Antminer S21 / T21 Fan Speed Simulator – Water Cooling & Silencer Upgrade
Upgrade your Antminer S21, S21 Pro, T21, or S21 XP to water cooling or install low-noise blowers without triggering the firmware's fan-error shutdown. This 4-in-1 fan speed simulator emulates normal RPM signals on all four fan headers simultaneously, so the miner continues hashing while your custom cooling solution handles the thermals.
4-in-1 Speed Controller for All S21/T21 Fan Headers
Bitmain's latest-generation miners monitor each fan channel independently. If any channel reports zero RPM, the board shuts down to prevent thermal damage. The simulator feeds a plausible tach signal to every header at once, giving you full freedom to replace the stock fans with a closed-loop water block, an immersion tank, or aftermarket silent blowers — whatever suits your noise and thermal requirements.
Easy Installation, No Firmware Changes
Simply unplug the stock fans, connect the simulator to the same 4-pin headers, and power on. There is no kernel patch, no SD card flash, and no warranty-voiding firmware modification. If you ever want to revert to air cooling, pull the simulator and re-attach the original fans.
🇺🇸🇪🇺 USA & European Union (DDP): Orders are delivered DDP. All customs duties, import taxes, and fees are included — no additional charges on delivery.
🌍 Rest of world: Orders ship from China. Depending on your country, local customs authorities may apply import duties or taxes.
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