Antminer S21 Plus Unboxed: 235 TH/s at 15.2 J/TH — Is It Worth It?

Marketing Oneminers
2026-04-29T16:57:01+02:00

Lucas from OneMiners unboxes and reviews the Antminer S21 Plus — Bitmain’s mid-range addition to the S21 series. Delivering 235 TH/s at 15.2 J/TH efficiency and 3.5 kW power draw, the S21 Plus sits between the base S21 and the premium S21 Pro. Covers noise, heat management, what’s in the box, and value proposition for everyday miners.
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📦 Bitmain’s S21 lineup just keeps growing — and the S21 Plus lands right in the sweet spot. Lucas from OneMiners unboxes the Antminer S21 Plus live: 235 TH/s of hashrate, 15.2 J/TH efficiency, and a 3.5 kW power draw that outperforms most of its S21 siblings. Is it the best value in the lineup? Let’s find out.

235 TH/s

Hashrate

3.5 kW

Power Draw

15.2 J/TH

Efficiency

10+

S21 Variants Total

Mid

Lineup Position

★★★★

Value Rating

📊 S21 Series Positioning

S21 Base

Entry

Lower hashrate and price. Good starting point but less efficient than the Plus.

S21 Plus

🏆 Sweet Spot

235 TH/s · 15.2 J/TH · 3.5 kW. Best price-to-performance ratio in the mid-range S21 lineup.

S21 Pro / XP

Premium

Higher hashrate and efficiency but at a significant price premium. For large-scale operations.

⚡ Key Highlights

235 TH/s hashrate — high performance without the premium price of the S21 Pro or XP

15.2 J/TH efficiency — outperforms many previous S21 models in power usage

3.5 kW power draw — manageable for both home setups and professional facilities

Bitmain cooling solutions tested live — heat and noise management reviewed in real conditions

Full unboxing — everything inside the box shown and explained

Sweet spot positioning — more power than base S21, more affordable than S21 Pro

10+ S21 variants in the lineup — S21 Plus sits right in the middle

🔧 Technical Specs

Model: Antminer S21 Plus (Bitmain)

Hashrate: 235 TH/s

Power consumption: 3,500W (3.5 kW)

Efficiency: 15.2 J/TH

Algorithm: SHA-256 (Bitcoin)

Cooling: air-cooled with Bitmain’s latest fan system

Lineup position: mid-range between S21 base and S21 Pro/XP

Best for: miners wanting high performance without premium pricing

💡 Why This Matters

With 10+ variants in the S21 lineup, choosing the right model matters. The S21 Plus hits a rare balance: enough hashrate to be competitive, efficient enough to keep electricity costs manageable, and priced below the premium tier.

At 15.2 J/TH, it outperforms older S19 models significantly and holds its own against newer competition. For miners who want to upgrade without overpaying for the XP’s marginal gains, the S21 Plus is a compelling choice.

15.2 J/TH beats most previous-gen S21 models on efficiency

235 TH/s is competitive hashrate for the current difficulty environment

3.5 kW is manageable in both home and hosted setups

Mid-range price = faster ROI compared to premium variants

🏆 OneMiners Hosting Context

The S21 Plus performs best when paired with low-cost electricity. At OneMiners’ hosting rates starting from $0.04/kWh, the S21 Plus’s 3.5 kW draw becomes significantly more profitable than running it at home rates.

⚡ Electricity from $0.04/kWh across 20+ global locations

💰 0% management fees on hosted miners

🛡️ 7-year warranty on all hosted hardware

💳 Buy Now, Pay Later — 25% down to get started

🤖 AI smart mining optimization — up to +11.5% additional revenue

Ready to deploy your Antminer S21 Plus in a professional facility?
Explore Hosting Locations →

Disclaimer: Profitability figures depend on Bitcoin price, network difficulty, and electricity rates, all of which change frequently. Always conduct your own research before purchasing mining hardware.