The Antminer T21 is Bitmain's mid-tier entry in the S21 generation — a 190 TH/s air-cooled SHA-256 miner positioned below the flagship S21 series on both hashrate and efficiency, but with a lower acquisition cost per unit. This overview covers the T21's full specs, January 2024 economics, and where it fits for operators evaluating fleet purchases ahead of the April 2024 halving.

Background

Bitmain unveiled the T21 alongside the S21 series at the World Digital Mining Summit in Hong Kong in late 2023, with first shipments arriving in early 2024. The T21 sits as a deliberately positioned mid-tier model: 190 TH/s at 19.0 J/TH, compared to the air-cooled S21's 200 TH/s at 17.5 J/TH. The T21 trades a few percentage points of efficiency for a meaningfully lower price point per unit, which makes it relevant for operators prioritizing upfront capital efficiency over long-run J/TH performance.

One distinguishing feature of the T21 worth flagging upfront: it ships with a three-phase 380–415V power input requirement. This is uncommon for Antminers in this hashrate class and means the T21 is not plug-and-play compatible with most existing single-phase PDU setups. Operators planning a T21 deployment need to verify their electrical infrastructure before ordering.

Antminer T21 Specifications

Hashcost Breakeven Analysis

As of late January 2024, USD hashprice was trading around $80 per PH/day (Luxor Hashprice Index). The table below shows T21 daily profitability across a range of electricity costs at that hashprice level.

At the current pre-halving hashprice, the T21 is profitable across a wide range of electricity costs — even at $0.12/kWh, daily profit is close to $5 per machine. The miner's nameplate breakeven electricity cost at $80 hashprice sits at approximately $0.175/kWh. For most North American and European industrial operators in the $0.04–$0.08/kWh range, the T21 generates meaningful margin.

LuxOS Firmware Compatibility

LuxOS — Luxor's proprietary firmware for Bitmain Antminers — supports the T21 alongside the broader S19 and S21 generations. LuxOS unlocks autotuning, advanced power management, and real-time monitoring through the Luxor dashboard. For T21 operators looking to push efficiency below the 19 J/TH nameplate, LuxOS is the most direct lever available.

You can explore LuxOS at luxor.tech/firmware.

Who Should Buy the T21?

• Operators with sub-$0.05/kWh power who want to expand fleet hashrate at the lowest possible upfront cost per terahash.
• Buyers with existing three-phase 380–415V infrastructure who can deploy without electrical retrofits.
• Operators prioritizing payback period over long-run efficiency, accepting that the 19 J/TH efficiency makes the T21 more sensitive to post-halving hashprice compression than the S21 generation flagships.
• Operators running mixed fleets who want LuxOS firmware optimization across the full S19 and S21 stack — the T21 fits the same firmware lifecycle.

Where to Buy

For T21 pricing, availability, and fleet-scale orders, reach out to Luxor's hardware trading desk via luxor.tech/hardware. Luxor's desk handles both single-unit and bulk institutional orders.

For live hashprice, real-time profitability calculations, and the latest ASIC market data, visit

About Luxor Technology Corporation 

Luxor delivers hardware, software, and financial services that power the global compute and energy industry. Its product suite spans Bitcoin Mining Pools, ASIC Firmware, Hardware trading, Hashrate Derivatives, Energy services, and a bitcoin mining data platform, Hashrate Index.

Disclaimer

This content is for informational purposes only, you should not construe any such information or other material as legal, investment, financial, or other advice. Nothing contained in our content constitutes a solicitation, recommendation, endorsement, or offer by Luxor or any of Luxor’s employees to buy or sell any derivatives or other financial instruments in this or in any other jurisdiction in which such solicitation or offer would be unlawful under the derivatives laws of such jurisdiction.