Antminer, Whatsminer and SEALMINER: how the three brands compare

Almost every serious Bitcoin mining site runs machines from one of three makers: Bitmain, whose machines are branded Antminer, MicroBT, whose machines are branded Whatsminer, and Bitdeer, whose SEALMINER line is the newest of the three. Comparing them on hashrate alone is close to useless, because within a generation they land in the same band. The differences are in efficiency at a given price, in how the machines behave on a real site, and in what happens when something breaks.

Bitmain and the Antminer line

Bitmain has the deepest catalogue and the widest coverage: air, hydro and immersion variants of most models, plus machines for algorithms other than SHA-256. That breadth is the practical argument for the brand. If a site needs one hydro model, one air model and a Scrypt machine, one supplier relationship covers all three.

The ecosystem is the second argument. Antminers are the most widely deployed machines in the world, which means the largest pool of technicians who know them, the widest availability of spare hashboards and power supplies, and the deepest third party firmware support. When you are sourcing a control board at short notice, market share is a feature.

MicroBT and the Whatsminer line

MicroBT has built a reputation among operators for build quality and for machines that tolerate difficult conditions. The line is narrower than Bitmain's and the company moves less noisily, but Whatsminers have a longstanding following among operators who run large air cooled sites in hot climates, where derating behaviour and PSU robustness show up in the monthly numbers.

Resale is generally strong. On the used market a Whatsminer of a given generation tends to hold value well, which matters more than people expect if your plan involves rotating the fleet rather than running it to failure.

Bitdeer and the SEALMINER line

Bitdeer is a mining company that started making its own chips, which gives the SEALMINER line a different origin story from the other two. The machines are designed by an operator for operators, and the line has pushed hard at the efficiency frontier, with hydro models built for rack density rather than adapted from air cooled designs.

The line is younger, which cuts both ways. The efficiency numbers at the top of the range are genuinely competitive. The installed base and the spares network are smaller than Bitmain's, so plan spares with the supplier at the point of order rather than assuming a market exists for them.

The differences that actually decide it

• Efficiency at your price point. Not the headline model, the one you can actually buy in quantity. Divide joules per terahash into your power price and compare the machines you were quoted, as in efficiency over hashrate. The rest of the fields worth reading are in the spec sheet fields that decide fit.
• Cooling variant availability. If your site is hydro, the question is which brand has a hydro model at your efficiency target with a real delivery date, not which brand is better in the abstract.
• Power supply and voltage. Input voltage ranges differ between brands and between variants. A machine that wants 380 to 415 V three phase does not belong on a 208 V site. Check it against your electrical layout before ordering.
• Firmware policy. Third party firmware support is uneven across brands, and running it has warranty consequences. See tuning a fleet.
• Service reality. Where do boards go for repair, who pays the freight, and how long is the turnaround in your region? Ask before you sign, not after.

Mixing brands on one site

It is common and usually fine, with two caveats. Your monitoring has to handle both, because the APIs and the firmware conventions differ, and your spares inventory doubles. On a site above a few megawatts the diversification is worth it: a firmware bug or a supply problem at one manufacturer does not take out the whole fleet. Below that scale, one brand keeps the operation simpler.

How to actually choose

Set your power price, your cooling route and your budget first. Those three constraints usually cut the candidate list to two or three specific models across all brands, and at that point the choice is between machines rather than between logos. If two models come out close, take the one with the better spares position in your region. That is the difference you will feel in year two.