Bitdeer Launches SEALMINER A4 Bitcoin Miner with 9.45 J/TH Energy Efficiency

Bitdeer launches SEALMINER A4 series with 9.45 J/TH efficiency.

Bitdeer has commenced sales of its SEALMINER A4 series bitcoin mining rigs. The flagship model of the new series boasts an energy efficiency of 9.45 J/TH.

The @SealMiner A4 Series has officially launched.
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

— Bitdeer (@BitdeerOfficial) April 7, 2026

The device in question is the ASIC miner A4 Ultra Hydro. It is designed for installation in standard server racks and provides a hashrate of 886 TH/s.

The lower-end model, SEALMINER A4 Pro Hydro, shares a similar form factor and delivers 680 TH/s with an energy efficiency of 10.9 J/TH. Both units are intended for use in hydro-cooling systems and, according to the manufacturer, maintain operational stability across extreme temperatures ranging 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, featuring air cooling, is equipped with four fans but operates “with low noise,” according to Bitdeer. This unit provides a hashrate of 336 TH/s with an energy efficiency of 10.9 J/TH. The specifications are guaranteed for a temperature range of -20°C to 50°C.

The Race for Efficiency

In November 2025, American manufacturer Auradine announced its third-generation Teraflux bitcoin mining rigs, offering efficiencies of up to 9.8 J/TH for models with liquid and immersion cooling. Sales were planned for the second quarter of 2026. At the time of writing, a press release is absent from the company’s website. Models with efficiencies ranging from 17.5 to 19 J/TH are available to buyers.

Among the devices available on the market, only the flagship Antminer S23 series miners from Bitmine, introduced in May 2025, have achieved energy efficiencies of 9.5 J/TH.

According to Antpool, these units top the profitability rankings for bitcoin mining. They are rivaled by the most powerful model from the previous SEALMINER A3 lineup.

In March, Bitdeer released the SEALMINER DL1 Air unit for mining cryptocurrencies that use the Scrypt hashing algorithm, including Litecoin and Dogecoin.