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Machine review · Oct 27, 2026 · 6 min read

Antminer S19 XP Hyd review: 20.8 J/TH on water at $3 a terahash, and Nigeria pays best

Bitmain's S19 XP Hyd is a water-cooled machine that makes 257 TH/s from 5,345 W, at one of the lowest prices per terahash we list. On water in the UAE it clears its power with a thin margin today. At Nigeria's 3.9¢ it clears it by a wide one.

Firsthand card: "Antminer S19 XP Hyd review: 20.8 J/TH on water at $3 a terahash, and Nigeria pays best", with the store photograph of the Antminer S19 XP Hyd, 20.8 J/TH, 257 TH/s, water-cooled

Bitmain Antminer S19 XP Hyd (257 TH/s)

The bottom line

The S19 XP Hyd is Bitmain's water-cooled 257 TH/s machine: 5,345 W, 20.8 J/TH. In the UAE, at 6¢, it makes a bitcoin for about $72,600 of electricity and returns roughly 12% in its first year at today's price. At Nigeria's 3.9¢ the same coin costs about $47,200 and year one is 40%.

Bought once its price settled, in October 2023, it has mined and kept 0.2163 BTC for $8,125 of power: $9,186 of cashflow against a $6,880 landed cost, 134% of the box in 1,091 days. It spent 869 days in the UAE and crossed to Nigeria on 20 March 2026. Between now and the 2028 halving it has another 0.046 BTC in it, worth about $5,720 with bitcoin back at its previous high of $124,493.

What you are buying is hashrate on water at a very low price per terahash: $3.05 today, against $3.99 for the S19 XP+ Hyd and $6.93 for the S21+ Hyd. What you pay for it is electricity. The case is a cheap box and cheap power, not the efficiency.

Scores

CriterionScoreWhy
Cashflow4.5/10Makes a bitcoin for about $72,600 of electricity at 6¢ and about $47,200 at 3.9¢, and returns roughly 12% in year one in the UAE and 40% in Nigeria. It has covered 134% of its hardware so far. The S21+ Hyd returns about 39% in the UAE.
Longevity3/10At 20.8 J/TH its line is $29.95 a petahash a day at 6¢ and $19.47 at 3.9¢. Half of 26 October's hashprice, $17.97, is under both, so after the halving it needs power at or below about 3.6¢.
Efficiency2.5/1020.8 J/TH against 19 for the S19 XP+ Hyd, 15 for the S21+ Hyd and 12 for the S21j XP Hyd, near the back of the water-cooled machines we stock.
Quality control5/10Scored as unknown rather than as good. We found no operator reports for the S19 XP Hyd that we could cite, and a repair shop's guide is a troubleshooting reference, not a failure rate.
Serviceability6.5/10Water-cooled, so it lives in the UAE, where a manufacturer warranty centre is close to the facility and the water plant already exists. The model's manuals and a repair trade's guides are public.

Cashflow and efficiency count most, because they decide how many halvings a machine clears. Reliability is scored as unknown, not as good, so it holds the total down.

Buy it if

Walk away if

Bitmain's first water-cooled S19 XP, still on water at 20.8 J/TH

Bitmain unveiled the S19 XP Hyd in March 2022. ForkLog reported on 14 March 2022 that it was rated 255 TH/s from 5,304 W, 20.8 J/TH, and that Bitmain showed a container, the Antspace HK3, built to hold up to 210 of the water-cooled units.

The bin we list is 257 TH/s from 5,345 W, 20.8 J/TH, hydro-cooled, 410 × 170 × 209 mm. A repair shop's spec page gives the same 257 TH/s and about 5,346 W, with a coolant inlet of 20 to 40 °C at 8 to 10 litres a minute, and a three-phase supply of 380 to 415 V that is not compatible with the 200 to 240 V of the air-cooled S19 family. Bitmain's own product page could not be opened, so these specs are our store record checked against those two sources, and we leave out the weight, where our record and the repair shop disagree.

It is the same chip generation as the air-cooled S19 XP at 21.35 J/TH, and well behind the S19 XP+ Hyd at 19. What this machine has done at our sites is in its look-back.

Chart: Coins kept since the first settled price we hold for it, the electricity that made them, and where it lands by the 2028 halving.

A water-cooled box at about $3 a terahash

The 257 TH/s unit is $783 today, $3.05 a terahash. The first price we hold for it, on 14 August 2023, was $25.20 a terahash. The lowest we hold is $2.57 a terahash, on 8 July 2026, so today's price is close to the best entry price it has had. The hashrate is the same as it was in 2023.

A purchase once the price settled, in October 2023, cost $5,505, and $6,880 landed at our UAE site once freight, customs and setup were added. Beside the three water-cooled machines it most often competes with it is the cheapest per terahash: the S19 XP+ Hyd is $3.99, the S21+ Hyd $6.93 and the S21j XP Hyd $11.55. The guide to what a miner costs all-in shows what sits on top of the box before it is running.

Chart: What the 257 TH/s unit has cost, from the first price we hold for it in August 2023.

What a coin costs it, and what year one returns

In the UAE, at 6¢, the S19 XP Hyd makes a bitcoin for about $72,600 of electricity today, against a bitcoin price of $79,541. At Nigeria's 3.9¢, with Nigeria's lower uptime already counted, the same coin costs about $47,200. The S21+ Hyd makes one in the UAE for about $52,200 and the S21j XP Hyd for about $41,800.

In its first year the S19 XP Hyd returns about 12% in the UAE and 40% in Nigeria at today's price and difficulty. The S21+ Hyd returns 39% in the UAE and the S21j XP Hyd 40%. The gap between this machine's two figures is the point: at 20.8 J/TH it is built for cheap power, and a cheap box does most of the work when power is cheap.

A machine starts at its home site and crosses once, when a year of figures says so. The one in our run crossed after 869 days, on 20 March 2026. Over its run since October 2023, electricity has averaged about $37,600 a coin: a lifetime figure, mostly at 6¢ before the move, and not the one to plan on. The figure to plan on is today's.

Chart: What a coin costs it in electricity against bitcoin's price. The gap between the lines is the cashflow.

Where the halving puts it

A machine's line is the hashprice at which it stops covering its own power. At 20.8 J/TH a petahash uses 499 kWh a day: $29.95 at 6¢ and $19.47 at Nigeria's 3.9¢. Network hashprice was $35.93 per petahash per day on 26 October on our hashprice chart, so the S19 XP Hyd clears the 6¢ line by $5.98 and Nigeria's by $16.46. In a day, a 257 TH/s machine earns about $9.23 at that hashprice and spends $7.70 on power at 6¢, or $5.00 at 3.9¢, before uptime. The most it can pay for power and still clear today is about 7.2¢ a kilowatt-hour.

The 6¢ line has been crossed. Since the April 2024 halving, hashprice has been under $29.95 on 37 of 920 days, all of them in 2026: 9 in February, 6 in March, 14 in June and 8 in July. The low was $27.74 on 6 June 2026, $2.21 under the line. On no day has it been under Nigeria's $19.47.

The 2028 halving halves the coins a petahash earns. At today's price and difficulty that puts hashprice near $17.97, under the 6¢ line and $1.50 under Nigeria's. At that hashprice the machine clears power at rates up to about 3.6¢. That is today's conditions held flat, not a forecast: it is why every projection we publish assumes the old high returns, and the forward figures here do the same. The S19 XP Hyd is a machine for the run to April 2028, and after it a machine for power at or below about 3.6¢, or for a hashprice above today's.

The guide to efficiency and halvings shows where the line sits at every J/TH, and the guide to crossing once explains why the move to Nigeria is made one time.

Chart: Network hashprice per petahash per day. The S19 XP Hyd needs about $30 of it at 6¢ and about $19 at 3.9¢; the dips under the first line are February, March, June and July. Open the chart

What a fault costs you here

We looked for operator threads on the S19 XP Hyd and found none we could stand behind. What exists comes from a repair shop. D-Central's hydro troubleshooting guide, which names the S19 XP Hydro among the models it covers, says a red fault light often points to "coolant over-temperature or low flow", and warns that a running pump does not guarantee flow, since a closed valve or an air lock can starve a board. It says a board that stays at zero hashrate after flow is confirmed "needs board-level work".

The shop's spec page says the machine should never be energised "without validated circulation, heat rejection, leak detection". A repair shop sells repairs, so we treat both as a troubleshooting reference and not a failure rate, and the S19 XP Hyd is scored as unknown on quality control.

What a fault costs is the part that matters. In the UAE a manufacturer warranty centre is close to the facility, so a unit still under warranty goes direct, and a water-cooled unit is serviced where the plant already exists: a failed hashboard is a line item, not a catastrophe. The coolant loop is the reason the machine lives there, and the guide to cooling explains what water changes.

We found no operator reports of the S19 XP Hyd we could cite. We score that as unknown, not as good.

Chart: Scored on what costs an owner money over a four-year life. Reliability is scored as unknown.

Our two cents

The S19 XP Hyd is among the cheapest ways into water-cooled hashrate that we list. At Nigeria's 3.9¢ it clears its power today by a wide margin. At 6¢ in the UAE it clears today with a thin margin and leans on bitcoin recovering afterwards, and it has already sat under that line for weeks in 2026.

A buyer who wants the cheapest coin should look up: the S21+ Hyd makes one in the UAE for about $52,200 against about $72,600 here, at a first-year return of 39%. The figure below ranks what beats this machine on cost per coin and then on year-one return, in stock today. A coin that costs less to make is a coin you keep more of.

What beats it on cost per coin and on first-year return, in stock today.

Sources and further reading

Which machines this covers

The other side of this machine

The S19 XP Hyd made the cheapest coin of its whole generation — The cheapest bitcoin of anything from its era we have measured. Three years of a hydro machine that nobody was watching.

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.