Antminer S21 XP Hydro — Mining Profitability
Overview
The Antminer S21 XP Hydro is Bitmain's October 2024 hydro-cooled high-density miner, delivering 473 TH/s at 12 J/TH and 5,676 W. It launched as the hydro counterpart to the air-cooled S21 XP, giving operators access to ~75% more hashrate per chassis at slightly worse efficiency in exchange for the hydro loop's superior thermal headroom and density. The S21 XP Hydro fits industrial datacenter, container farm, and large hosting deployments that already operate hydro infrastructure. Within the Bitmain hydro lineup it sits below the S21e XP Hyd (860 TH/s, 13 J/TH) and the S23 Hydro (580 TH/s, 9.5 J/TH). On the secondary market it offers attractive $/TH for buyers who want hydro economics without the latest-gen premium pricing.
See the glossary →Specifications
Hashrate
473 TH/s
Power
5,676W
Efficiency
12 J/TH
Cooling
Hydro
Release Date
October 2024
Est. $/TH
$23.0/TH
Manufacturer
Bitmain
Live Profitability
Halving 2028 impact
The April 2028 halving cuts the block subsidy from 3.125 to 1.5625 BTC, mechanically halving the hashprice. At today's hashprice ($38/PH/day), the Antminer S21 XP Hydro at 0.473 PH/s generates ~$18/day in gross revenue. Post-halving, that drops to ~$9/day at constant BTC price. Break-even electricity tightens from ~$0.131/kWh today to ~$0.066/kWh post-halving. At 12 J/TH the S21 XP Hydro stays viable post-halving on industrial-rate power; sites with hydro infrastructure can typically run it well into 2029 if their power contract is at $0.05/kWh or below.
See halving countdown →Compare with similar models
Sealminer A3 Pro Hyd
660 TH/s · 12.5 J/TH · Hydro
Antminer S21e XP Hyd
860 TH/s · 13 J/TH · Hydro
Sealminer A3 Hyd
500 TH/s · 13.5 J/TH · Hydro
Frequently asked questions
Is the Antminer S21 XP Hydro profitable today?▾
At the current hashprice ($38/PH/day), the S21 XP Hydro generates ~$18/day in gross revenue. Net profitability depends on your hydro operating cost: with a well-tuned loop and electricity at $0.04/kWh, you keep a strong margin; at break-even ($0.131/kWh) you clear zero; above that, you lose. Most industrial hydro sites operate at $0.04–0.06/kWh equivalent, putting the S21 XP Hydro in healthy margin territory.
What's the break-even electricity cost for the Antminer S21 XP Hydro?▾
At the current hashprice ($38/PH/day), break-even sits at ~$0.131/kWh. The formula: daily revenue (0.473 PH/s × hashprice) divided by daily energy consumption (5.676 kW × 24h = 136 kWh) gives the kWh price at which gross revenue equals electricity cost. Apply 2% pool fee and the practical ceiling drops slightly. After the 2028 halving, break-even tightens to ~$0.066/kWh.
How does the 2028 halving affect the Antminer S21 XP Hydro?▾
The halving halves the hashprice. For the S21 XP Hydro at 0.473 PH/s, gross daily revenue drops from ~$18 to ~$9 at constant BTC price. Break-even electricity tightens from ~$0.131/kWh to ~$0.066/kWh. At 12 J/TH the machine stays viable post-halving on industrial hydro; the typical exit threshold is sites where power costs above $0.06/kWh, beyond which the post-halving margin disappears.
What's the lifespan of an Antminer S21 XP Hydro?▾
Hydro-cooled ASICs last 4–6 years of continuous operation in a properly maintained loop (filtered coolant, stable inlet temperature, leak monitoring). The S21 XP Hydro launched October 2024, putting deployed units in their 2nd year. Hardware rarely fails first; economic obsolescence does. Plan a 4-year productive window with the 2028 halving as the inflection point — operators with sub-$0.05/kWh hydro can run it into late 2028 or 2029.
Antminer S21 XP Hydro vs Antminer S23 Hydro — should I upgrade?▾
The S23 Hydro delivers 580 TH/s at 9.5 J/TH versus 473 TH/s at 12 J/TH for the S21 XP Hydro — about 21% better efficiency and 23% more hashrate per chassis. Upgrading makes sense above $0.05/kWh: the energy savings recover the price gap within 18–30 months and provide a comfortable post-halving margin buffer. Below $0.04/kWh, the S21 XP Hydro stays competitive through 2028. The decision is mostly an electricity-cost calculation, not a hardware preference.