Product Overview

The Bitmain Antminer T21 180Th is the base variant in Bitmain’s T21 series — a commercial-grade Bitcoin (BTC) SHA-256 ASIC miner delivering 180 terahashes per second at approximately 20 J/TH efficiency. The T21 series is Bitmain’s efficiency-optimised counterpart to the premium S21 lineup, offering improved performance over S19-era hardware at a more accessible price point than the flagship S21 Pro models.

The T21 180Th sits at the entry level of the T21 product family, beneath the 190T variant. At 180 TH/s and ~3610W, it offers the same efficient 5nm-class chip architecture as its sibling in a lower-binned configuration, making it a practical choice for operators who want T21-generation efficiency without paying a premium for top-tier hashrate.

Compared to the previous T19 generation (37.5 J/TH), the T21 180Th’s 20 J/TH represents a substantial efficiency improvement in the same air-cooled form factor. For South African operators replacing older hardware or building out a new Bitcoin mining fleet, it represents excellent value within the current generation of Bitmain’s product range.

Key Features

• 180 TH/s hashrate: Strong Bitcoin mining output from the base T21 variant, providing significant SHA-256 pool contribution per deployed unit.
• ~20 J/TH efficiency: At approximately 3610W, the T21 180Th operates at around 20 J/TH — a major improvement over T19-era hardware (37.5 J/TH) and competitive with current-generation S19k Pro and S21 lower-tier models.
• Air-cooled dual fan design: Standard industrial ASIC enclosure with dual high-speed fans. No specialist cooling required — compatible with standard mining farm rack deployment.
• SHA-256d algorithm: Mines Bitcoin (BTC), Bitcoin Cash (BCH), and Bitcoin SV (BSV). Bitcoin is the standard target for all SHA-256 hardware.
• T21-generation chip architecture: Built on the same 5nm platform as the T21 190T, delivering the same efficiency class at a lower hashrate binning level and correspondingly lower unit cost.
• Ethernet (RJ-45) connectivity: Wired network connection for pool communication. Standard Antminer web interface for configuration and monitoring.
• Bitmain ecosystem: Standard Antminer firmware, pool support, and management tooling. Compatible with Bitmain’s monitoring infrastructure and third-party mining management software.

Technical Specifications

• Algorithm: SHA-256d
• Supported coins: Bitcoin (BTC), Bitcoin Cash (BCH), Bitcoin SV (BSV)
• Hashrate: 180 TH/s (±3%)
• Power consumption: ~3610W (±5%) at 25°C ambient
• Power efficiency: ~20 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’s 230V/50Hz supply is within the T21 180Th’s 200–240V input range. No voltage converter is required.

At approximately 3610W continuous draw, the T21 180Th requires a dedicated high-amperage circuit. A dedicated 32A circuit, installed by a registered electrician, is required for single-unit operation. Standard 16A domestic circuits are insufficient. For multi-unit commercial deployments, each unit requires individual circuit protection on a dedicated distribution board.

Load shedding at 3.61 kW means a 10kWh residential battery provides approximately 2.8 hours of operation — insufficient for extended outages without generator or commercial backup power. Operators should plan for uninterrupted power solutions if continuous operation is required.

Thermal management: the T21’s dual fans require clear airflow at both inlet and exhaust faces. Maintain ambient temperature below 45°C. Active air extraction recommended for enclosed mining rooms, particularly in South Africa’s warmer summer climates.

Electricity Cost Context — South Africa

Running the T21 180Th at 3610W continuously consumes approximately 86.6 kWh per day, or roughly 2 599 kWh per month. At R2.80/kWh (reference residential tariff — municipal rates vary), the estimated monthly electricity cost is approximately R7 277 per month.

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

The T21 180Th’s 20 J/TH efficiency means it produces more Bitcoin per rand of electricity than older T19 or S19 Pro hardware at the same power cost. At standard South African residential tariffs, commercial or industrial power access is strongly preferable. This is a cost estimate only — not a profitability projection.

Ideal Use Cases

• Commercial Bitcoin mining operations: Purpose-built facilities with dedicated power supply seeking T21-generation efficiency at the T21 180Th’s lower unit cost compared to the 190T.
• Hardware refresh from T19 or S19 Pro: Operators replacing first-generation T19 (37.5 J/TH) or S19 Pro hardware with meaningfully more efficient T21-generation equipment.
• Cost-conscious fleet building: When per-unit cost matters more than maximum per-unit hashrate, the T21 180Th provides T21-generation efficiency at a lower upfront investment than the T21 190T.
• Pool mining participants: Works with all major SHA-256 Bitcoin pools. Reliable and straightforward to configure for pool-based income.
• Mixed T21 fleet operators: Can be deployed alongside T21 190T units without infrastructure changes — same form factor, power draw, and rack requirements across the T21 range. See also: Bitmain Antminer T21 190T.

Frequently Asked Questions

Does the Antminer T21 180Th work on South African power?
Yes. SA’s 230V/50Hz is within the T21’s input range. A dedicated 32A circuit from a registered electrician is required for safe continuous operation.

What is the difference between the T21 180Th and T21 190T?
Both use the same T21-generation 5nm chip architecture and share an identical chassis. The 190T delivers 190 TH/s vs 180 TH/s, at essentially the same power draw (~3610W). The 180Th is the more cost-accessible entry into the T21 platform. See: Bitmain Antminer T21 190T.

What Bitcoin pools are compatible with the T21 180Th?
All major SHA-256 pools: Foundry USA Pool, AntPool, F2Pool, ViaBTC, Braiins Pool. Standard Antminer web interface configuration.

How does the T21 180Th compare to the S21 Pro series?
The S21 Pro operates at 15–15.5 J/TH, making it significantly more efficient than the T21’s 20 J/TH. The S21 Pro is premium-tier hardware at a higher unit cost. The T21 180Th is the value-oriented T-series option for operators where upfront cost is a constraint.

Can I undervolt the T21 180Th to reduce power costs?
Yes — the Antminer T21 supports power tuning via its web interface. Reducing power mode lowers both hashrate and electricity consumption, which can improve economics at higher electricity tariffs.

What’s Included

• 1× Bitmain Antminer T21 180Th ASIC miner unit
• Integrated or bundled PSU (confirm with order)
• Power cable (region-specific — South African plug may require local adaptor or electrician wiring)
• Ethernet cable not included
• Quick-start guide