Antminer S9i
Improved S9 variant with slightly better efficiency. Same form factor as S9. Common in space heater builds.
Quick answer
The Antminer S9i is a Bitcoin miner rated about 14 TH/s at roughly 1,320 W (about 94.29 J/TH), built on 189× BM1387. An industrial-class unit — loud and power-hungry, best suited to a dedicated mining space, not living areas.
DCENT_OS Compatible
DCENT_OS is custom firmware developed by D-Central Technologies specifically for home miners. It transforms this miner with whisper-quiet fan profiles, 120V North American outlet support, auto-tuning for maximum efficiency, heater mode integration, and a clean web dashboard for monitoring.
Miners running DCENT_OS score higher on our Home Mining Assessment because the firmware is purpose-built to make industrial hardware livable in residential spaces.
Learn More About DCENT_OS →Professional-Grade Miner
This miner draws 1,320W and produces 76 dB of noise — it is designed for dedicated mining environments, not living spaces. Professional-grade miners deliver the highest hashrate and revenue per unit but require proper infrastructure: a 240V circuit, adequate ventilation or exhaust ducting, and a space where noise is not a concern (garage, basement, warehouse, or outdoor enclosure).
However, this miner is compatible with DCENT_OS — D-Central's custom firmware that adds whisper-quiet fan profiles and 120V North American outlet support. With DCENT_OS installed, this industrial miner can be transformed for home use.
Heater-Class Miner
At 1,320W, this miner outputs approximately 4503.8 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 | $0.44 | $2.22 | $-1.78 |
| Weekly | $3.10 | $15.52 | $-12.43 |
| Monthly | $13.27 | $66.53 | $-53.26 |
| Yearly | $161.45 | $809.42 | $-647.98 |
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.
Buy from D-Central
In stock and ready to ship from Laval, Quebec.
Where to Buy the Antminer S9i
D-Central Technologies
CanadaBitcoin Mining Hackers since 2016. Ships from Laval, Quebec.
Full Specifications
| Model | Antminer S9i |
|---|---|
| Model Number | S9i |
| Manufacturer | Bitmain |
| Algorithm | SHA-256 |
| Coins Mined | Bitcoin (BTC) |
| Hashrate | 14 TH/s |
| Power Consumption | 1,320 W |
| Efficiency | 94.29 J/TH |
| Noise Level | 76 dB |
| Chip Model | BM1387 |
| Chip Count | 189 |
| Cooling | Air |
| Voltage Range | 100-240V AC |
| Operating Temperature | 0-40°C |
| Dimensions | 350x135x158 |
| Weight | 4.2 |
| Interface | Ethernet |
| BTU Output | 4503.8 BTU/hr |
| Equivalent Heater | Half a standard space heater (4,504 BTU/hr) |
| Daily Power Cost | $2.22/day |
| Monthly Power Cost | $66.53/mo |
| Circuit Requirement | Standard 120V 15A |
| Release Date | 2018-05-01 |
| Status | Discontinued |
Home Mining Assessment
Improved S9 variant with slightly better efficiency. Same form factor as S9. Common in space heater builds.
The Antminer S9i is a SHA-256 cryptocurrency miner manufactured by Bitmain. It delivers a hashrate of 14 TH/s with a power consumption of 1320W, achieving an efficiency of 94.29 J/TH.
Built on the BM1387 ASIC chip, uses air cooling, operates at 76 dB noise level, weighs 4.2 kg, measures 350x135x158.
With a home mining score of 22/100, this miner is best suited for dedicated mining spaces for residential use. It produces 4503.8 BTU/h of heat output, making it suitable for supplemental space heating.
At 94.29 J/TH, the Antminer S9i 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 4503.8 BTU/h) can be ducted into a room, turning money you would otherwise spend on heating into hashrate.
D-Central’s in-house technicians repair the Antminer S9i. DCENT_OS, D-Central’s GPL-3.0 open-source Antminer firmware, is in active closed beta on the Antminer S9i today (public beta planned for summer 2026 — an estimate; it is experimental and can brick your miner).
View detailed specifications, real-time profitability calculations, and comparison data for the Antminer S9i in our comprehensive ASIC miner database.
Broken miner? Get a real quote.
Tell us the symptom and get an instant repair-tier estimate ($95 / $145 / $195 CAD). Mail-in from across Canada, bench in Laval, Quebec.
Send it to D-Central — start a repair →Antminer S9 specs, heater path, and parts
Use the S9 cluster to route legacy miner owners to specs, repair guidance, APW3 power parts, hashboard bundles, and heater use cases.
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Common Antminer S9i Error Codes
Known error codes and troubleshooting guides for the Antminer S9i. Click any error for step-by-step repair instructions.
Frequently Asked Questions
What are the current mining economics for the Antminer S9i?
At $0.07/kWh, the Antminer S9i currently shows an estimated daily net cost of $1.78 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 Antminer S9i?
The Antminer S9i has a home mining score of 22/100. With 76 dB noise and 1,320W power draw, it may require a dedicated space like a garage, basement, or outdoor enclosure. Consider noise insulation and proper ventilation.
Can the Antminer S9i heat my home?
The Antminer S9i outputs approximately 4503.8 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.
Does D-Central repair the Antminer S9i?
Yes, D-Central provides professional repair services for the Antminer S9i. Services include hashboard repair, control board diagnostics, fan replacement, and full refurbishment. Ship your miner to our Laval, Quebec facility for diagnosis and repair.
What power supply does the Antminer S9i need?
The Antminer S9i draws 1,320W of power. You need a power supply rated for at least 1,452W with appropriate voltage (100-240V 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.