The calculator from our free widget: every payback on this page follows it.
Income a day
$12.36
Power a day
−$4.43
Hosting a day
—
Profit a day
$7.93
Payback at $2,099
—
Profit and payback are estimates from today's coin prices and network difficulty, before pool fees, hosting and taxes. They change every day. Not financial advice.
Rankings use the algorithm's main coin (BTC for SHA-256, LTC + DOGE for Scrypt): small side chains may pay more per hash today but can't absorb much hashrate.
The Bitmain Antminer S21+ Hyd (338Th) is an ASIC miner by Bitmain for the SHA-256 algorithm, rated at 338 TH/s on 5,070 W. It came out in August 2025. At 15.0 J/TH it is 26% more efficient than the median SHA-256 miner we track (20.4 J/TH). At $0.036/kWh it ranks #54 of 299 SHA-256 miners by daily profit, earning about $7.93 a day mining BTC. The best price on AsicProfit is $2,099. At today's rates it would pay for itself in about 265 days. It is water-cooled (hydro), so it needs a cooling loop and a dry cooler instead of fans.
Questions and answers 6
Ask about this miner. Verified accounts ask and answer, sellers answer as their store, and every post is checked before it shows.
Mikkel J. · Oct 19, 2026 · about another version
What is the difference between the S21+ air versions and the S21+ Hyd versions on this page?
AsicProfit SupportAsicProfit · Oct 20, 2026
They are different machines. The air-cooled S21+ runs on single-phase 220 to 277 V with fans. The S21+ Hyd is water cooled and needs a three-phase 380 to 415 V supply, a coolant loop with 8 to 10 L/min of flow, and a dry cooler or similar heat exchanger. In return the Hyd gives much more hashrate per unit, and Bitmain rates the 358 TH/s Hyd at 15 J/TH. The numbers in each version name are the rated hashrate bins.
Andrus T. · Oct 14, 2026 · about another version
What water do I put in the S21+ Hyd loop? Can I just use tap water?
AsicProfit SupportAsicProfit · Oct 14, 2026
Do not use tap water. Bitmain lists antifreeze, pure water or deionized water as working coolants, each with its own pH window: antifreeze 7.0 to 9.0, pure water 6.5 to 7.5, deionized water 8.5 to 9.5. Keep the inlet between 20 and 50 C, flow at 8 to 10 L/min and pressure at or below 3.5 bar. Where frost is possible, Bitmain says to use antifreeze rather than pure water.
Pablo G. · Oct 6, 2026 · about another version
My S21+ mines for a few minutes then stops and shows a board error. Is it dead?
AsicProfit SupportAsicProfit · Oct 6, 2026
Not necessarily. Owners on Bitcointalk report this with S21+ units and often trace it to one hashboard, a loose data or power connection, or damage from rough shipping. Test one board at a time: power down, disconnect one board's data cable and power, and see whether the rest run. Check the kernel log for chip counts on each chain. If the unit is still under warranty, contact the seller before opening it.
Chris E. · Sep 30, 2026 · about another version
What warranty comes with an S21+? I'm not buying straight from Bitmain.
AsicProfit SupportAsicProfit · Sep 30, 2026
Bitmain gives 365 days from the shipping date on the S21+ and S21+ Hyd, but only to the original buyer who bought directly from Bitmain. If you buy from a reseller, the reseller is responsible for the warranty, so ask them for the terms in writing before paying. Running the miner outside Bitmain's specified conditions, or changing settings without approval, can void cover.
Tomas K. · Sep 29, 2026 · about another version
how loud is the S21+ really? thinking of putting one in my garage
AsicProfit SupportAsicProfit · Sep 29, 2026
Bitmain rates the air-cooled S21+ at 76 dBA at full fan speed, which is about as loud as a busy vacuum cleaner and runs around the clock. A detached garage or outbuilding works for many owners, but it is too loud for living space. Owners on forums say enclosures and ducting can take some of the edge off, but every enclosure still has to move a lot of air, so heat and airflow must come first.
Jan D. · Sep 15, 2026 · about another version
Can I plug the air-cooled S21+ into a normal wall socket, or do I need something special?
AsicProfit SupportAsicProfit · Sep 16, 2026
You need a 220 to 277 V single-phase supply. Bitmain lists a maximum input current of 20 A for the 216 TH/s unit, so plan a dedicated circuit sized for it rather than a shared household socket. The machine ships with a C20 power cord. A 110 to 120 V outlet will not work, and Bitmain warns that the wrong input voltage can damage the unit. Have an electrician check the circuit, breaker and plug before you switch it on.
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