Antminer S21 Hydro vs MicroBT WhatsMiner M78S
Side-by-side specs, profitability, and home mining comparison.
Specifications Comparison
| Antminer S21 Hydro | Specification | MicroBT WhatsMiner M78S |
|---|---|---|
| 335.0 TH/s | Hashrate | 498.0 TH/s |
| 5,360 W | Power Consumption | 6,723 W |
| 16.0 J/TH | Efficiency | 13.5 J/TH |
| 50 dB | Noise Level | 75 dB |
| 15.8 kg | Weight | 18.0 kg |
| 18,288 BTU/hr | BTU Output | 22,939 BTU/hr |
| 44/100 | Home Mining Score | 30/100 |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | MicroBT |
Profitability Comparison
Antminer S21 Hydro
MicroBT WhatsMiner M78S
Based on BTC price of $77,461 and current network difficulty as of Apr 25, 2026. Actual results vary.
Verdict
Based on our multi-factor analysis, the MicroBT WhatsMiner M78S wins on 2 of 5 factors (efficiency, hashrate). The Antminer S21 Hydro holds the edge in power consumption and home mining score and noise level. Review the detailed specs and profitability calculations above to determine which miner best fits your specific setup.
Best For...
Best for Profitability
MicroBT WhatsMiner M78S$2.58/day higher profit at current rates.
Best for Home Mining
Antminer S21 HydroScore: 44/100. 50 dB noise level.
Best for Efficiency
MicroBT WhatsMiner M78S13.5 J/TH — lower electricity cost per terahash.
Frequently Asked Questions
Is the Antminer S21 Hydro or MicroBT WhatsMiner M78S more profitable?
At the current BTC price and a $0.10/kWh electricity rate, the MicroBT WhatsMiner M78S is more profitable at $1.75/day compared to $-0.83/day for the Antminer S21 Hydro. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.
Which is quieter, the Antminer S21 Hydro or MicroBT WhatsMiner M78S?
The Antminer S21 Hydro is quieter at 50 dB compared to the MicroBT WhatsMiner M78S at 75 dB. For home mining, lower noise levels make a significant difference in livability.
Which is better for home mining, the Antminer S21 Hydro or MicroBT WhatsMiner M78S?
The Antminer S21 Hydro scores 44/100 on our Home Mining Score (vs 30/100 for the MicroBT WhatsMiner M78S). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.
What is the efficiency difference between Antminer S21 Hydro and MicroBT WhatsMiner M78S?
The Antminer S21 Hydro runs at 16.0 J/TH while the MicroBT WhatsMiner M78S runs at 13.5 J/TH — a difference of 2.5 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs.
Compare Antminer S21 Hydro with...
Compare MicroBT WhatsMiner M78S with...
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