Pencil drawing of the GekkoScience Mein Coffee (1 TH version)

Home miner Lottery miner Desktop In production

GekkoScience Mein Coffee (1 TH version)

A fanless miner built into a walnut base with an aluminium hotplate, so the waste heat keeps a mug of coffee warm. It mines up to 1 TH/s on 27 W over USB-C and has an OLED screen and Wi-Fi web setup. It is silent, made in America, and more a desk toy than a heater.

Best price $249

$249.00 per TH · New · In stock at Altair Technology · excl. tax

Reviews from Nostr ↓

Hashrate1 TH/s worst 250 GH/sbest 1.16 PH/s 189th best of 197 (the bar uses a log scale)
Power (stock)27 W lowest 11 Whighest 22 kW 189th highest of 199 (the bar uses a log scale)
Efficiency27 J/TH worst 100 J/THbest 8.9 J/TH 161st best of 195
Earns per kWh$0.056 worst $0.010best $0.171 161st best of 195
Heat output92 BTU/h worst 38 BTU/hbest 75,067 BTU/h 189th best of 199 (the bar uses a log scale)
Noise—
Price per TH$249.00 worst $539.96best $1.82 152nd best of 156 (the bar uses a log scale)

Where to buy

Store Trustpilot Condition Availability Listed price In your currency Per TH Checked Link
Altair Technology Ships from United States TrustScore 4.7 out of 5, 623 reviews New In stock $249 excl. tax $249 $249.00 12 Nov 2026 Visit
GekkoScience Ships from United States · Maker's own shop 3 in stock (can be backordered) TrustScore 3.3 out of 5, 3 reviews New In stock $270 $270 $270.00 4 Nov 2026 Visit
The Solo Mining Co Ships from United Kingdom · 650 GH/s unit Store notes listed as up to about 650 GH/s on about 23 W with Bitmain BM1362 chips (the maker now sells a 1 TH / 27 W version); enamel mug included TrustScore 4.9 out of 5, 205 reviews New In stock £300 $399 $614.14 7 Nov 2026 Visit
Bitcoin Merch Ships from United States TrustScore 4.4 out of 5, 1,082 reviews New In stock $500 $500 $499.99 4 Nov 2026 Visit

Prices as listed on each store's page on the date shown, without shipping. Prices marked excl. tax leave out VAT or sales tax, and others may too. Per TH uses the hashrate of the unit each store sells. Converted at ECB rates of 11 Nov 2026. Trustpilot scores are for the store, not the device. Each store's name opens its page, with everything it sells and its reviews.

Heat, running cost and sats

Heat per day
—
Electricity per day
—
Mining earns per day*
—
Net cost per day
—
Net cost per kWh of heat
—
Solo: chance of a block per year
—
Earns per kWh, on 3-month averages
—
Payback
—

*What a pool would pay on average at today's difficulty, block reward and bitcoin price, before pool fees. Solo miners usually earn nothing, and very rarely a whole block. A plain electric heater turns the same electricity into the same heat, so the mining income is what makes the difference.

Payback is how long the bitcoin a device earns takes to add up to its price. It leaves out electricity, which buys the heat: compare earnings per kWh with your electricity price to see whether mining alone covers it. It uses the average of the last 3 months, to 12 Nov 2026: bitcoin at $79,558, 969 EH/s on the network and 3.15 BTC a block, less a 2% pool fee, for the hours you set. It cuts the block subsidy in half at each halving, the next around Apr 2028, and otherwise assumes those carry on unchanged, which they won't. Income at today's difficulty and price is about 17% below that average. Hashrate usually rises, though miners that stop paying after a halving may switch off, which leaves more for the rest. How we work it out.

Specifications

BrandGekkoScience
ModelMein Coffee (1 TH version)
SKU—
TypeLottery miner · Home
Form factorDesktop
CoolingAir
Production statusIn production
Launch date—
Hashrate1 TH/s
Power consumption (stock)27 W
Mining efficiency27 J/TH *
ASIC chipNot known yet
Heat output92 BTU/h
Input voltageUSB-C (adapter included)
Frequency—
Net dimensions (W × D × H)—
Net weight—
Noise—
Operating temperature—
Area heatedLess than 1 m² (our estimate)
Colours—
Company based inUnited States
Made inUnited States

* Not confirmed by the maker's own documents yet.

Features

  • Fanless, silent operation
  • Aluminium hotplate keeps a mug warm (up to 55 °C, adjustable)
  • Walnut base
  • USB-C power, adapter included
  • OLED screen with temperature, miner, network and price stats
  • Linux controller with Wi-Fi web interface (by The Solo Mining Co)

Reviews

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Similar home miners

Sources and data notes

Chip by version: Original 650–700 GH/s, 23 W version: BM1362 (reported). See the chips page.

Not yet confirmed from the maker's own documents: launch date; efficiency; dimensions; weight; noise; operating temperature.

Spotted a mistake? Let us know.