21energy Ofen
- Hashrate
- 10 TH/s
- Power
- 800 W
- Efficiency
- 80 J/TH
- Noise
- 35 dB
Space heater Floor standing In production
A tall 3D-printed chimney that holds one reconditioned Antminer 19-series hashboard and uses rising warm air plus four quiet 120 mm fans. About 21–24 TH/s on roughly 600–650 W from a normal 120 V outlet, at around 40–45 dB.
Best price $379
$18.06 per TH · Refurbished · In stock at D-Central Store notes
BitChimney S19, Gelid fans (S19j Pro versions CAD 705-725)
Note from 4 Nov 2026.
| Store | Trustpilot | Condition | Availability | Listed price | In your currency | Per TH | Checked | Link |
|---|---|---|---|---|---|---|---|---|
| D-Central Ships from Canada Store notes BitChimney S19, Gelid fans (S19j Pro versions CAD 705-725) These notes are from 4 Nov 2026. Price and stock were checked since. | No score | Refurbished | In stock | CA$540 | $379 | $18.06 | 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 | D-Central |
|---|---|
| Model | The BitChimney |
| SKU | DC-SH-BITCHIMNEY |
| Type | Space heater · Home |
| Form factor | Floor standing |
| Cooling | Air |
| Production status | In production |
| Launch date | — |
| Hashrate | 21 TH/s |
| Power consumption (stock) | 600 W |
| Mining efficiency | 29 J/TH |
| ASIC chip | Bitmain BM1398 × 76 (reported by an independent source); BM1362 in some versions |
| Miner inside | 1 x reconditioned Bitmain Antminer S19 or S19j Pro hashboard |
| Heat output | 2,047 BTU/h |
| Input voltage | 120 V (standard household outlet) |
| Frequency | — |
| Net dimensions (W × D × H) | — |
| Net weight | 7 kg (15.4 lb) |
| Noise | 40–45 dB |
| Operating temperature | — |
| Area heated | About 4–12 m² (our estimate) |
| Colours | Orange, Black |
| Company based in | Canada |
| Made in | Canada |
* Not confirmed by the maker's own documents yet.
| Version | Hashrate | Power | Efficiency |
|---|---|---|---|
| BitChimney S19 | 21 TH/s | 600 W | 29 J/TH |
| BitChimney S19j Pro | 24 TH/s | 650 W | 27 J/TH |
OrangeBlack
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Chip by version: BitChimney S19j Pro: BM1362 × 126 (reported). See the chips page.
Not yet confirmed from the maker's own documents: dimensions; operating temperature; launch date.
Spotted a mistake? Let us know.