Antminer S21 — 挖矿盈利能力
概述
The Antminer S21 is Bitmain's December 2023 entry-level S21-series miner, delivering 200 TH/s at 17.5 J/TH and 3,500 W. It was positioned as the volume product of the S21 launch — easier to source than the XP variant, with a $/TH price point friendly to new buyers and small-to-mid hosting setups. Two years on, the base S21 sits in the transitional tier: its efficiency is competitive on cheap electricity but can't match the sub-15 J/TH machines that dominate post-halving economics. Within the Bitmain lineup it sits below the S21 XP (270 TH/s, 13.5 J/TH) and the S23 (318 TH/s, 11 J/TH). Common deployments include hosting facilities, retail home-pro setups with adequate noise mitigation, and farms balancing capex with operational cost.
查看术语表 →规格参数
算力
200 TH/s
功耗
3,500W
能效
17.5 J/TH
散热方式
Air
发布日期
December 2023
Est. $/TH
$13.8/TH
制造商
Bitmain
实时盈利能力
2028 减半的影响
The April 2028 halving cuts the block subsidy from 3.125 to 1.5625 BTC and mechanically halves the hashprice. At today's hashprice ($39/PH/day), the Antminer S21 at 0.20 PH/s generates ~$8/day in gross revenue. Post-halving, that drops to ~$4/day at constant BTC price. Break-even electricity tightens from ~$0.092/kWh today to ~$0.046/kWh post-halving. At 17.5 J/TH, the base S21 sits squarely in the transitional band — it loses comfortable margin post-halving on grid-tied power but survives at industrial rates ($0.05/kWh and below). Operators using S21s typically plan to retire or relocate the fleet during the 2028–2029 window if their power cost is above $0.06/kWh.
查看减半倒计时 →与类似机型对比
Whatsminer M60S+
212 TH/s · 17 J/TH · Air
Whatsminer M61S+
238 TH/s · 17 J/TH · Air
Whatsminer M63S+
424 TH/s · 17 J/TH · Air
常见问题
Is the Antminer S21 profitable today?▾
At the current hashprice ($39/PH/day), the S21 generates ~$8/day in gross revenue. Profitability depends linearly on your electricity cost: at $0.04/kWh you keep a healthy net margin; at break-even ($0.092/kWh) the machine clears zero; above that, it operates at a loss. Use the live calculator on this page with your real electricity rate to get an exact figure.
What's the break-even electricity cost for the Antminer S21?▾
At the current hashprice ($39/PH/day), break-even sits at ~$0.092/kWh. The formula: daily revenue (0.20 PH/s × hashprice) divided by daily energy consumption (3.5 kW × 24h = 84 kWh) gives the kWh price at which gross revenue equals electricity cost. Apply 2% pool fee and the practical ceiling drops slightly. After the 2028 halving, break-even tightens to ~$0.046/kWh.
How does the 2028 halving affect the Antminer S21?▾
The halving halves the hashprice. For the S21 at 0.20 PH/s, daily gross revenue drops from ~$8 to ~$4 at constant BTC price. Break-even electricity tightens from ~$0.092/kWh to ~$0.046/kWh. At 17.5 J/TH, the S21 needs power at $0.05/kWh or below to keep meaningful net margin post-halving. Above $0.07/kWh, the machine becomes a candidate for retirement or relocation.
What's the lifespan of an Antminer S21?▾
Air-cooled ASICs typically last 4–6 years of continuous operation in a clean, well-cooled datacenter environment. The S21 was launched late 2023, so units deployed at launch are entering their 3rd year of service. Hardware rarely fails first; economic obsolescence does. Plan a 4–5 year productive window, with 2028 halving as the inflection point — operators below $0.05/kWh can run S21s into 2029–2030, others typically refresh sooner.
Antminer S21 vs Antminer S21 XP — which one to pick?▾
The S21 XP delivers 270 TH/s at 13.5 J/TH versus the S21's 200 TH/s at 17.5 J/TH — about 23% better efficiency for ~$2,000–3,000 more per unit at MSRP. The XP wins above $0.05/kWh: the energy savings recover the price gap within 18–24 months and stretch productivity past the 2028 halving. The base S21 wins below $0.04/kWh and on the secondary market where price gaps are exaggerated. For a new buildout above $0.05/kWh, default to the XP; for low-cost industrial sites or used-fleet acquisitions, the base S21 is fine.