BW L21
Heater-Class Miner
At 950W, this miner outputs approximately 3241 BTU/hr of heat — equivalent to a standard electric space heater. Every watt consumed by an ASIC miner is converted to heat with 100% efficiency, making it a space heater that also mines Bitcoin.
During heating season, miner heat can offset part of the heat a room would otherwise need from another electric heater. The economics depend on your electricity rate, room heat demand, BTC price, network difficulty, and noise constraints.
Profitability Calculator
| Period | Revenue | Electricity Cost | Profit |
|---|---|---|---|
| Daily | $0.00 | $1.60 | $-1.60 |
| Weekly | $0.00 | $11.17 | $-11.17 |
| Monthly | $0.00 | $47.88 | $-47.88 |
| Yearly | $0.01 | $582.54 | $-582.53 |
Heating offset estimates the value of heat replacing an electric space heater during heating season (~6 months/year in Canada). Actual savings depend on your heating setup and climate.
Where to Buy the BW L21
D-Central Technologies is a Bitcoin-only company. For this miner, check out our trusted partner retailers below.
ASIC Miner Market
United StatesWide selection of new and used ASIC miners. US-based shipping.
Shop NowPartner links may earn D-Central a commission at no extra cost to you. Have you considered Bitcoin mining instead? Explore Bitcoin miners →
Full Specifications
| Model | BW L21 |
| Model Number | L21 |
| Manufacturer | BW |
| Algorithm | Scrypt |
| Coins Mined | Litecoin (LTC), Dogecoin (DOGE) |
| Hashrate | 550 MH/s |
| Power Consumption | 950 W |
| Efficiency | 1727272.7 J/TH |
| Dimensions | 130 x 155 x 350mm |
| Weight | 5.8 |
| BTU Output | 3241 BTU/hr |
| Equivalent Heater | Half a standard space heater (3,241 BTU/hr) |
| Daily Power Cost | $1.60/day |
| Monthly Power Cost | $47.88/mo |
| Circuit Requirement | Standard 120V 15A |
| Release Date | 2018-01-01 |
| Status | Active |
Home Mining Assessment
The BW L21 is a Scrypt cryptocurrency miner manufactured by BW. It delivers a hashrate of 550 MH/s with a power consumption of 950W, achieving an efficiency of 1727272.7 J/TH.
Weighs 5750 kg, measures 130 x 155 x 350mm.
With a home mining score of 31/100, this miner is best suited for dedicated mining spaces for residential use. It produces 3241 BTU/h of heat output, making it suitable for supplemental space heating.
At 1727272.7 J/TH, the BW L21 sits in the legacy efficiency tier, so it is most economical run as a space heater or for hobby and learning setups rather than for pure profit.
Its waste heat (around 3241 BTU/h) can be ducted into a room, turning money you would otherwise spend on heating into hashrate.
View detailed specifications, real-time profitability calculations, and comparison data for the BW L21 in our comprehensive ASIC miner database.
Related Miners
Bitmain Antminer L9 (16Gh)
VOLCMINER D1 Mini Pre 2.2Gh
Goldshell DG Max
VOLCMINER D1 Hydro (30.4Gh)
Frequently Asked Questions
What are the current mining economics for the BW L21?
At $0.07/kWh, the BW L21 currently shows an estimated daily net cost of $1.60 before pool fees and hardware cost. Lower electricity rates, network changes, BTC price changes, or useful heat recovery can change the result.
Can I mine Bitcoin at home with the BW L21?
The BW L21 has a home mining score of 31/100. With 0 dB noise and 950W power draw, it may require a dedicated space like a garage, basement, or outdoor enclosure. Consider noise insulation and proper ventilation.
Can the BW L21 heat my home?
The BW L21 outputs approximately 3241 BTU/hr of heat. For reference, a typical space heater produces 5,000-5,500 BTU/hr. All electrical energy consumed by the miner is converted to heat, making it 100% efficient as a heater. D-Central offers Bitcoin Space Heater builds designed specifically for home heating integration.
What power supply does the BW L21 need?
The BW L21 draws 950W of power. You need a power supply rated for at least 1,045W with appropriate voltage (200-240V AC). D-Central stocks compatible power supplies in our shop. Always use a quality PSU from a reputable manufacturer to protect the miner and wiring.