The Bitmain Antminer T21 is the cost-optimized counterpart to the S21, delivering 190 TH/s at 19 J/TH. Positioned as the budget-friendly entry point into Bitmain’s current generation of miners, the T21 sacrifices some efficiency compared to the S21 but comes at a meaningfully lower price point — making it an attractive option for operators who need to maximize hashrate per dollar invested rather than per watt consumed.
The T21 shares the same physical form factor and general architecture as the S21, which means accessories, cooling setups, and infrastructure designed for the S21 work with the T21 as well. For miners stepping up from S19-era hardware, the T21 still represents a substantial generational improvement.
Antminer T21 Full Specifications
| Specification | Details |
|---|---|
| Manufacturer | Bitmain |
| Model | Antminer T21 |
| Algorithm | SHA-256 |
| Hashrate | 190 TH/s |
| Power Consumption | 3,610W (±5%) |
| Efficiency | 19 J/TH |
| Noise Level | 75 dB |
| Weight | 14.4 kg |
| Dimensions | 400 x 195 x 290 mm |
| Operating Temperature | 5-45 °C |
| Cooling | 4 x high-speed fans (air-cooled) |
| ASIC Chip | BM1368 |
| Chip Count | ~330 |
| Input Voltage | 220-277V AC |
| Network Connection | Ethernet (RJ45) |
| Release Date | 2024 |
Performance Analysis
At 19 J/TH, the T21 sits between the Antminer S21 (17.5 J/TH) and the Whatsminer M60S (18.5 J/TH) in efficiency. It is significantly more efficient than the entire S19 lineup — the S19k Pro at 23 J/TH, the S19 XP at 21.5 J/TH, and the S19j Pro at 29.5 J/TH are all substantially behind.
The T21 uses the same BM1368 chip as the standard S21 but with a slightly lower-binned selection, resulting in the modest efficiency gap. In practical terms, the T21 draws 3,610W versus the S21’s 3,500W while hashing at 190 TH/s versus 200 TH/s — a trade-off that is easily justified by the lower acquisition cost.
For a full ranking of miners by efficiency, see our Most Efficient Bitcoin Miners 2026 guide.
Profitability Snapshot
Estimated daily revenue and cost at current network difficulty (approximate, based on typical 2026 conditions). Actual results depend on Bitcoin price, network difficulty, and pool fees.
| Electricity Rate | Daily Power Cost | Monthly Power Cost | Viability |
|---|---|---|---|
| $0.05/kWh | $4.33 | $130 | Highly profitable — cheap power plus low upfront cost equals fast ROI |
| $0.08/kWh | $6.93 | $208 | Profitable — solid margins at average North American electricity rates |
| $0.10/kWh | $8.66 | $260 | Marginal — profitability depends on BTC price; still ahead of S19-class machines |
| $0.12/kWh | $10.40 | $312 | Tight — the 19 J/TH starts to feel the squeeze; offset with heating value |
Use our Bitcoin Mining Profitability Calculator for real-time estimates with your exact electricity rate, or check our Bitcoin Mining Electricity Cost by State & Province guide to find your local rate.
Best Use Cases
Budget-Conscious Farm Operators: The T21’s primary selling point is its lower price per TH/s compared to the S21. For operators building out capacity on a budget, deploying T21s instead of S21s can mean more total hashrate for the same capital investment — as long as electricity is cheap enough to absorb the slight efficiency penalty.
Home Mining: Like its S21 sibling, the T21 requires 220V+ power, produces 75 dB of noise, and needs proper ventilation. With a D-Central cooling shroud and dedicated space, it works well in residential setups. The lower acquisition cost makes it an easier entry point for home miners stepping up from older hardware.
Dual-Purpose Heating: The T21 outputs approximately 12,318 BTU/h of heat — slightly more than the S21 due to its marginally higher power draw. This makes it an effective heating source during cold months. See our Bitcoin Space Heater vs Electric Heater analysis.
Fleet Diversification: Some operators mix T21s and S21s in their fleet — deploying S21s on expensive circuits and T21s where electricity is cheapest. This cost-optimization strategy maximizes total hashrate across variable power costs.
Compatible Firmware
| Firmware | Compatibility | Key Features |
|---|---|---|
| Stock (Bitmain) | Full support | Default firmware, basic configuration |
| Braiins OS+ | Supported | Autotuning, Stratum V2, power capping, remote management |
| Vnish | Supported | Advanced overclocking, custom profiles, immersion mode |
| LuxOS | Supported | Curtailment features, fleet management, API access |
For detailed installation instructions, see our guides:
- Antminer Firmware Compatibility Matrix 2026
- Braiins OS+ Setup & Configuration Guide
- Vnish Firmware Guide
- LuxOS Firmware Guide
- Antminer Firmware Update Guide
Common Issues & Repair
Common issues with the Antminer T21 include:
- Hashboard failures: The BM1368 chips can fail due to thermal stress or power delivery issues. Since the T21 uses lower-binned chips, thermal management is especially important.
- Fan errors: Fan failures or speed sensor malfunctions trigger automatic shutdown protection. Compatible replacement fans are available.
- Temperature warnings: Ensure ambient temperatures stay within the 5-45 degrees C operating range. The T21 generates slightly more heat per TH than the S21, so cooling margins matter.
- Firmware issues: Some early T21 batches shipped with firmware that benefits from updating. See our firmware update guide for instructions.
D-Central offers professional Antminer T21 Repair services from our Canadian workshop. We diagnose and repair hashboard, control board, PSU, and fan issues with fast turnaround. See our ASIC Repair Cost Estimator for pricing.
Where to Buy
D-Central carries the Antminer T21 and ships across Canada and internationally. Contact our sales team for current pricing and availability. We also stock compatible replacement fans and cooling accessories for the T21 platform.