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Machine review · Nov 11, 2026 · 7 min read
Antminer S23 XP Hyd review: 8.9 J/TH on water, the cheapest coin in stock at the dearest terahash
Bitmain's S23 XP Hyd is a water-cooled 600 TH/s machine at 8.9 J/TH, the first Antminer rated under nine joules, and it started shipping this month. It makes the cheapest bitcoin of anything in our store and asks the most per terahash. Its line sits so low that half of today's hashprice still clears it at 6¢.
Bitmain Antminer S23 XP Hyd (600 TH/s)
The bottom line
The S23 XP Hyd is Bitmain's water-cooled flagship at 8.9 J/TH: 600 TH/s from 5,340 W. Racked at the UAE's 6¢ it makes a bitcoin for about $32,700 of electricity today, against a bitcoin price of $74,198, and its first year at today's price and difficulty returns about 21%. At Nigeria's 3.9¢, with that site's lower uptime already counted, the same coin costs about $21,300 and the first year returns 17%.
We hold a price for it since September and it has run in the UAE since September 2026: 0.0180 BTC kept for $541 of power in 65 days, $812 of cashflow against a $18,325 landed cost, which is 4% of the box and what the first weeks of a four-year life look like. Between now and the 2028 halving it has another 0.134 BTC in it, worth about $16,651 with bitcoin back at its previous high: roughly 1.0× its hardware covered by the halving, with the machine still running.
What you are buying is distance from the line. At 8.9 J/TH a petahash costs $12.82 a day to run at 6¢ and $8.33 at 3.9¢, and hashprice has not been within $15 of the first figure since the 2024 halving. The reason to hesitate is the price per terahash, $26.36 today, the highest in our water range. The reason not to is that every cheaper machine in that range is closer to its line than this one, and the halving moves every line up.
Scores
| Criterion | Score | Why |
|---|---|---|
| Cashflow | 7/10 | Makes a bitcoin for about $32,700 of electricity at 6¢ and about $21,300 at Nigeria's 3.9¢, the cheapest coin in the store. Year one at today's price is 21% in the UAE, held back by a box at $26.36 a terahash; the S23e Hyd 2U's year one at 6¢ is 40%. |
| Longevity | 10/10 | At 8.9 J/TH its line is $12.82 a petahash a day at 6¢ and $8.33 at 3.9¢. Half of today's hashprice, $16.05, clears both, so at today's conditions held flat it still covers its power at 6¢ after the April 2028 halving. No other machine in our water range at 12 J/TH or above does. |
| Efficiency | 10/10 | 8.9 J/TH is the best figure of any machine we stock, 6% better than the S23 Hyd's 9.5 and a quarter better than the S21 XP Hyd's 12. Bitmain rates it at a 35 °C coolant inlet; a few percent either way is what field time will tell us first. |
| Quality control | 5/10 | Unknown, not good. Shipping began this month, the Bitcointalk launch thread had no owner reports as of October, and there is no repair writing on these boards yet. It is a score, not a warning: the UAE has a manufacturer warranty centre close to the facility. |
| Serviceability | 7/10 | A Bitmain hydro machine in the same chassis shape as the S23 Hyd, with the manufacturer's twelve-month warranty and a warranty centre near our UAE site. The repair market has not reached it yet; the S21 generation's guides and parts do not carry over to a new chip. |
Efficiency and longevity count most, because at 8.9 J/TH this is the one machine whose line sits under half of today's hashprice at 6¢. Quality control is scored as unknown, not as good, because shipping began this month and nobody has run one for a year.
Buy it if
- Your power is at or below about 7.5¢ and you plan past the April 2028 halving. At 8.9 J/TH a petahash uses 213.6 kWh a day, so its line is $16.02 at 7.5¢, level with half of today's hashprice of $32.10.
- Your power is between 7.5¢ and 15¢ and you are buying for the run up to the halving. Its line at 15¢ is $32.04, so it clears today at every rate under that, and the margin widens as the rate falls.
- Your site is power-limited rather than money-limited. A megawatt of these carries about 112 PH/s; a megawatt of 13.5 J/TH machines carries about 74. Efficiency is hashrate when the connection is the scarce thing.
- You want the machine with the most runway in the water range. At 6¢ it clears half of today's hashprice by $3.23; the 12 J/TH machines do not clear it at all.
Walk away if
- Your power is above about 15¢. The line is $32.04 a petahash a day there, and hashprice was $32.10 on 10 November, so at any dearer rate it does not cover its own electricity today.
- You want the best first-year return on the money. The [S23e Hyd 2U](/blog/antminer-s23e-hyd-2u-suspiciously-cheap) at 10 J/TH asks $11.13 a terahash against $26.36 for this, and its year one at 6¢ is 40% against 21%.
- You cannot run a water loop. This is a hydro machine with coolant at 20–50 °C; there is no air-cooled version, and the best air machines sit at 10.9 to 13.5 J/TH.
- You want a field record before you buy. Shipping began this month and the launch thread has no owner reports; quality control is scored as unknown.
The first Antminer under 9 J/TH, shipping from this month
Bitmain unveiled the S23 XP Hyd in Hong Kong at the end of August; we wrote the outlook the week it was announced, and the launch thread on Bitcointalk opened on 28 August with the same two numbers everyone repeated: 600 TH/s and 8.9 J/TH. Our store record has it at 5,340 W, water-cooled, 410 × 170 × 209 mm and 15.8 kg, with a coolant window of 20–50 °C. Bitmain's own pages did not render for us, so the store record is the spec source here and we leave out anything it does not hold.
The November batch is in stock, and the first price we hold for it is from 1 September, at $27.56 a terahash, $16,538 for the box. By 21 September it was $26.36, and it is $15,813 today, $26.36 a terahash. A water machine starts in the UAE, at 6¢ and 99.3% uptime, beside the water plant and the manufacturer's warranty centre, and crosses once to Nigeria's 3.9¢ when a year of figures says cheaper power pays better. That rule is in the guide to crossing; this machine is a long way from needing it.
The dearest terahash in the water range
At $26.36 a terahash the S23 XP Hyd asks more than any other water machine we stock. The S23 Hyd at 9.5 J/TH asks $23.52, the S23e Hyd 2U at 10 J/TH asks $11.13, and the S21j XP Hyd at 12 J/TH asks $11.55. The premium buys 0.6 of a joule over the S23 Hyd and about three joules over the S21 generation.
A price per terahash settles after launch. The S23 Hyd and the S21 XP Hyd both became meaningfully cheaper in their first year, and the S23 XP Hyd has already moved from $27.56 to $26.36 since September. Buying now is paying for being early; for an owner planning to run it for five years that premium is spread thin, and for anyone else it is the reason the cheaper S23 machines exist.
At 3.9¢ it makes a coin for about $21,300
At Nigeria's 3.9¢ the S23 XP Hyd makes a bitcoin for about $21,300 of electricity today, and at the UAE's 6¢ for about $32,700, against a bitcoin price of $74,198. Those are electricity-only figures at today's difficulty, with each site's uptime counted. The S23 Hyd makes one in the UAE for about $34,900, the S23e Hyd 2U for about $36,200 and the S21j XP Hyd for about $43,900.
In its first year at today's price and difficulty the return is 21% in the UAE and 17% in Nigeria. The S23e Hyd 2U returns 40% at 6¢ on the same day, because its box costs less per terahash and the extra joule costs less than the difference. That is the honest shape of this machine: the cheapest coin, not the fastest first year. Over its short run so far electricity has averaged about $30,100 a coin; the figure to plan on is today's.
Where the halving puts it
A machine's line is the hashprice at which it stops covering its own power. At 8.9 J/TH a petahash uses 213.6 kWh a day: $12.82 at 6¢ and $8.33 at Nigeria's 3.9¢. On our hashprice chart, network hashprice was $32.10 a petahash a day on 10 November, so the machine clears the 6¢ line by $19.28 and Nigeria's by $23.77.
Since the 2024 halving, hashprice's lowest day was $27.74, on 6 June 2026. It has never been within $14 of this machine's 6¢ line. We counted how a 19 J/TH line fared over the same stretch in a separate piece; at 8.9 the question does not arise.
The 2028 halving halves the coins a petahash earns. At today's price and difficulty that puts hashprice near $16.05, which still clears this machine's 6¢ line by $3.23 and Nigeria's by $7.72. The S23 Hyd's 6¢ line is $13.68 and the S23e Hyd 2U's is $14.40, so both clear too, by less. The 12 J/TH machines have a 6¢ line of $17.28, above it. That is today's conditions held flat, not a forecast: every projection we publish assumes the old high returns. What it shows is the rate band: about 7.5¢ is the highest power price that still clears across the halving on this machine, and efficiency decides how many halvings a machine survives.
Half of today's hashprice is $16.05. This machine's line at 6¢ is $12.82. No other water machine at 12 J/TH or above clears that.
What a fault costs you here
There is no failure record, because there are no old units. The launch thread had no owner reports when we read it, and the repair guides written for the S21 generation's boards do not describe this chip. So quality control is scored as unknown rather than as good, and the serviceability score says the same: a new board has no bench history. That is a score, not a warning, and the guide to repairs explains why a fault is a line item on a hosted machine.
What a fault costs is the part that matters. Hosted in the UAE, a manufacturer warranty centre sits close to the facility, so an in-warranty unit goes direct, and the manufacturer's twelve-month warranty covers the whole of the first year. The guide to cooling explains what a water loop changes about day-to-day running.
Our two cents
The S23 XP Hyd is the machine to buy for the halving after this one. At 8.9 J/TH it makes a coin for about $21,300 at 3.9¢ and about $32,700 at 6¢, and its line sits far enough under hashprice that half of today's level still clears it at the water site's rate. Nothing else we stock at 12 J/TH or above can say that.
If the aim is the fastest first year, the S23e Hyd 2U at 10 J/TH returns 40% at 6¢ against 21% for this, on a cheaper box. If the aim is a machine that is still worth switching on in 2029, this is the one, and the price per terahash is the cost of being early to it.
Sources and further reading
- ANTMINER S23 XP Hyd - 600Th/s (launch thread) — Bitcointalk, 28 Aug 2026
- Hashprice — Firsthand Bitcoin data, 10 Nov 2026
Which machines this covers
The other side of this machine
The Antminer S23 XP Hyd is the first Antminer under 9 J/TH. Who is it for? — Unveiled in Hong Kong in August and shipping from November, it will make the cheapest bitcoin of any machine Bitmain has announced. It also costs more per terahash than almost anything else we would put in the same room. Both facts are the point.
Disclosure
Firsthand Bitcoin sells and hosts mining hardware, including this machine. No manufacturer, distributor or affiliate programme paid for or reviewed this page and we take no commission on the links above. Historical figures are computed from daily bitcoin price and network hashprice, each day valued at its own prices. Nothing here is investment advice.