GekkoScience Mein Coffee

A GekkoScience desk mug warmer that heats its aluminum plate with the waste heat of a built-in Bitcoin miner. It keeps a drink warm, or warms a scented candle, while hashing on a mining pool, and is suited to solo "lottery" mining rather than steady pool income.

The unit works to a target temperature, not a target hashrate: it raises or lowers its hashrate to hold the plate at the set temperature, so the hashrate depends on how much heat the item on the plate absorbs. It has no fans; the metal upper half works as a passive heatsink. A built-in NanoPi computer running Debian Linux handles control, so other services such as a node can be installed on it.

Specifications

• ASICs: 4 x Bitmain BM1362
• Power: 23 W via USB-C (USB Power Delivery)
• Dimensions: 105 x 105 x 42 mm
• Materials: walnut base, aluminum upper half
• Display: 0.91 in OLED
• Controls: two front buttons; controllable LED underglow
• Connectivity: built-in Wi-Fi, web interface, setup hotspot
• Cooling: passive, no fans
• Assembled in the USA

Notes

• Setup: power it from a USB-C PD adapter, wait about a minute for it to boot, join the "Mein Coffee" Wi-Fi network, then open the IP address shown on screen to enter Wi-Fi, pool and worker details.
• Factory reset: hold either front button while connecting power and keep holding for about 60 seconds.