Antminer T21 190T The Budget Alternative to the S21
The Antminer T21 is making waves as a powerful, budget-friendly alternative to premium mining machines like the S21.
With a robust hashrate of 190 TH/s and an adaptable design for varied energy needs, the T21 is optimized for miners who prioritize cost-efficiency without sacrificing performance.
Discover how this machine balances profitability, durability, and affordability—perfect for low-cost energy regions like Ethiopia.
Read on to see why the T21 could be the strategic choice for your next mining setup.
1. Technical Specifications
The T21 delivers an impressive hashrate of 190 TH/s, ranking it among the most powerful air-cooled Bitcoin mining machines available. However, it falls short compared to its larger counterparts in the S21 Pro series, which significantly exceed 200 TH/s.
While maximizing hashrate is crucial, optimizing efficiency is even more important. The T21 offers a decent efficiency of 19 J/T. Although not the most efficient machine on the market, it can still generate an impressive gross profit margin if operating costs are low enough.
Ranked as the 9th most efficient Bitcoin mining machine, the T21 is 41% less efficient than the top air-cooled model, the Antminer S21 XP. However, as noted earlier, the most efficient machine isn’t always necessary for maximizing profits.
In terms of overall specifications, the T21 performs at an acceptable level and is highly likely to provide significant cash flow over the next four to five years, provided electricity costs remain affordable.
2. performance
Experienced miners know that nameplate specifications can sometimes be more optimistic than real-world performance, particularly with Antminer models. This makes real-world testing essential to get accurate insights into a machine's true efficiency, hashrate consistency, and power consumption under typical conditions.
We've been running several Antminer T21 units in Ethiopia for a few months, gathering real-world data on their performance, efficiency, and stability compared to the nameplate specifications.
In normal mode, the average electricity consumption per machine has been 3.718 kW, about 3% higher than the nameplate value, but still within the acceptable variance of ±5%. Interestingly, the machines have been producing slightly more hashrate than expected, which has balanced out the efficiency. Taking into account the higher hashrate, our real-life efficiency in Ethiopia is 19.3 J/T.
Our Ethiopian site operates under nearly ideal air-cooling conditions, with ambient temperatures between 18-23°C. So far, the T21 has performed well in these conditions, with only a 1.6% efficiency deviation, which is acceptable for air-cooled systems.
As for hashrate production, while the nameplate figure for the T21 in normal mode is 190 TH/s, our machines have been averaging 193 TH/s—1.6% higher than expected. This aligns with the typical performance of Bitmain models, which often slightly exceed their stated hashrate but consume a bit more power than advertised.
One notable feature of the Antminer T21 is its stock firmware, which allows owners to switch between two performance modes: Normal Energy Mode (NEM) and High Energy Mode (HEM). This flexibility enables users to adjust the machine's power consumption and performance based on their specific operational needs and cooling capacity.
As shown in the table, the Antminer T21's performance in High Energy Mode (HEM) is highly sensitive to ambient temperature. Bitmain specifies that the T21 can deliver an impressive 233 TH/s in HEM if the ambient temperature is between 0°C and 30°C, but only 214 TH/s if the temperature exceeds 30°C. This difference stems from the significant cooling demands of the machine, which consumes 3.61 kW in Normal Energy Mode (NEM) and a hefty 5.1 kW in HEM. Adequate cooling is essential to manage the heat generated, especially in less-than-ideal conditions.
We attempted to run the T21 in HEM in Ethiopia, but our containers, equipped with active air cooling, couldn't provide enough cooling to maintain optimal performance. As a result, we’ve continued operating them in NEM, which has been highly effective.
The key takeaway is that if you plan to operate the T21 in HEM, it's crucial to ensure sufficient cooling capacity. One practical solution is to reduce the number of machines in each container, making it easier for the cooling system to expel the hot air generated by these powerful units.
In summary, the Antminer T21 offers impressive hashrate performance at an acceptable efficiency, making it an excellent choice for miners in regions with low electricity costs. However, it's important to consider the machine's significant cooling requirements, especially if you aim to maximize hashrate by using HEM.
3. profitability
The primary objective of a Bitcoin mining machine is to maximize hashrate while minimizing energy consumption. The Antminer T21 meets this challenge by offering an impressive hashrate of 190 TH/s with an energy efficiency of 19 J/T. But how do these performance metrics translate into real-world mining profitability?
As illustrated in the chart above, with an electricity cost of $0.058/kWh available in Ethiopia, the Antminer T21 ranks as the fourth most profitable Bitcoin mining machine, achieving a direct BTC production cost of only $34.8k. This translates to a nearly 50% gross profit margin at the current Bitcoin price of $68.9k.
For miners looking to secure high gross margins over the long term, the Antminer T21 is an outstanding option, especially for those with access to inexpensive electricity. At the rate we offer in Ethiopia, this machine is expected to remain cash flow positive for at least four years, which aligns well with Bitcoin's historical four-year cycles.
If you're interested in learning more about the cost structure of Bitcoin mining and the various metrics used to estimate profitability, we recommend reading this article.
4. durability
As highlighted in this article, durability is a critical yet often overlooked factor when selecting a bitcoin mining machine. It is important to invest in a machine that can endure for at least 4-5 years before it becomes obsolete or is reduced to scrap metal.
Given that the Antminer T21 is a relatively new model, its durability remains somewhat speculative. However, based on Antimer’s historical track record of 4-5 years of durability, there is reason to believe this model will also prove to be long-lasting.
Moreover, we have encountered very few dead-on-arrival units in Ethiopia, and performance has remained consistently stable over the past few months. These observations suggest that the T21 is a durable option.
We expect that this machine will last at least 4-5 years when hosted in an optimal operating environment, providing a substantial timeframe for generating bitcoin for its owner.
5. price
One of the standout features of the Antminer T21 is its highly competitive pricing compared to more efficient models like the S21 and S21 Pro.
Currently, the T21 is attractively priced, especially as many miners tend to prefer the most efficient models. However, for those with access to low electricity costs (under $0.065/kWh), the T21 is likely to provide a significantly higher ROI than its more efficient and expensive counterparts, thanks to its lower upfront price.
If you have access to affordable hosting, such as what we offer in Ethiopia, the T21 is likely the best choice for maximizing returns.
Prices fluctuate daily, and you can follow them in our Telegram channel.
conclusion
In conclusion, the Antminer T21 offers a compelling balance of performance, efficiency, and affordability, making it a strong choice for miners with access to low-cost electricity.
While not as efficient as some of the higher-end models like the S21 XP, it delivers an impressive hashrate, solid profitability, and reliable durability.
For miners operating in environments with cheap power and effective cooling, the T21 presents a budget-friendly alternative that can remain cash flow positive for years.
Its competitive price further enhances its appeal, especially in locations like Ethiopia, where electricity costs are favorable.
custom T21 hosting solution
Ready to maximize your Bitcoin mining potential? Our team of experts is standing by to craft a personalized hosting package for your Antminer T21 in our state-of-the-art Ethiopia facility.
Benefit from optimal climate conditions, stable power, and 24/7 professional management. Fill out the form below to receive your tailored offer and take the first step towards unparalleled mining efficiency.
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Frequently Asked Questions
What makes the Antminer T21 a good choice for Bitcoin mining?
The Antminer T21 offers an impressive hashrate of 190 TH/s and operates at 19 J/T efficiency, making it a budget-friendly yet powerful alternative to high-end mining models. It’s ideal for miners with access to low-cost electricity, like our hosting option in Ethiopia.
How much does it cost to mine one Bitcoin with the T21 in Ethiopia?
With Ethiopia’s electricity rate of $0.058/kWh, the T21 achieves a production cost of around $34.8k per Bitcoin, allowing miners to maintain a strong profit margin even as market conditions fluctuate.
What hosting options are available for the T21 in Ethiopia?
Our Ethiopian facility provides reliable hosting at just $0.058 per kWh, ideal for maximizing profitability with the T21. The site operates under optimal air-cooled conditions, supporting the T21’s efficiency and durability.
How does the T21 perform in real-world mining conditions?
In our Ethiopian facility, the T21 has slightly exceeded its nameplate hashrate, averaging 193 TH/s. Although it consumes about 3% more power than expected, it maintains a stable efficiency of 19.3 J/T, demonstrating reliable performance.
What’s the expected ROI with the T21 at the $0.058/kWh rate?
With low hosting costs in Ethiopia, the T21 can deliver an ROI in under 18 months, depending on BTC prices and market conditions, making it an attractive choice for miners seeking value and performance.
How durable is the Antminer T21?
The T21 is designed for long-term use, with a projected lifespan of 4-5 years. With consistent performance and minimal maintenance issues reported in our Ethiopia facility, it’s built to be a reliable, long-term investment.
How does the T21 compare to the S21 or other high-efficiency miners?
While the T21 may not match the efficiency of models like the S21, its lower cost and strong hashrate make it an excellent value for miners with access to affordable electricity, delivering solid returns at a more accessible price point.