Bitdeer has begun selling its SEALMINER A4 series of Bitcoin mining rigs, boasting an energy efficiency of 9.45 J/TH.
The @SealMiner A4 Series has officially launched.
— Bitdeer (@BitdeerOfficial) April 7, 2026
Up to 900 TH/s. As low as 9.45 J/TH.
Explore the full lineup 🛠️ https://t.co/F4mQD3g8vj#Bitcoin #BitcoinMining #BTC #Hashrate #MiningRig pic.twitter.com/egF0PtuzNK
The A4 Ultra Hydro is an ASIC miner designed for standard server racks, delivering a hashrate of 886 TH/s.
The lower-tier SEALMINER A4 Pro Hydro features a similar form factor, achieving 680 TH/s with an energy consumption of 10.9 J/TH. Both models are intended for use in hydro-cooled systems and are said to maintain stable operation in extreme temperature ranges from -20°C to 55°C.
“Regardless of the environment, the main components remain in the 'optimal comfort zone' to achieve maximum efficiency,” the description states.
The A4 Pro Air miner, which uses air cooling and is equipped with four fans, operates at a “low noise level,” according to Bitdeer. It provides a hashrate of 336 TH/s with an energy consumption of 10.9 J/TH, with specifications guaranteed for temperatures ranging from -20°C to 50°C.
The Race for Efficiency
In November 2025, American manufacturer Auradine announced its third-generation Teraflux mining rigs for Bitcoin, achieving efficiencies of up to 9.8 J/TH for liquid and immersion cooling options. Sales were expected to start in the second quarter of 2026. As of this writing, the press release is not available on the company's website. Customers can access models with efficiencies ranging from 17.5 to 19 J/TH here.
Currently, only the flagship Antminer S23 series from Bitmine, launched in May 2025, has achieved energy consumption levels of 9.5 J/TH.
According to Antpool, these rigs lead the profitability rankings for Bitcoin mining, with competition coming from the most powerful model of the previous SEALMINER A3 series.
As a reminder, in March, Bitdeer released the SEALMINER DL1 Air, designed for mining cryptocurrencies that use the Scrypt hashing algorithm, including Litecoin and Dogecoin.