Million Miner Logo
$/kWh
Out of Stock

MicroBT

MicroBT Whatsminer M21

Model: Whatsminer M21

New
31 TH/s 1860W SHA-256 60 J/TH

Temporarily Unavailable

This product is temporarily unavailable.

Notify Me

Be the first to know when this miner becomes available.

Get a Quote

Interested in this miner? Contact us for availability and pricing.

Get a Quote

Genuine

Tested hardware

Worldwide

Global shipping

Support

Mining experts

Hashrate

31 TH/s

Power

1860 W

Efficiency

60.00 J/TH

Noise

75 dB

Estimated Mining Returns

Based on current BTC price & network difficulty. Indicative only.

Period Daily Weekly Monthly
Income
$1.20 $8.40 $36.00
Electricity
-$2.23 -$15.61 -$66.90
Profit
$-1.03 $-7.21 $-30.90

Using 0.050 $/kWh · Network difficulty as of today. Estimates only.

Adjust rate in the bar above

Updated daily. Last refresh: May 15, 2026. Estimates at $0.08/kWh.

Full Specifications

Hashrate 31 TH/s
Power Consumption 1860 W
Efficiency 60.00 J/TH
Algorithm SHA-256
Model Whatsminer M21
Release Year Aug 2019
Noise Level 75 dB
Dimensions 200 x 300 x 440mm
Weight 7.15 kg
Voltage 100-240V
Interfaces Ethernet
Operating Temp 5 - 35 °C
Humidity 5 - 90 %
Cooling Type Air

What's in the Box

Whatsminer M21
Power supply unit (PSU)
Power cables
Quick start guide

Contents may vary by batch. Exact items listed in order confirmation.

Quick Setup

1

Connect PSU to miner and plug into the outlet

2

Connect ethernet cable to your router or switch

3

Find miner IP via router admin or IP scanner tool

4

Open web interface, enter pool URL and wallet — start mining

Request a Bitcoin Miner Hosting Quote

Free quote, reply in 24h. No sales call.

4.7
star star star star star

4.7 / 5 on Trustpilot

Verified customer reviews

30,000+ miners delivered

Shipped worldwide since 2020

1,200+ customers globally

Trusted in 50+ countries

iso made-in-germany trustpilot
google-review

Get a Quote for the MicroBT Whatsminer M21

Pricing, lead time, and hosting options. Personal advice from our sales team.

Reply within 24h via email, WhatsApp, or call.

Product Details

MicroBT Whatsminer M21 31TH Low Power Universal SHA-256 Bitcoin Miner at 1,860W

MicroBT M21 at 31 TH/s on universal AC. One of the lowest output Whatsminer models on AC power. 1,860W at 75 dB. At roughly 60.0 J/TH, deeply inefficient. The AC input without PSU is the only deployment simplicity advantage. 31 TH/s produces negligible pool revenue at current difficulty.

200 x 300 x 440mm at 7.2 kg. 100-240V input. Ethernet. 5 - 35 °C. MicroBT firmware. Daily electricity $3.12. Monthly: $93.

the Bitcoin network adjusts difficulty each fortnight based on total hashrate. hardware evolution means the Whatsminer M21 loses ground at 20 to 40 percent per generation against newer releases. the Whatsminer M21 fleet economics work when hardware is cheap and power is cheaper. Standard rates erode margins that discount pricing creates. run a mining calculator with the Whatsminer M21 specifications at current Bitcoin conditions before buying.

Total cost of ownership: acquisition plus electricity ($3.12 daily) times deployment days. Compare against alternatives at similar Bitcoin output. compare total Bitcoin production per dollar invested across every available option at your electricity price. consider ongoing upkeep, the likelihood of reselling the Whatsminer M21 later, and how long you plan to mine.

200 x 300 x 440mm at 7.2 kg. 100-240V input. Ethernet connectivity. 5 - 35 °C operating range. MicroBT firmware for pool configuration. SHA 256 Stratum over Ethernet to Foundry, F2Pool, AntPool, or any Bitcoin pool of your choice. Daily electricity $3.12 at $0.07 per kWh. Monthly: $93.

the Bitcoin network adjusts difficulty each fortnight based on total hashrate. hardware evolution means the Whatsminer M21 loses ground at 20 to 40 percent per generation against newer releases. the Whatsminer M21 fleet economics work when hardware is cheap and power is cheaper. Standard rates erode margins that discount pricing creates. run a mining calculator with the Whatsminer M21 specifications at current Bitcoin conditions before buying.

Whatsminer M21 31TH Low Power Universal Voltage Bitcoin Miner

MicroBT M21 at 31 TH/s and 1,860W on universal 100 to 240V. M20 generation. Very low hashrate by current standards. Universal voltage among very old MicroBT models. 75 dB. Deep discount fleet filler.

Air cooled at 75 dB. Bitcoin, Bitcoin Cash. MicroBT firmware. 200 x 300 x 440mm at 7.15 kg. Ethernet. 5 - 35 °C.

75 dB standard industrial. Dedicated mining space required.

MicroBT firmware for pool management. Compare pricing vs competitors. Total hashrate determines production. Model conservatively. Factor acquisition and electricity for TCO.

Compare across manufacturers at this tier. Supply diversity reduces vendor dependence. Legacy hardware carries additional risk of limited support and firmware updates.

Legacy hardware requires careful evaluation. Factor remaining operational life, availability of replacement parts, firmware support status, and seller reliability into your purchase decision. Newer hardware is dramatically more efficient but costs more per unit.

Need Help Choosing?

Our mining specialists can help you find the perfect miner for your setup and budget.

All Products Contact Sales

Whatsminer M21 31TH Low Power BTC

Industrial SHA-256 from MicroBT. 31 TH/s at 1860W and 75 dB. 100-240V. 7.15 kg. Bitcoin, Bitcoin Cash. Ethernet. MicroBT. Compare pricing. TCO at your rate. Factor acquisition and deployment. SHA-256 ASIC. MicroBT firmware. Supply chain options. Legacy hardware discount. Model profitability at your electricity rate. Legacy hardware at deep discount. Factor acquisition and remaining operational life.

Related Products

Antminer S21 XP (270Th)

Bitmain

Antminer S21 XP (270Th)

$4,051.00
Bitmain Antminer S21 (200Th) Antminer S21 200T

Bitmain

Bitmain Antminer S21 (200Th) Antminer S21 200T

$1,402.23
Bitmain Antminer S21 PRO (234Th)

Bitmain

Bitmain Antminer S21 PRO (234Th)

$3,083.00
Bitmain Antminer S21+ Hyd (319TH)

Bitmain

Bitmain Antminer S21+ Hyd (319TH)

$3,750.00
FAQ

Frequently Asked Questions

31 TH/s SHA-256 at 1860.00W. Bitcoin miner from MicroBT.

All SHA-256 cryptocurrencies: Bitcoin (BTC), Bitcoin Cash (BCH), BSV, eCash (XEC).

Yes. Free worldwide DDP shipping to 50+ countries. Genuine hardware with warranty.

Yes. Professional Bitcoin miner hosting from $0.055/kWh with 99.9% uptime and 24/7 monitoring.

Get a Quote