Bitdeer SealMiner A3 Pro Air (290TH)

290 TH/s SHA-256 at 3,625W and 12.5 J/TH on Bitdeer's proprietary SEAL02 chip. ±3 percent hashrate and ±5 percent power tolerance. Four cooling fans at 75 dB. This is the highest hashrate and best efficiency in Bitdeer's A3 air cooled lineup (the standard A3 Air produces 260 TH/s). The SEAL02 chip is the same silicon used across the entire A3 series at different power and hashrate bins.

A3 Pro Air at 290 TH/s, 3,625W, 12.5 J/TH, $4,490. S21 XP at 270 TH/s, 3,645W, 13.5 J/TH, $4,051. The A3 Pro Air delivers 7.4 percent more hashrate at 7.4 percent better efficiency at essentially identical power draw. The S21 XP costs $439 less. Over one year at $0.08 per kWh, the A3 Pro Air produces approximately 7.4 percent more Bitcoin at the same electricity cost, generating approximately $1,391 more annual profit (at current conditions). The extra $439 acquisition cost pays for itself in approximately 42 days through the higher daily profit. For operators optimizing on efficiency and daily return, the A3 Pro Air wins. For operators minimizing upfront CapEx, the S21 XP wins.

A16XP at 300 TH/s, 3,850W, 12.8 J/TH. A3 Pro Air at 290 TH/s, 3,625W, 12.5 J/TH. The A16XP produces 10 TH/s more hashrate at 225W more power and 2.3 percent worse efficiency. For operators maximizing absolute hashrate per rack slot, the A16XP wins. For operators maximizing hashrate per watt, the A3 Pro Air wins. Both are excellent current generation hardware. Pricing and availability at purchase time determines value.

Most air cooled Bitcoin miners specify 0 to 5 degrees Celsius as their minimum operating temperature. The A3 Pro Air operates down to -20 degrees Celsius. For container deployments, outdoor installations, or unheated warehouses in cold climate regions (Canada, Nordic countries, Russia, Mongolia, northern US), this eliminates the need for intake air heating systems. Heating infrastructure for mining containers costs $1,000 to $3,500 in CapEx plus ongoing electricity for the heaters. The A3 Pro Air deploys through sub zero winters without any of that infrastructure.

220 to 277V single phase AC. No 110V support. At 3,625W on 220V draws approximately 16.5 amps. Fits standard 20 amp commercial circuits. North American residential typically provides 240V on dedicated dryer or range circuits. The built in PSU operates at 97 percent efficiency, meaning only 3 percent of wall power is lost as PSU heat versus typical 90 to 93 percent on external PSUs.

Yes, strongly. MillionMiner calculator at $0.08 per kWh: +$3.81 daily profit ($10.77 revenue minus $6.96 electricity). At $4,490 acquisition, payback approximately 39 days. At $0.07 per kWh: +$4.68 daily, payback approximately 32 days. At $0.05 per kWh: +$6.42 daily, payback approximately 23 days. Profitable at any electricity rate below approximately $0.12 per kWh at April 2026 BTC price and difficulty. This is among the fastest ROI timelines for any currently available Bitcoin miner.

Bitdeer Technologies Group (NASDAQ: BTDR). Singapore headquartered, NASDAQ listed. Founded by Jihan Wu (Bitmain co-founder). Bitdeer designs proprietary ASIC chips (SEAL program) and operates large scale mining infrastructure globally. One of very few companies that both designs the silicon and runs the mining operations. The hardware reflects real operational experience from Bitdeer's own production mining farms. 12 month manufacturer warranty.

A4 Pro Air at 336 TH/s, 10.9 J/TH on SEAL04 chip. A3 Pro Air at 290 TH/s, 12.5 J/TH on SEAL02 chip. The A4 Pro Air is the next generation: 15.9 percent more hashrate at 12.8 percent better efficiency. The A4 series represents a generational silicon upgrade. For buyers who can acquire the A4 Pro Air, it is the superior product. The A3 Pro Air is available in stock now at $4,490 while A4 availability may be limited. Production availability often determines the practical choice.

75 dB from four cooling fans. Standard industrial ASIC noise, comparable to the S21 XP and S23. Requires dedicated mining space: warehouse, outbuilding, garage with sound isolation, container, or basement with ventilation. Not suitable for shared residential rooms or offices. This is the standard noise profile for any 3,000W+ air cooled Bitcoin miner regardless of manufacturer.

365 x 292 x 197 mm at 15.5 kg. MM's spec sheet lists "15 g" which is a data entry error. Standard industrial ASIC form factor. Rack mountable. The same chassis dimensions as the standard A3 Air (260 TH/s), meaning the Pro Air delivers 11.5 percent more hashrate from identical physical footprint.

SEAL02 is Bitdeer's second generation proprietary SHA-256 mining chip, following the SEAL01 (A2 series). Bitdeer designs chips in house through their SEAL program rather than using third party silicon. The SEAL02 powers the entire A3 product family: A3 Air (260 TH/s), A3 Pro Air (290 TH/s, this product), A3 Hydro (500 TH/s), A3 Pro Hydro (660 TH/s). The SEAL04 chip (A4 series) is the third generation delivering sub-11 J/TH efficiency.

All SHA-256 proof of work cryptocurrencies. Bitcoin (BTC) primary. Bitcoin Cash (BCH), Bitcoin SV (BSV), eCash (XEC), and other SHA-256 chains. AuxPoW merged mining through supporting pools allows additional revenue from NMC, VIA, and other merge minable coins.

Yes. Built in 97 percent efficiency PSU. No external power supply to source. Connect directly to 220 to 277V outlet. The 97 percent PSU efficiency is better than typical external PSUs (90 to 93 percent), meaning less wasted electricity as PSU heat, contributing to the A3 Pro Air's overall system efficiency advantage.

Standard industrial ASIC setup. Connect power cable to 220 to 277V outlet (verify circuit amperage: 20A recommended at 220V). Connect Ethernet cable to router or switch. Find miner IP through Bitdeer IP scanner, router DHCP, or network scanning. Open web interface, configure SHA-256 pool URL and BTC wallet address. Verify hashrate stabilizes at approximately 290 TH/s within 10 to 15 minutes.

Every major SHA-256 pool: Foundry USA, AntPool, F2Pool, ViaBTC, Braiins Pool, Luxor, OCEAN, and all SHA-256 compatible pools. Standard Stratum protocol. No hardware compatibility restrictions. Pool selection is pool preference.

Bitdeer's SealMiner firmware is proprietary. BraiinsOS+ does not currently support SealMiner hardware. Operators run stock Bitdeer firmware. For operators requiring BraiinsOS+ autotuning or other third party firmware features, Bitmain Antminer alternatives offer broader firmware ecosystem support.

Yes. MillionMiner hosting facilities accept SHA-256 hardware including the A3 Pro Air. At hosted industrial rates ($0.07 per kWh), daily electricity drops to $6.09, profit rises to +$4.68 daily. The -20 degree cold tolerance makes the A3 Pro Air particularly well suited for container hosted deployment in colder US facility locations.

Standard air cooled ASIC maintenance. Quarterly dust cleaning of four fan intake and exhaust. Annual fan bearing inspection. Monitor hashrate through Bitdeer web interface. Released October 2025, units have approximately 6 months of field data. Bitdeer provides 12 month manufacturer warranty.

The A3 Pro Air is one of the strongest value propositions in the current Bitcoin mining market. At 12.5 J/TH it is the most efficient air cooled A3 generation miner. At $4,490 with +$3.81 daily profit and approximately 39 day payback at $0.08 per kWh, the ROI timeline is aggressive. Buy if: you want the most efficient air cooled Bitcoin miner available at its generation, you deploy in cold climates where the -20 degree floor saves heating infrastructure, you value Bitdeer's vertical integration and operational DNA, or you want a profitable miner with fast payback. Consider the Bitmain S21 XP if you need lower upfront cost ($4,051 versus $4,490). Consider the Bitdeer A4 Pro Air (336 TH/s, 10.9 J/TH) if you want next generation efficiency and can secure availability.

Within Bitdeer A3 air lineup: SealMiner A3 Air (260 TH/s, lower cost entry). Within Bitdeer hydro: A3 Hydro (500 TH/s), A3 Pro Hydro (660 TH/s) for liquid cooled deployment. Within Bitdeer A4 next gen: A4 Pro Air (336 TH/s, 10.9 J/TH), A4 Pro Hydro (680 TH/s), A4 Ultra Hydro (886 TH/s, 9.45 J/TH). Competing air cooled: Bitmain S21 XP (270 TH/s, $4,051), Bitmain S23 (318 TH/s, $8,103), Canaan A16XP (300 TH/s). For fleet diversification beyond Bitcoin: Bitmain KS7 (45 TH/s Kaspa, $2,123), Bitmain L9 (17 GH/s Scrypt, $3,990).