For years the efficiency race was a two-horse contest between Bitmain and MicroBT. In 2026 there's a serious third name: Bitdeer, whose in-house SEALMINER chips now power the most efficient Bitcoin miner on the market. When Bitdeer launched the SEALMINER A4 series in April 2026 at a record 9.45 J/TH, it didn't just match the leaders — it edged ahead of them. Here's the full range and whether it deserves a place in your fleet.
Why Bitdeer SEALMINER matters
Most miner brands buy or commission their chips. Bitdeer designs its own SEAL silicon end to end, which lets it push efficiency aggressively — the A4 generation is about 24% more efficient than the previous A3 (which itself ran ~12.5 J/TH). In a post-halving market where margins are thin, that efficiency edge is exactly what keeps a machine profitable when the Bitcoin price dips.
SEALMINER A4 series: specs
| Model | Hashrate | Power | Efficiency | Cooling | Price |
|---|---|---|---|---|---|
| A4 Ultra Hydro | 886 TH/s | 8,372 W | 9.45 J/TH | Hydro | $9,944 |
| A4 Pro Hydro | 680 TH/s | ~7,400 W | 10.9 J/TH | Hydro | $8,655 |
| A4 Pro Air | 336 TH/s | ~3,660 W | 10.9 J/TH | Air | $2,885 |
The A4 Ultra Hydro is the headline act: 886 TH/s from a single unit at 9.45 J/TH, putting it ahead of Bitmain's S23 Hydro (~9.5 J/TH) on the efficiency leaderboard. The A4 Pro Air is the one to note for smaller setups — at 336 TH/s and 10.9 J/TH it's a genuinely efficient air-cooled machine you can run without a water loop.
SEALMINER DL1: Litecoin & Dogecoin
Bitdeer also makes a Scrypt miner. The SEALMINER DL1 Air (25 Gh/s) mines Litecoin and Dogecoin together — a strong alternative to Bitmain's L-series for anyone building a merge-mining fleet.
Profitability: efficiency in the real world
At mid-2026 Bitcoin hashprice (~$0.033/TH/day), the A4 Ultra Hydro's 886 TH/s grosses about $29/day. Its real advantage shows up in the power column: at 9.45 J/TH it burns roughly 201 kWh/day, so at hosted power (~$0.02/kWh) electricity is ~$4/day, leaving ~$25/day net. A machine running 16–17 J/TH would spend nearly double on power for the same hashrate — which is why, when the price falls, the SEALMINER keeps mining while older rigs switch off. (Estimates; BTC and hashprice move daily.)
SEALMINER vs Antminer vs WhatsMiner
At the top end, the three are now neck and neck: SEALMINER A4 Ultra (9.45 J/TH), Bitmain S23 Hydro (~9.5 J/TH) and MicroBT's best hydro units all cluster around the sub-10 J/TH frontier. Bitdeer's pitch is owning the chip design and pricing aggressively to win share. If you want the single most efficient number on the spec sheet in 2026, the A4 Ultra has it — see how the field compares in our 2026 mining hardware market report and against WhatsMiner.
Who should buy a SEALMINER?
- Farms / hosting: A4 Ultra Hydro — the lowest J/TH available, best long-term margin at scale.
- Mid-size hydro: A4 Pro Hydro (680 TH/s).
- Air-cooled / smaller setups: A4 Pro Air — efficient without a water loop.
- Litecoin + Dogecoin: SEALMINER DL1.
Run a sub-10 J/TH machine where power is cheapest
Hydro units like the A4 Ultra are built for facilities. Host yours with us from $0.018/kWh — we handle the cooling loop and uptime while you bank the efficiency gains.
Compare the SEALMINER range and live prices on the miners page.