Pencil drawing of the Bitdeer SEALMINER A3 Air

Industrial Industrial (air) Rack / shelf Pre-order

Bitdeer SEALMINER A3 Air

The standard air-cooled model of the A3 series, announced in September 2025. Bitdeer rates it at about 260 TH/s and 3,640 W (14 J/TH) on 220–277 V. Bitdeer lists it as pre-order with no price; resellers take futures orders.

Best price $3,999

$15.38 per TH · New · Pre-order at Apexto

Reviews from Nostr ↓

Hashrate260 TH/s worst 250 GH/sbest 1.16 PH/s 73rd best of 197 (the bar uses a log scale)
Power (stock)3,640 W lowest 11 Whighest 22 kW 98th highest of 199 (the bar uses a log scale)
Efficiency14 J/TH worst 100 J/THbest 8.9 J/TH 38th best of 195
Earns per kWh$0.108 worst $0.010best $0.171 42nd best of 195
Heat output12,420 BTU/h worst 38 BTU/hbest 75,067 BTU/h 98th best of 199 (the bar uses a log scale)
Noise—
Price per TH$15.38 worst $539.96best $1.82 81st best of 156 (the bar uses a log scale)

Where to buy

Store Trustpilot Condition Availability Listed price In your currency Per TH Checked Link
Apexto Listed as Futures. Price from Apexto category listing (shown with $). Apexto lists warehouses in Hong Kong and the US. TrustScore 4.5 out of 5, 167 reviews New Pre-order $3,999 $3,999 $15.38 4 Nov 2026 Visit
Altair Technology "Early Production Units, October Future", ship date TBD; page shows both Add to cart and Notify me. Altair says the price includes all US tariffs and import duties for US buyers; the description says brand new in box although the attribute table says "Used". These notes are from 4 Nov 2026. Price and stock were checked since. TrustScore 4.7 out of 5, 623 reviews New Pre-order $4,499 $4,499 $17.30 12 Nov 2026 Visit

Prices as listed on each store's page on the date shown, without shipping. Prices marked excl. tax leave out VAT or sales tax, and others may too. Per TH uses the hashrate of the unit each store sells. Converted at ECB rates of 11 Nov 2026. Trustpilot scores are for the store, not the device. Each store's name opens its page, with everything it sells and its reviews.

Heat, running cost and sats

Heat per day
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Electricity per day
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Mining earns per day*
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Net cost per day
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Net cost per kWh of heat
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Solo: chance of a block per year
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Earns per kWh, on 3-month averages
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Payback
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*What a pool would pay on average at today's difficulty, block reward and bitcoin price, before pool fees. Solo miners usually earn nothing, and very rarely a whole block. A plain electric heater turns the same electricity into the same heat, so the mining income is what makes the difference.

Payback is how long the bitcoin a device earns takes to add up to its price. It leaves out electricity, which buys the heat: compare earnings per kWh with your electricity price to see whether mining alone covers it. It uses the average of the last 3 months, to 12 Nov 2026: bitcoin at $79,558, 969 EH/s on the network and 3.15 BTC a block, less a 2% pool fee, for the hours you set. It cuts the block subsidy in half at each halving, the next around Apr 2028, and otherwise assumes those carry on unchanged, which they won't. Income at today's difficulty and price is about 17% below that average. Hashrate usually rises, though miners that stop paying after a halving may switch off, which leaves more for the rest. How we work it out.

Specifications

BrandBitdeer
ModelSEALMINER A3 Air
SKU—
TypeIndustrial (air) · Industrial
Form factorRack / shelf
CoolingAir
Production statusPre-order
Launch dateSep 2025
Hashrate260 TH/s
Power consumption (stock)3,640 W
Mining efficiency14 J/TH
ASIC chipBitdeer SEAL03 (named by the device's maker)
Heat output12,420 BTU/h
Input voltage220–277 V AC
Frequency50/60 Hz
Net dimensions (W × D × H)197 × 365 × 292 mm (7.8 × 14.4 × 11.5 in)
Net weight15.5 kg (34.2 lb)
Noise—
Operating temperature-20–45 °C (-4–113 °F)
Area heatedAbout 24–73 m² (our estimate)
Colours—
Company based inSingapore
Made in—

* Not confirmed by the maker's own documents yet.

Features

  • Air cooled
  • PA45-4P-S power connector
  • RJ45 Ethernet

Reviews

Reviews are posted on Nostr, so they belong to the people who wrote them, not to us. Sign in with a Nostr extension or signer app to add yours.

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Sources and data notes

Not yet confirmed from the maker's own documents: noise; where it's made; colours.

Spotted a mistake? Let us know.