Nerdminer V2 vs Antminer S21: a roughly 800-million-fold difference, compared

Comparing a Nerdminer V2 with an Antminer S21 is like putting a child's bicycle up against a Formula 1 car. The hash rate difference is a factor of about 800 million (200 TH/s ÷ 250 kH/s). Running costs differ by a factor of 3,684. Price by a factor of 71. And the comparison is still worth making, because it explains why both devices have a place in the bitcoin world of 2026 while addressing completely different people. This article lays out the real dimensions of both classes and answers which device makes sense in which situation.

The bare numbers

The Antminer S21 in detail

The Antminer S21 is the current bestseller in the professional ASIC segment. Made by Bitmain, the world's largest manufacturer of bitcoin mining hardware, it is the direct successor to the S19 series. The key specifications:

• Hash rate: 200 TH/s (±3 % depending on firmware version)
• Power draw: 3,500 W at full load (17.5 J/TH efficiency)
• Chipset: 132 BM1466 ASICs running in parallel
• Cooling: 4 large axial fans, around 75 dB at full load
• Form factor: 195×290×400 mm, 15.3 kg, rack mountable
• Power supply: integrated, needs 200-240 V three-phase or 2× 110-120 V
• Network: 1 gigabit Ethernet
• List price (as of April 2026): €3,500-4,500 depending on retailer and availability

Why the Antminer S21 does not pay off in Germany

Let us work through the economics concretely. Assumptions: the S21 runs 24/7, the bitcoin price is around €63,000, network hash rate 620 EH/s, German household electricity at €0.32/kWh.

Daily revenue:

• Share of network hash rate: 200 TH/s ÷ 620 EH/s = 0.0000323 %
• 450 BTC are issued daily (144 blocks a day × 3.125 BTC after the halving)
• Expected share: 0.0000323 % × 450 BTC ≈ 0.0000145 BTC/day ≈ about €0.91 a day
• Gross revenue per month: ~€27

Daily cost:

• Consumption per day: 3.5 kW × 24 h = 84 kWh
• Electricity per day: 84 × €0.32 = €26.88
• Electricity per month: ~€810

Monthly result: about €27 of revenue less €810 of electricity = around −€780 a month.

Which means: running an Antminer S21 in a German household at normal electricity prices costs roughly €9,800 a year in electricity alone. The miner itself costs another €3,500-4,500 on top. On German household electricity the S21 is a clear loss maker; it burns electricity instead of producing a profit.

Where the Antminer S21 does make sense

The S21 only becomes profitable at industrial electricity prices below €0.07/kWh. Only a few settings reach that:

• Paraguay with its surplus hydro power (Itaipú), often below €0.04/kWh for mining customers
• Texas with a deregulated market and surplus wind and solar, €0.03-0.06/kWh
• Kazakhstan and Russia with subsidised coal and gas power, below €0.05/kWh
• Bhutan with state-owned hydro, below €0.04/kWh
• German households with solar surplus: if your solar power would otherwise be exported for 6 to 8 cents per kWh, a miner lets you keep it, which effectively reduces the electricity price to the export income you give up

Outside those scenarios the S21 is not an economic device but an expensive toy for well-off bitcoin enthusiasts.

And the Nerdminer V2?

The Nerdminer V2 is the exact opposite of the S21: educationally valuable, irrelevant in electrical terms, mathematically a lottery ticket. The running cost difference: the Nerdminer draws around €0.23 a month, so it effectively runs for free. If it ever hit the jackpot, the return on investment would be four figures. As a lottery ticket, what counts is the chance, not the statistical average.

Noise and space, the overlooked factors

Hash rate numbers dominate every discussion, but in practice noise and space are often the real deciding factor.

Antminer S21:

• 75 dB (comparable to a powerful vacuum cleaner or a lawnmower)
• Absolutely not suitable for a living space; you need a cellar, a garage or a separate outbuilding
• Produces about 12,000 BTU/h of waste heat (a small room heater), usable for heating in winter, a cooling problem in summer
• Needs a dedicated 200-240 V connection or 2 separate 110-120 V circuits

Nerdminer V2:

• Completely silent; a microphone test shows 0 dB above room noise
• Fine in a living room, a bedroom or an office
• No meaningful waste heat (less than a phone while charging)
• Standard USB power, no special power supply

The paradox: both are legitimate

Although the two classes are about 800 million times apart, the Nerdminer V2 and the Antminer S21 are both legitimate bitcoin mining devices, just for completely different purposes:

• The Antminer S21 is capital equipment. It runs in mining farms under industrial conditions, produces measurable revenue and forms part of a business model. Anyone running one privately at home does so out of enthusiasm despite the loss, or has very particular electricity terms.
• The Nerdminer V2 is an educational device. It runs on desks, produces practically no revenue and is part of a learning and experimenting setup. It participates in the bitcoin network as a fully valid miner, but at a level where the economic component is negligible.

Common questions about the comparison

Conclusion

The Antminer S21 is industrial bitcoin infrastructure in rack format. The Nerdminer V2 is a bitcoin education device in desk format. Both are genuine mining hardware, but they answer completely different questions. If you want to mine seriously and for profit, you need industrial electricity and a professional ASIC like the Antminer. If you want to understand mining, play with it and learn from it, a Nerdminer V2 or the slightly stronger NerdNOS serves you well. Most private customers in Germany fall into the second group.