21energy Ofen
- Hashrate
- 10 TH/s
- Power
- 800 W
- Efficiency
- 80 J/TH
- Noise
- 35 dB
Space heater Floor standing In production
A long, low baseboard-style heater with 800 W of mining chips (37.5 TH/s). It has a thermostat-style Heater mode, a full-power Mining mode and a quiet Night mode, plus tip-over cut-off and an aluminium body. Canaan says it can warm a small room in about 10 minutes.
Best price $789
$21.04 per TH · New · In stock at Altair Technology
price includes US tariffs and import duties
Note from 4 Nov 2026.
| Store | Trustpilot | Condition | Availability | Listed price | In your currency | Per TH | Checked | Link |
|---|---|---|---|---|---|---|---|---|
| Altair Technology Ships from United States price includes US tariffs and import duties These notes are from 4 Nov 2026. Price and stock were checked since. | TrustScore 4.7 out of 5, 623 reviews | New | In stock | $789 | $789 | $21.04 | 12 Nov 2026 | Visit |
| Canaan Official Shop Ships from China · Maker's own shop ships from CN or US-TX warehouse | TrustScore 2.7 out of 5, 6 reviews | New | In stock | $999 | $999 | $26.64 | 4 Nov 2026 | Visit |
| D-Central Ships from Canada Store notes | No score | New | In stock | CA$1,750 | $1,229 | $32.78 | 12 Nov 2026 | Visit |
| Mining Wholesale Ships from Netherlands Ships out in 3-7 working days. Price excl. VAT. | TrustScore 4.7 out of 5, 401 reviews | New | In stock | €1,149 excl. tax | $1,278 | $34.09 | 10 Nov 2026 | Visit |
| The Solo Mining Co Ships from United Kingdom Store notes | TrustScore 4.9 out of 5, 205 reviews | New | In stock | £1,000 | $1,331 | $35.48 | 7 Nov 2026 | Visit |
| Solo Satoshi Ships from United States | TrustScore 4.8 out of 5, 206 reviews | New | Out of stock | $750 | $750 | $20.00 | 4 Nov 2026 | Visit |
| MineShop Ships from EU (IE/LV) listed as no longer available; EUR 1,008.44 incl. VAT These notes are from 4 Nov 2026. Price and stock were checked since. | TrustScore 4.7 out of 5, 1,610 reviews | New | Out of stock | €820 excl. tax | $912 | $24.33 | 12 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.
The maker gives no hashrate for this mode, so we can't work out its mining income.
*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.
| Brand | Canaan |
|---|---|
| Model | Avalon Mini 3 |
| SKU | — |
| Type | Space heater · Home |
| Form factor | Floor standing |
| Cooling | Air |
| Production status | In production |
| Launch date | Jan 2025 * |
| Hashrate | 37.5 TH/s |
| Power consumption (stock) | 800 W |
| Mining efficiency | 21 J/TH |
| ASIC chip | Canaan A3197S × 66 (named by the device's maker) |
| Heat output | 2,730 BTU/h |
| Input voltage | 110–240 V AC |
| Frequency | 50/60 Hz |
| Net dimensions (W × D × H) | 760 × 104 × 215 mm (29.9 × 4.1 × 8.4 in) |
| Net weight | 8.35 kg (18.4 lb) |
| Noise | 35–55 dB * |
| Operating temperature | -5–40 °C (23–104 °F) |
| Area heated | About 5.3–16 m² (our estimate) |
| Colours | Black |
| Company based in | Singapore |
| Made in | — |
* Not confirmed by the maker's own documents yet.
| Mode | Hashrate | Power | Heat |
|---|---|---|---|
| Mining mode (full power) | 37.5 TH/s | 800 W | 2,730 BTU/h |
| Heater mode, 500 W level | — | 500 W | 1,706 BTU/h |
| Night mode | — | — | — |
Black
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Not yet confirmed from the maker's own documents: SKU; where it's made; launch date (CES 2025 launch/pre-order month; first shipping not confirmed); area heated (Canaan only cites a 10 cubic metre test room); minimum noise (35 dB on canaan.io vs 33 dB on shop).
Spotted a mistake? Let us know.