The A2 Pro Air needs 7.66p power.
The cheapest half-hour was 28.69p

The Bitdeer SEALMINER A2 Pro Air needs electricity at 7.66p per kilowatt hour to cover its power bill. The cheapest half-hour on Octopus Agile in Eastern England today was 28.69p; the cheapest anywhere in Great Britain was 27.17p. There is no hour at which this machine makes money on a British domestic tariff, and that is the review.

It is a SHA-256 machine mining bitcoin, which matters because Bitdeer sells scrypt hardware on the same page. The variant here is the A2 Pro Air: 260 TH/s, 3,874 W, 14.9 J/T, air-cooled, listed at $3,380 or $13.00 per terahash before tax and shipping, with a coupon price of $3,067. Bitdeer publishes a hashrate tolerance of plus or minus 10 per cent, which matters below. Its siblings differ — the plain A2 is 226 T at 16.5 J/T.

The first problem is that Bitdeer has stopped selling it: all four A2 variants read "Sold Out" today. A UK buyer is shopping the secondary market for a machine the maker has moved on from, which is a warranty problem before a price one.

The arithmetic

Difficulty today is 140,577,680,051,920, implying 1,006.29 EH/s across the network. The average reward over the last 144 blocks, fees included, was 3.14057428 BTC, fees being 0.496 per cent of it — a thin fee market offering no rescue. With bitcoin at £61,567 the hashprice is 2.7392p per terahash per day after a 1 per cent pool fee.

At 260 TH/s it earns £7.12 a day, or 0.00011568 BTC, and at 3,874 W it eats 92.98 kWh. Divide one by the other and break-even is 7.660p per kWh. Per megawatt of load it returns £1,838 a day, the figure to put against a hosting quote.

Against the Ofgem cap in force today — 26.32p for the quarter to 31 December, GB average on direct debit — it burns £24.47 of electricity to earn £7.12. That is £17.35 a day, £6,332 a year, before capex.

Agile does not save it. All 48 half-hourly prices for Eastern England were out by the time of writing: cheapest 28.69p at 01:00 UTC, median 34.41p, peak 58.29p at 16:30. Running only in the cheapest half-hour still loses £19.55 a day at that rate. Note that Octopus's inclusive and exclusive VAT figures are identical today: Ofgem confirms there is no VAT on electricity between 1 October 2026 and 31 March 2027, so the usual 1.05 multiplier does not apply this winter.

Whether it fits in a house

At 3,874 W the draw is 16.84 A on a 230 V supply. A standard UK socket is rated 13 A, about 2,990 W, so this cannot go on a plug. It needs a dedicated 32 A radial fitted by a qualified electrician and notified under Part P. The input range is 220–277 V, which at least rules out the 380–415 V three-phase supply that makes machines like the T21 impossible in a home. Bitdeer does not print the phase, so single-phase is inference.

Heat output is 3.874 kW, 13,219 BTU an hour, continuously. Resellers quote 75 dB; Bitdeer gives only a relative claim of 3 to 4 dB below the industry, so treat the absolute figure as unverified and assume a garage. Warranty is 365 days from shipment. The after-sales policy does not name the country of its service centres, makes the customer pay outbound shipping and customs, and says nothing about whether cover transfers to a second owner — for a sold-out machine, the question that matters. At $3,380 plus 20 per cent import VAT the landed cost is about £3,043, or £11.70 per terahash, not the £9.75 the pre-tax figure suggests.

Bear and bull

The bear case is the 7.66p. Nothing a British household can buy is within a factor of three of it, the maker has moved on, and the warranty route for a reseller purchase is undefined. The hashrate tolerance does not rescue it: at the bottom of the range break-even is still about 6.9p.

The bull case is narrow but real. At 14.9 J/T it beats the T21 and S21+ we have reviewed before, and at $13 per terahash it is cheap air-cooled hashrate for anyone with industrial power or a heat-reuse setup where 13,219 BTU an hour displaces a bill already paid. It still loses to the S21 XP's 13.5 J/T, still sold new.

Specifications, pricing and stock from bitdeer.com/shop/sealminer and the A2 Pro Air product page; difficulty and the 144-block reward from mempool.space, network hashrate derived from difficulty rather than mempool's three-day average of 1,032 EH/s; bitcoin price from CoinGecko; GBP/USD 1.3331 from the ECB via frankfurter.dev; half-hourly rates from the Octopus Agile API; cap rate and VAT from ofgem.gov.uk. All retrieved 19 October 2026, 18:51–18:53 UTC. Contested: reseller tables give 255 TH/s and 3,790 W at the wall against the maker's 260 and 3,874; every figure above uses Bitdeer's own bin, the one the $3,380 price refers to. Unverified: Bitdeer publishes no absolute noise or airflow figure and does not state the supply phase or where its service centres are. Agile is regional and quoted here for Eastern England on one day; times are UTC, and Britain is on summer time until 25 October. Mining receipts and disposals are taxable in the UK. Not a recommendation to buy, sell or hold anything.