S9 Immersion Cooling: Antminer

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"Essentially," I said.

The Antminer S9 (typically 11.5–14 TH/s) is an air-cooled workhorse from 2016–2018. While obsolete for large-scale mining, it remains popular for hobbyists, home miners, and learning setups. Its main drawback: . Air cooling requires high-RPM fans (70–75 dB), making indoor use unbearable.

My friends thought I was insane. "You're going to dump your $2,000 miners into a fish tank?" antminer s9 immersion cooling

By the end of the night, I had those old S9s—hardware that was supposed to be obsolete—hashing at . They were running nearly 30% above their factory limit, and they were running cooler than they ever had in air.

Finally, the day came. The garage was hot, sticky, and quiet. The tank was filled with three gallons of clear, odorless dielectric fluid. I had the pump primed.

I spent a week plumbing copper tubing and installing a high-flow pump. I had to strip the Antminers first. This was the most counter-intuitive part of the process. The Advantages of Immersion Cooling for Miners Immersion

On the dashboard, the temperature read:

The theory was seductive. Instead of air, you submerge the hardware in a bath of dielectric fluid—a specialized mineral oil that doesn’t conduct electricity but eats heat for breakfast. It’s the same tech they use to cool massive transformers on power lines.

: With custom firmware (like Braiins OS+), an S9 can be overclocked from its stock 13.5–14 TH/s up to 20.2+ TH/s . Immersion cooling | ASIC user guide from BiXBiT

: Removing the fans eliminates the "jet engine" noise, making the S9 suitable for at-home operations or quiet residential areas.

I took a screwdriver to the S9s. Rip. Off came the loud, high-RPM fans. Rip. Off came the metal shrouds.

Immersion cooling transforms the Antminer S9 from a screaming space heater into a quiet, cool-running piece of tech. It’s an excellent learning project for immersion fundamentals before scaling to newer miners. Just don’t expect to ROI on the fluid – do it for the experience and silence.