Definition
Immersion cooling is a thermal management method where mining hardware is fully submerged in a thermally conductive but electrically non-conductive (dielectric) fluid that absorbs heat directly from every component. Instead of pushing air across heatsinks with fans, the fluid carries heat away from the ASIC chips, voltage regulators, and PCBs, then dumps it into a heat exchanger.
For ASIC miners this is a meaningful shift in how heat leaves the machine. In a stock air-cooled unit, two or four high-RPM fans force air over the heatsinks bonded to each hashboard. In immersion, those fans are removed or disabled entirely and the whole machine sits in a tank of dielectric fluid. Because the fluid contacts the chip packages and surrounding components far more uniformly than moving air ever can, hot spots shrink, thermal gradients across a board flatten out, and the dust ingress that kills air-cooled gear over time is eliminated. The trade-offs are real: tanks, pumps, plumbing, fluid, and a heat-rejection loop add significant up-front cost and operational complexity compared with simply plugging a miner into a wall and a circuit.
Single-phase vs two-phase immersion
Two broad approaches exist. In single-phase immersion the dielectric fluid stays liquid the entire time; pumps circulate it past the hardware and through a heat exchanger. In two-phase immersion the fluid is engineered to boil at a low temperature directly against the hot components, and the rising vapour condenses on a cooled coil before dripping back into the bath. Single-phase is the more common, lower-complexity route for most operations; two-phase offers very efficient heat transfer but uses more specialized and costly fluids. In both cases the fluid must be genuinely dielectric so that submerging powered electronics does not short anything out.
Firmware has to know it’s underwater
Running an ASIC in fluid is not just a hardware change — the firmware behaves differently in an immersion configuration. Reverse-engineering of widely deployed ASIC firmware shows that an explicit immersion or “cooling mode” setting changes several control behaviours at once:
- Fan logic is disabled. With no fans present, the firmware stops using fan speed as a temperature actuator and suppresses fan-failure alarms that would otherwise halt the machine.
- Temperature thresholds rise. Because fluid transfers heat more effectively and more evenly than air, higher chip-temperature limits are permitted before protection kicks in.
- Cooldown timing shortens. Liquid dissipates heat faster than air, so post-event cooldown periods are reduced (capped in the low single-digit minutes rather than dragging on).
- Extra headroom unlocks. Higher-frequency presets that would trip thermal throttling on air can be sustained, because the better heat path keeps the chips inside their safe envelope.
This is why aggressive tuning and immersion are so often paired. Firmware feature documentation lists discrete cooling modes — air, immersion, and a related hydro (water-block) mode — and the immersion path generally exposes a wider, higher-power envelope than the others. Some Antminer power-profile tables ship with an explicit immersion marker alongside their standard performance and normal presets, signalling that the model supports a higher power ceiling when run in fluid.
Why miners reach for it
The practical wins line up with the physics. Removing fans makes the machine effectively silent, which matters enormously for home and residential setups where fan noise is the dealbreaker. Sealing the electronics in fluid stops dust and airborne contaminants from accumulating on boards, removing one of the most common slow-failure modes in air-cooled fleets. The uniform, high-capacity heat path is also what makes safe sustained overclocking realistic rather than a gamble. For larger sites, dense tanks and waste-heat capture make immersion attractive where space, acoustics, and heat reuse all matter at once.
It is not free of risk. Fluid can damage hardware if the wrong (non-dielectric) liquid is used, if components are not rated or prepared for submersion, or if fluid migrates where it shouldn’t. Prepping a miner for fluid often means more than flipping a firmware setting — fan assemblies and certain materials may need to be addressed first. Immersion does not change a chip’s fundamental efficiency either; it changes the thermal limits you can operate within, which is a different lever from raw joules-per-terahash on the silicon itself.
Where it fits at D-Central
Immersion sits at the high-effort, high-control end of the cooling spectrum. If you’re weighing it against the stock approach, start by understanding the baseline it replaces in air cooling, and how the silent-running advantage maps to the noise level (dB) profile of your site. Because immersion concentrates heat into a single fluid loop rather than spreading it across each hashboard heatsink, it pairs naturally with the kind of careful tuning D-Central specializes in.
If you’re planning an immersion build or just deciding whether the complexity is worth it for your hardware, browse the rigs and components in the D-Central shop and reach out — matching the right miner and configuration to your cooling strategy is exactly the kind of decision we help Canadian miners get right before the fluid goes in the tank.
In Simple Terms
Submerging mining hardware in non-conductive liquid for silent, efficient cooling. Eliminates fans and dust.
Immersion cooling is a thermal management method where mining hardware is fully submerged in a thermally conductive but electrically non-conductive (dielectric) fluid that absorbs heat directly from every component. Instead of pushing air across heatsinks with fans, the fluid carries heat away from the ASIC chips, voltage regulators, and PCBs, then dumps it into a heat exchanger.
For ASIC miners this is a meaningful shift in how heat leaves the machine. In a stock air-cooled unit, two or four high-RPM fans force air over the heatsinks bonded to each hashboard. In immersion, those fans are removed or disabled entirely and the whole machine sits in a tank of dielectric fluid. Because the fluid contacts the chip packages and surrounding components far more uniformly than moving air ever can, hot spots shrink, thermal gradients across a board flatten out, and the dust ingress that kills air-cooled gear over time is eliminated. The trade-offs are real: tanks, pumps, plumbing, fluid, and a heat-rejection loop add significant up-front cost and operational complexity compared with simply plugging a miner into a wall and a circuit.
Single-phase vs two-phase immersion
Two broad approaches exist. In single-phase immersion the dielectric fluid stays liquid the entire time; pumps circulate it past the hardware and through a heat exchanger. In two-phase immersion the fluid is engineered to boil at a low temperature directly against the hot components, and the rising vapour condenses on a cooled coil before dripping back into the bath. Single-phase is the more common, lower-complexity route for most operations; two-phase offers very efficient heat transfer but uses more specialized and costly fluids. In both cases the fluid must be genuinely dielectric so that submerging powered electronics does not short anything out.
Firmware has to know it's underwater
Running an ASIC in fluid is not just a hardware change — the firmware behaves differently in an immersion configuration. Reverse-engineering of widely deployed ASIC firmware shows that an explicit immersion or "cooling mode" setting changes several control behaviours at once:
- Fan logic is disabled. With no fans present, the firmware stops using fan speed as a temperature actuator and suppresses fan-failure alarms that would otherwise halt the machine.
- Temperature thresholds rise. Because fluid transfers heat more effectively and more evenly than air, higher chip-temperature limits are permitted before protection kicks in.
- Cooldown timing shortens. Liquid dissipates heat faster than air, so post-event cooldown periods are reduced (capped in the low single-digit minutes rather than dragging on).
- Extra headroom unlocks. Higher-frequency presets that would trip thermal throttling on air can be sustained, because the better heat path keeps the chips inside their safe envelope.
This is why aggressive tuning and immersion are so often paired. Firmware feature documentation lists discrete cooling modes — air, immersion, and a related hydro (water-block) mode — and the immersion path generally exposes a wider, higher-power envelope than the others. Some Antminer power-profile tables ship with an explicit immersion marker alongside their standard performance and normal presets, signalling that the model supports a higher power ceiling when run in fluid.
Why miners reach for it
The practical wins line up with the physics. Removing fans makes the machine effectively silent, which matters enormously for home and residential setups where fan noise is the dealbreaker. Sealing the electronics in fluid stops dust and airborne contaminants from accumulating on boards, removing one of the most common slow-failure modes in air-cooled fleets. The uniform, high-capacity heat path is also what makes safe sustained overclocking realistic rather than a gamble. For larger sites, dense tanks and waste-heat capture make immersion attractive where space, acoustics, and heat reuse all matter at once.
It is not free of risk. Fluid can damage hardware if the wrong (non-dielectric) liquid is used, if components are not rated or prepared for submersion, or if fluid migrates where it shouldn't. Prepping a miner for fluid often means more than flipping a firmware setting — fan assemblies and certain materials may need to be addressed first. Immersion does not change a chip's fundamental efficiency either; it changes the thermal limits you can operate within, which is a different lever from raw joules-per-terahash on the silicon itself.
Where it fits at D-Central
Immersion sits at the high-effort, high-control end of the cooling spectrum. If you're weighing it against the stock approach, start by understanding the baseline it replaces in air cooling, and how the silent-running advantage maps to the noise level (dB) profile of your site. Because immersion concentrates heat into a single fluid loop rather than spreading it across each hashboard heatsink, it pairs naturally with the kind of careful tuning D-Central specializes in.
If you're planning an immersion build or just deciding whether the complexity is worth it for your hardware, browse the rigs and components in the D-Central shop and reach out — matching the right miner and configuration to your cooling strategy is exactly the kind of decision we help Canadian miners get right before the fluid goes in the tank.