Next-Generation Bitcoin Mining. 151 TH/s. 17.5 J/TH. Built on 5nm.
The Bitmain Antminer S21 (151TH) is a next-generation SHA-256 Bitcoin ASIC miner powered by the BM1368 — Bitmain's 5nm chip architecture manufactured by TSMC. At 17.5 J/TH, the S21 is approximately 40% more efficient than the previous-generation S19j Pro (29.5 J/TH), meaning more Bitcoin mined per dollar spent on electricity. The S21 represents a genuine generational leap: same proven Antminer chassis, fundamentally better silicon underneath. PSU included. Requires a dedicated 240V circuit.
151
TH/s Hashrate
17.5 J/TH
Efficiency
2643W
Power Draw
Important — power requirements
This miner requires a dedicated 220–240V AC, 20A circuit. It will not run on a standard 10A household outlet. Australian 240V power is compatible, but the S21 needs its own dedicated circuit — a standard air-conditioning or EV charger circuit works. A P13 power connector is required (not the older C13 used on the S19 series). If you need guidance on suitable AU power setups, contact MinerHub before purchasing.
The BM1368 chip — why it matters
The BM1368 is Bitmain's 5nm ASIC manufactured on the TSMC process node — the same fab used by Apple's M-series chips. At 17.5 J/TH, it delivers roughly the same efficiency per terahash as the flagship S19 XP Hydro, but in a standard air-cooled chassis without the cooling infrastructure cost. Every chip runs at lower voltage (0.28V core vs 0.34V on older chips), meaning less heat per unit of compute — which translates directly to lower electricity bills and longer hardware lifespan.
Where the S21 151TH sits in the lineup
S21 151TH ← this unit
Hashrate151 TH/s
Power draw2643W
Efficiency17.5 J/TH
S21 200TH
Hashrate200 TH/s
Power draw3500W
Efficiency17.5 J/TH
S21 Pro 234TH
Hashrate234 TH/s
Power draw3510W
Efficiency15 J/TH
All three S21 models share the same BM1368 chip platform and 17.5 J/TH efficiency rating. The 151TH variant draws 857W less power than the 200TH — making it the most practical choice for miners on a single 20A circuit or those managing electricity costs carefully.
Supported coins
BTC — Bitcoin
BCH — Bitcoin Cash
BSV — Bitcoin SV
Why the Antminer S21?
- 151 TH/s SHA-256 — BM1368 5nm chip
- 17.5 J/TH — 40% better than S19j Pro
- 2643W — lowest power in S21 range
- Integrated APW12 PSU — no separate purchase
- 4-fan push-pull air cooling — 24/7 stable
- Fits a single dedicated 20A 240V circuit
- Ethernet connectivity — reliable pool connection
- Bitmain web dashboard — hashrate monitoring
- Bitmain 365-day factory warranty (new unit)
- AU warranty + MinerHub expert support
Recommended mining pools
Foundry USA Pool
World's largest BTC pool · FPPS · No registration required
Antpool (Bitmain)
Official Bitmain pool · PPS+ · Direct manufacturer support
F2Pool
Asia-Pacific latency advantage · PPS+ · 2.5% fee
ViaBTC
PPS / PPLNS / SOLO modes · Strong AU uptime
Full specifications
Technical Specifications
| Specification |
Value |
| Model |
Antminer S21 (151TH) |
| Manufacturer |
Bitmain |
| ASIC chip |
BM13685nm TSMC process — same fab as Apple M-series chips
|
| Algorithm |
SHA-256 |
| Hashrate |
151 TH/s±3% variance
|
| Power consumption |
2643W±5% variance at wall · 857W less than the 200TH model
|
| Energy efficiency |
17.5 J/THat 25°C ambient · ~40% better than S19j Pro (29.5 J/TH)
|
| Noise level |
75 dBrequires ventilated, dedicated space
|
| Input voltage |
220–240V AC20A dedicated circuit required — P13 connector
|
| Cooling |
Air-cooled — 4 PWM fans (push-pull)enhanced shroud design vs S19 series
|
| Connectivity |
Ethernet RJ45 10/100M |
| Interface |
Bitmain web dashboardbrowser-accessible, no software install
|
| Supported coins |
BTC, BCH, BSVany SHA-256 Stratum V1 pool
|
| PSU |
Integrated APW12built-in, no separate PSU required
|
| Dimensions (L×W×H) |
400 × 195 × 290 mm |
| Net weight |
15.4 kg |
| Operating temperature |
0°C – 45°Cderate max temp 1°C per 300m above 900m altitude
|
| Humidity range |
10% – 90% RHnon-condensing
|
| Max altitude |
≤2000 m |
| Release date |
February 2024 |
| Bitmain warranty |
365 daysbrand new Bitmain factory warranty
|
| MinerHub warranty |
AU Warranty support via MinerHub |
Bitcoin mining profitability depends on network difficulty, BTC price, electricity costs, and other market conditions. MinerHub does not guarantee mining returns. All hashrate, power, and efficiency figures are manufacturer-stated typical values (±3–5%). Electrical requirements: a dedicated 220–240V, 20A circuit is required — consult a licensed Australian electrician if needed. The S21 uses a P13 power connector, not the C13/C14 used on S19-series miners — ensure you have a compatible power cable. 75 dB operation requires a ventilated space away from living areas.
