Bitmain ships dedicated immersion variants for exactly this reason, the S21 XP Immersion built on the BM1370 chip being a current example, and their firmware carries separate immersion power-profile tables tuned for the wetter, cooler environment.
An open custom firmware stack treats an immersion tank as a distinct cooling mode. That mode typically disables the fan-failure and fan-RPM checks that would otherwise shut a fanless, submerged board down, raises the temperature limits, and re-reads the per-board temperature sensors (the TMP75-class chips on each hashboard, read over I2C) against a new threshold set. Thermal protection still applies: as the fluid and silicon warm, firmware throttles by stepping the chip frequency down in small increments, and a hard limit still trips a board shutdown to protect the hardware. The cooler, more stable thermals a tank provides are also what make sustained overclocking realistic, since the silicon is no longer fighting hot, recirculated air.
Why a Home or Small-Scale Miner Cares
For a sovereign miner, the immersion tank is the bridge between hashing and useful heat. The fluid that absorbs your miner's wattage is hot, and that heat is easy to recover. Hobbyists and small operators have plumbed tank loops into hot tubs, radiant floors, and domestic water heaters, turning the tank into both a cooler and a heat-recovery appliance. Projects like Fog Hashing have heated entire homes this way, which fits squarely into the broader space-heater-mining and dual-purpose-mining movement.
A tank also tames the loudest problem with running ASICs at home. With the fans gone, a submerged miner is almost silent, which is a major reason residential-mining setups reach for immersion despite the added cost and mess. The trade-offs are real, though. A tank means fluid to buy and maintain, sealing and leak risk, voided warranties on machines that were not sold as immersion units, and the chore of pulling a dripping miner out for service. For a single Bitaxe or one S19-class box, the complexity usually is not worth it; for a denser home Hashcenter where heat and noise are the binding constraints, the math starts to favor the tank.
If you are weighing whether a submerged build fits your space and power, it helps to compare miner thermal designs and firmware behavior side by side before committing fluid. You can study hardware options on the miners catalog and how different tuning stacks handle immersion mode on the firmware comparison page.
Related terms: Immersion Cooling, Air Cooling, Heat Recovery, Space Heater Mining, Overclocking, Temperature Sensor