Bitdeer Launches SEALMINER A4 Bitcoin Miners With Industry-Leading 9.45 J/TH Efficiency

Bitdeer Rolls Out SEALMINER A4 Lineup

Bitdeer has officially launched sales of its SEALMINER A4 series of Bitcoin ASIC miners. The flagship model, A4 Ultra Hydro, delivers an energy efficiency rating of 9.45 J/TH — placing it among the most power-efficient mining rigs currently available.

«The @SealMiner A4 Series has officially launched. Up to 900 TH/s. As low as 9.45 J/TH.» — Bitdeer (@BitdeerOfficial), original post

Why This Matters

The race for lower joules-per-terahash has become the defining battleground among ASIC manufacturers. As Bitcoin's mining difficulty continues to climb and block rewards shrink post-halving, energy efficiency directly determines profitability. Bitdeer's entry at 9.45 J/TH puts it in direct competition with the most efficient devices on the market, potentially reshaping miner purchasing decisions and the competitive dynamics among hardware vendors.

Three Models for Different Deployments

The A4 Ultra Hydro sits at the top of the lineup. Designed for standard server rack installations, it produces a hashrate of 886 TH/s. The unit relies on hydro-cooling and, according to Bitdeer, maintains stable operation across extreme temperatures ranging from -20°C to 55°C.

The mid-range SEALMINER A4 Pro Hydro shares the same rack-mountable form factor and also uses hydro-cooling. It delivers 680 TH/s with an energy efficiency of 10.9 J/TH, operating within the same temperature range as the Ultra Hydro model.

Bitdeer notes that with hydro-cooling, core components remain in an "optimal comfort zone" regardless of ambient conditions, ensuring peak performance.

The third option, the A4 Pro Air, targets facilities using air cooling. Equipped with four fans, the unit reportedly operates at low noise levels. It achieves a hashrate of 336 TH/s at 10.9 J/TH, with guaranteed performance between -20°C and 50°C.

Competitive Landscape in ASIC Mining

Prior to the SEALMINER A4 launch, the only commercially available miners matching the ~9.5 J/TH efficiency threshold were the flagship Antminer S23 models from Bitmine, released in May 2025. According to Antpool data, those units currently top the profitability rankings for Bitcoin mining. The most powerful model from Bitdeer's previous SEALMINER A3 series has been their closest competitor.

U.S.-based manufacturer Auradine announced its third-generation Teraflux mining rigs in November 2025, claiming up to 9.8 J/TH efficiency for liquid and immersion-cooled variants. Sales were expected to begin in Q2 2026, but at the time of the SEALMINER A4 launch, no press release was available on Auradine's website. The Teraflux models currently available for purchase offer efficiency ratings of 17.5–19 J/TH.

Bitdeer's Growing Hardware Portfolio

The SEALMINER A4 launch follows Bitdeer's March release of the SEALMINER DL1 Air, a mining rig built for Scrypt-algorithm cryptocurrencies including Litecoin and Dogecoin. With the A4 series, Bitdeer solidifies its position as a vertically integrated mining company capable of competing head-to-head with established ASIC manufacturers on the metric that matters most — energy efficiency per terahash.