335 TH/s SHA-256 at 5,360W with hydro cooling. Previous flagship hydro Bitcoin miner from Bitmain.

How does it compare to S23 Hydro?

S23 Hydro: 580 TH/s at 9.5 J/TH. S21 Hyd: 335 TH/s at 16 J/TH. The S23 Hydro is significantly more efficient. The S21 Hyd may be available at lower cost.

Does MillionMiner offer hosting?

Yes. Hydro hosting from $0.055/kWh. Free DDP shipping.

Antminer S21 Hyd 335TH Bitcoin Miner

Name: Bitmain Antminer S21 Hyd (335Th) Antminer S21 Hydro 335T
Brand: Bitmain
SKU: MM2026BITMAINANTMINERS21HYD335
Price: 3299.00 USD
Availability: InStock
Rating: 4.9 (16 reviews)

Period	Daily	Weekly	Monthly
Income	$12.54	$87.78	$376.20
Electricity	-$10.29	-$72.03	-$308.70
Profit	$2.25	$15.75	$67.50

Period

Daily

Weekly

Monthly

Income

$12.54

$87.78

$376.20

Electricity

-$10.29

-$72.03

-$308.70

Profit

$2.25

$15.75

$67.50

Bitmain Antminer S21 Hyd 335TH Efficient Hydro Cooled SHA-256 Bitcoin Miner

Water cooled S21 on universal voltage with specifications that split the difference between the newer S21 XP Hydro (473 TH/s, 5,676W, 40 dB) and the older S19 hydro models. The S21 Hyd at 335 TH/s and 5,360W delivers 16.0 J/TH at 50 dB on 100 to 240V single phase. What makes this relevant in a market with the S21 XP Hydro? Price. If the S21 Hyd costs meaningfully less per unit while sharing the same hydro infrastructure, it fills rack positions at lower capital. Both are universal voltage. Both are water cooled. The S21 XP produces 41 percent more hashrate at 6 percent more power, so it wins on efficiency. The standard S21 Hyd wins on acquisition cost when the discount is steep enough. 5,360W water cooled at 50 dB. Closed loop water or water glycol. Standard plumbing. Each unit adds roughly 5.4 kW to your cooling load. No internal fans. 50 dB from external pumps and heat exchangers. The single phase hydro window matters here too. The S23 Hyd requires 380V+ three phase. Both the S21 Hyd and S21 XP Hydro maintain universal voltage compatibility. When this inventory depletes, single phase Bitmain hydro mining hardware disappears from the new market. Daily electricity at $0.07 per kWh: $9.00. Monthly: $270. Bitmain Antminer firmware. Ethernet. 5 to 40 degrees Celsius. For buyers evaluating this specific model: 335 TH/s at 16.0 J/TH produces roughly 335 / 15.0 = 22.3 fewer terahashes worth of Bitcoin per day compared to the S21 XP at 12.0 J/TH. Multiply that gap by your deployment period to calculate the total efficiency penalty. The S21 Hyd only wins when the per unit price discount exceeds that cumulative efficiency cost over your planned operating horizon.

Antminer S21 Hyd 335TH Efficient Hydro Bitcoin Miner

S21 Hyd at 335 TH/s and 5,360W on universal 100 to 240V. More hashrate than the S21+ Hyd (319 TH/s) while maintaining single phase power. 50 dB water cooled. One of the highest output universal voltage hydros from Bitmain.

Hydro cooled at 50 dB. Bitcoin, Bitcoin Cash, all SHA 256. Bitmain firmware. 410 x 170 x 209mm at 14.5 kg. Ethernet. 5 - 45 °C.

Moderate 50 dB works in dedicated rooms without specialized isolation.

Bitmain firmware for pool configuration and monitoring. Evaluate pricing against competing models. Total deployed hashrate determines total coins mined.

Moderate 50 dB means a dedicated room absorbs the sound. Home offices, basements, garages work. Not disruptive through walls.

Bitmain firmware for management. Evaluate pricing against competing models at this hashrate tier. Total fleet hashrate determines coins mined.

Antminer S21 Hyd 335TH BTC Miner

Moderate noise SHA-256. 335 TH/s from Bitmain at 5360W and 50 dB. 100-240V. 14.5 kg. Bitcoin, Bitcoin Cash, all SHA 256. Ethernet. Bitmain. Compare pricing. Total cost of ownership determines value at your electricity rate. Factor acquisition and deployment duration. Model profitability at your electricity rate. Bitmain firmware and support ecosystem. Compare with competing models at this tier. Evaluate acquisition cost plus daily electricity over deployment period.

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