Product Overview

The Bitmain Antminer T21 190T is a high-performance Bitcoin (BTC) SHA-256 ASIC miner from Bitmain, positioned as the efficiency-optimised counterpart to the flagship S21 series. Running at 190 terahashes per second, it is one of the highest-performing T-series miners Bitmain has produced and delivers competitive efficiency figures that make it viable for commercial Bitcoin mining operations.

The T21 series sits below the S21 in Bitmain’s product hierarchy but offers meaningfully better value-for-money in terms of cost-per-terahash. The T21 190T specifically benefits from Bitmain’s 5nm-class chip architecture, delivering approximately 19 J/TH — a substantial improvement over prior T-series hardware such as the T19 (37.5 J/TH). This makes it one of the more efficient air-cooled miners available without stepping up to hydro or immersion cooling infrastructure.

For South African operators, the T21 190T’s 19 J/TH efficiency profile makes it one of the better options for managing electricity costs relative to mining output. Its performance is strong enough for commercial farm deployment while the 5640W power draw requires appropriate electrical infrastructure planning.

Key Features

• 190 TH/s hashrate: One of Bitmain’s highest-performing T-series miners, delivering 190 TH/s to give operators strong pool contribution per deployed unit.
• ~19 J/TH efficiency: At approximately 3610W, the T21 190T operates at around 19 J/TH — significantly more efficient than earlier T-series hardware and competitive with the broader 5nm-generation of Bitcoin miners.
• Air-cooled dual fan design: No specialist cooling infrastructure required. Compatible with standard mining farm rack deployment, making it accessible to operators without immersion or hydro facilities.
• SHA-256d algorithm: Mines Bitcoin (BTC) as primary coin. Also compatible with other SHA-256d networks including Bitcoin Cash (BCH) and Bitcoin SV (BSV).
• Standard Bitmain ecosystem: Compatible with Bitmain’s existing pool, monitoring, and firmware ecosystem. Operators already running S19 or S21-series hardware will find the T21 familiar to manage.
• Ethernet (RJ-45) connectivity: Single wired network port for pool connection. Configured via built-in web interface accessible on the local network.
• Proven Bitmain reliability: Bitmain is the world’s largest ASIC miner manufacturer. The T21 series benefits from extensive field deployment, firmware support, and a global repair/parts ecosystem.

Technical Specifications

• Algorithm: SHA-256d
• Supported coins: Bitcoin (BTC), Bitcoin Cash (BCH), Bitcoin SV (BSV)
• Hashrate: 190 TH/s (±3%)
• Power consumption: ~3610W (±5%) at 25°C ambient
• Power efficiency: ~19 J/TH (±5%)
• Cooling type: Air-cooled, dual high-speed fans
• Noise level: ~75 dB(A)
• Input voltage: 200–240V AC
• Networking: Ethernet (RJ-45)
• Operating temperature: 5°C to 45°C
• Dimensions (L×W×H): 400 × 195 × 290 mm
• Net weight: ~16 kg

Power & Installation Notes

South Africa operates on 230V AC at 50Hz, which is within the Antminer T21 190T’s input voltage range of 200–240V. No voltage converter or step-down transformer is required for South African installations.

At approximately 3610W continuous draw, the T21 190T requires a dedicated electrical circuit. A dedicated 32A circuit wired by a registered electrician is recommended — this exceeds the safe continuous load of a standard South African 16A domestic circuit. Each additional unit deployed in a farm requires its own circuit or a properly rated distribution panel. Never run this machine on a shared household circuit or extension lead.

South Africa’s load shedding reality must be factored into operational planning. At 3.6 kW, running the T21 190T through a residential battery backup system is impractical — a 10kWh home battery would provide less than 3 hours of runtime. A generator or commercial UPS with adequate capacity is necessary for uninterrupted mining through scheduled outages.

Proper ventilation is critical. The T21 190T’s dual fans exhaust substantial heat. Mining rooms should have active air extraction and the ambient temperature should be maintained below 40°C. In South Africa’s warmer climates, this may require active cooling (air conditioning or evaporative cooling) in summer months.

Electricity Cost Context — South Africa

The Antminer T21 190T running continuously at 3610W consumes approximately 86.6 kWh per day, or roughly 2 599 kWh per month. At the indicative residential reference tariff of R2.80/kWh (note: municipal rates vary), the estimated monthly electricity cost is approximately R7 277 per month.

Calculation: (3610 ÷ 1000) × 24 × 30 × R2.80 = ~R7 277/month.

At standard residential tariffs, this running cost is a significant operating expense. The T21 190T’s 19 J/TH efficiency helps it perform better than older, less efficient hardware under the same electricity cost pressure — but commercial or below-average electricity rates are strongly preferable. This is an electricity cost estimate only and does not represent a profitability calculation.

Ideal Use Cases

• Commercial Bitcoin mining operations: Operators managing 5–50+ units in purpose-built facilities with commercial power supply and electrical infrastructure in place.
• Efficiency-focused operators replacing older hardware: An ideal replacement for T19, S17, or S19 XP-class miners, with significantly better efficiency in the same footprint.
• Cost-conscious operators who want high hashrate without S21-level pricing: The T21 190T offers competitive efficiency at a lower unit cost than the flagship S21 series, making it attractive for scaling capacity on a budget.
• Pool mining participants: Works with all major Bitcoin mining pools — Foundry, AntPool, F2Pool, ViaBTC, Braiins — for consistent, predictable pool income.
• Container and warehouse farm deployments: Standard form factor and air-cooling make the T21 190T straightforward to rack and deploy in purpose-built mining containers or converted warehouses.

Frequently Asked Questions

Does the Bitmain Antminer T21 190T work on South African power?
Yes. South Africa’s 230V/50Hz supply is fully compatible. A dedicated 32A circuit from a registered electrician is required for safe continuous operation — standard household sockets are insufficient.

How does the T21 190T compare to the Bitmain S21 series?
The T21 190T delivers 190 TH/s at ~19 J/TH, while the S21 Pro 234T offers 234 TH/s at approximately 15 J/TH. The S21 series is more efficient but more expensive. The T21 190T offers good value for operators who prioritise lower upfront cost over peak efficiency. See: Bitmain Antminer S21 Pro 234Th.

What pools work with the Antminer T21 190T?
All standard Stratum-protocol SHA-256 pools are compatible. Configure pool settings via the miner’s built-in web interface using the pool URL, worker name, and password.

How loud is the T21 190T?
At approximately 75 dB(A), it is not suitable for home living spaces. A dedicated room, outbuilding, or mining container with sound management is required.

Can I undervolt or tune the T21 190T to reduce power draw?
Yes, the Antminer T21 supports power tuning via its web interface. Reducing power mode will lower both hashrate and electricity consumption, which can improve economics at higher electricity tariffs. Consult the official Bitmain firmware documentation for tuning options.

What’s Included

• 1× Bitmain Antminer T21 190T ASIC miner unit
• Power supply unit (confirm with order — T21 units typically include integrated PSU)
• Power cable (region-specific — South African plug connection may require locally sourced cable or electrician wiring)
• Ethernet cable not included
• Quick-start guide