21energy Ofen 2
Browse our current-gen miners. Add the ones you want, then sign in any time to save your cart and check out.
21energySHA-256BTC
Ofen 2
40 TH/s1,000 WAir-cooled
Profit / day
-$0.73/day
after power at $0.08/kWh
Efficiency
25.00J/TH
Availability
Not stockedWe don’t carry this model. Ask and we’ll try to source one.—
Profitability · SHA-256 · BTC
Is the Ofen 2 profitable?
Not at $0.08 per kWh. The 21energy Ofen 2 mines Bitcoin on the SHA-256 algorithm at 40 TH/s, drawing 1,000 W (25.0 J/TH). At $0.08 per kWh it earns about $1.19 a day but spends $1.92 on power, so it loses $0.73 a day.
It’s #143 of 269 SHA-256 miners on efficiency. It isn’t in stock with us at the moment. It’s an air-cooled unit, released in April 2026.
- Break-even power price
- $0.050/kWh
- Daily profit rank
- #236of 533
It only makes money below this.
Across every miner we track.
Ofen 2 specifications
Other coins it can mine
Mine instead
BitcoinBTCRanked on
$1.190.0000158 BTC
–
0.0000046%
$31.0B
−2.0%
QuaiQUAI
$1.43197.66 QUAI
+20%
0.05%
$90kLow liquidity
+14.8%
eCashXEC
$1.31232,949 XEC
+11%
0.09%
$2.7M
−6.5%
Bitcoin CashBCH
$1.170.00490 BCH
−2%
0.0012%
$140.1M
−13.9%
DigiByte (SHA-256)DGB
$0.85281.71 DGB
−29%
0.10%
$2.3M
−4.1%
Paid on top
Fractal BitcoinFB
+<$0.010.000202 FB
+<1%
0.0000047%
$2.4M
−19.0%Volatile
NamecoinNMC
+<$0.010.0000172 NMC
+<1%
0.0000047%
$0Illiquid
+0.4%
ElastosELA
+<$0.010.0000172 ELA
+<1%
0.0000047%
$311k
−38.1%Highly volatile
HathorHTR
+<$0.010.00154 HTR
+<1%
0.0000047%
$69kLow liquidity
−17.1%Volatile
Max potential profitUnlikely
-$0.73/day
-$0.73 BTC profit + <$0.01 paid on top
How it compares · SHA-256 miners
| Miner | Rank | Efficiency | Profit / day |
|---|---|---|---|
| Bitmain Antminer S23 Hyd 3U (1.16 PH) | #1 | 9.5 J/TH | $13.31 |
| Bitdeer SealMiner A4 Ultra Hydro | #2 | 9.4 J/TH | $10.26 |
| Bitmain Antminer S23e Hyd U2H (865T) | #3 | 10.0 J/TH | $9.10 |
| Bitmain Antminer S23e Hyd 2U (865Th) | #4 | 10.0 J/TH | $9.10 |
| 21energy Ofen 2 ProNewer model | #93 | 18.3 J/TH | -$0.33 |
| 21energy Ofen 2This miner | #112 | 25.0 J/TH | -$0.73 |
| Heatbit Maxi Pro | #125 | 25.0 J/TH | -$1.10 |
| 21energy Ofen 3 Base XL | #138 | 25.0 J/TH | -$1.46 |
| Canaan Avalon Made A1366 | #171 | 25.0 J/TH | -$2.38 |
More from 21energy
| Miner | Profit / day |
|---|---|
| 21energy Ofen 3 ProSHA-256 | -$0.33 |
| 21energy Ofen 3 Pro XLSHA-256 | -$0.66 |
| 21energy Ofen 3 BaseSHA-256 | -$0.73 |
Figures updated 23:56 UTC, 9 November 2026, using today’s network difficulty and coin prices. Estimates, not financial advice.