For a high-efficiency air-cooled Bitcoin miner among the models compared here, the Bitmain Antminer S21 XP leads at a typical 270 TH/s and 13.5 J/TH. The S21 Pro and S21 are less efficient but may suit buyers prioritizing a different balance of hashrate and acquisition cost. All three draw about 3.5–3.65 kW, so power, heat, noise, and hosting often matter more than the headline hashrate. These specifications do not establish which rig is most profitable for you.
Bitcoin mining rigs compared
Competitive Bitcoin mining uses SHA-256 ASIC servers—specialized machines built to perform the hashing work Bitcoin requires. The three air-cooled S21 models below are direct comparisons from Bitmain specifications updated in 2024. Their hashrate, power, and efficiency figures are typical specification values, not guaranteed results from a particular unit in operation.
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| Model | Typical hashrate | Typical power | Typical efficiency | Cooling and requirements | Potential fit |
|---|---|---|---|---|---|
| Bitmain Antminer S21 | 200 TH/s | 3,500 W | 17.5 J/TH | Air-cooled; 220–277 V AC; listed operating temperature 0–45 °C | A baseline S21 option where acquisition cost is a priority. |
| Bitmain Antminer S21 Pro | 234 TH/s | 3,510 W | 15 J/TH | Air-cooled; 220–277 V AC; up to 76 dBA under maximum fan conditions | A middle option between the S21 and S21 XP. |
| Bitmain Antminer S21 XP | 270 TH/s | 3,645 W | 13.5 J/TH | Air-cooled; 220–277 V AC; up to 76 dBA under maximum fan conditions | The most efficient air-cooled model in this comparison. |
| Bitmain Antminer S21 XP+ Hyd | 500 TH/s (TechRadar listing, 2025) | 5,500 W (TechRadar listing, 2025) | Not stated by TechRadar’s 2025 guide | Liquid-cooled; approximately 400 V industrial connection | A high-capacity professional or hosted deployment with appropriate electrical and liquid-cooling infrastructure. |
The S21 XP specifications state that actual hashrate may fluctuate by ±3%, and actual power and efficiency by ±5%. The figures in the table should therefore be treated as typical ratings, not guaranteed field performance. Bitmain’s listed S21-family requirements include 20 A input; verify the specific unit’s documentation and have a qualified electrician assess the service, wiring, and protection before installation.
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Choose by efficiency if electricity is your main constraint
Efficiency is expressed in joules per terahash (J/TH): lower is better because the machine uses less energy for each unit of hashing work. On the listed typical figures, the order is S21 XP at 13.5 J/TH, S21 Pro at 15 J/TH, then S21 at 17.5 J/TH. The XP delivers the highest hashrate of the three, but it also has the highest listed wattage. Its efficiency means it performs more hashing for the energy it draws; it does not mean its total power demand is small.
#1 Best Overall
- SLOT - 6/8/12 GPU slots, support 2 ATX power supplies.
- MATERIAL - The open air mining frame case made up of the highest quality stainless steel material, strong, durable and available. Fully protecting your GPU and eectronic device.
- PERFECT DESIGN - Professional design for mining rig frame, accelerating the air convection, super cooling design for heat dissipation. Enough space reserved between the graphics cards.
- EASY TO INSTALL - Easy to install and strong structure. Keep all cables clean and organized, along with everything in your mining machine.
- NEED TO ASSEMBLE BY YOURSELF - For installation steps, please refer to the user manual. The Frame Only, Not includes Fans or other CPU, GPU, PSU, Motherboards, Cables. If you are not 100% satistifed with this Miner, please feel free to contact us, we will offer you a satisfactory soluiton within 24 hours.
Choose by total cost, not hashrate alone
A higher TH/s rating means more hashing capacity, but it cannot by itself show whether a machine will earn more than it costs to run. Compare the purchase and shipping cost, electricity, pool fees, expected uptime, repairs, cooling, facility or hosting charges, and eventual resale value. The cited figures do not provide a location-specific profitability calculation or a current ROI winner. Bitcoin price, network difficulty, local electricity rates, and operating conditions can change the result.
How much power and heat does an S21 use?
At its listed typical power, an S21-family miner running continuously would consume about 84 kWh per day for the 3,500 W S21, 84.24 kWh per day for the 3,510 W S21 Pro, or 87.48 kWh per day for the 3,645 W S21 XP. These are arithmetic estimates from the manufacturers’ typical wattage ratings multiplied by 24 hours; real consumption can vary. Multiply the daily use by your electricity rate to estimate the energy charge, then add any applicable fixed charges and other operating costs.
Rank #2
- Genuine New Canaan Avalon Q Miner with full manufacturer warranty. Trust a reliable seller – no used or refurbished units
- Maximize profits with 90TH/s hash rate at just 18.6J/TH – one of the most energy-efficient ASIC miners for home or business mining
- Ready to mine right out of the box! Includes a 110V-240V power cord for seamless setup in any standard outlet
- Designed for home-friendly mining with advanced noise reduction – mine Bitcoin without disturbing your household
- Note: All products we offer are brand new and in pristine condition. Returns are accepted. If the return is not due to a verified product failure, a restocking fee will be deducted from your refund to cover handling and logistics costs.
Nearly all the electricity used by an operating miner becomes heat that the room or facility must remove. Air-cooled units exhaust that heat and need a suitable path for intake and exhaust air; placing one in an ordinary living space can make temperature and noise difficult to manage. Bitmain lists the S21 Pro and S21 XP at up to 76 dBA under maximum fan conditions. Plan ventilation, heat rejection, and noise isolation before buying rather than treating them as afterthoughts.
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It may be possible where the building has suitable electrical service and a practical way to manage sustained heat and noise, but these are not plug-in consumer devices. The S21 family is specified for 220–277 V AC and 20 A input. A qualified electrician should confirm that the service, circuit, wiring, and protection are suitable for the exact model and installation; voltage and current requirements vary by building and electrical code. Do not assume a standard household outlet is adequate.
Rank #3
- ⚡ Efficient Home ASIC Miner – Up to 1.1 TH/s hashrate with just 18W power consumption (15 J/TH), perfect for home or small office use.
- 🇪🇺 Made in Europe – Designed and manufactured in Europe with premium components for reliability and long-term performance.
- 🔧 BM1370 ASIC Chip (Antminer S21 Pro) – Same chip used in the Antminer S21 Pro for professional-grade mining power in a compact, open-source form.
- 📡 Wi-Fi & USB-C Connectivity – No monitor or keyboard required – configure and monitor easily via web interface
- 🎁 Complete Kit Included – Delivered fully assembled with EU/UK/US 5V 6A power supply, premium fan, 3D-printed stand, and OLED display.
- Confirm the miner’s exact input requirements and the capacity of the electrical service.
- Plan a safe, continuous route for cooling air and hot exhaust.
- Check whether the sound level and operating hours are acceptable for the building and its occupants.
- Account for continuous energy use and downtime, not just the miner’s purchase price.
If those constraints cannot be met safely or comfortably at home, compare the full cost and terms of an established hosting facility. Hosting shifts facility and cooling responsibilities but adds fees and reliance on the operator; it does not remove mining’s economic risks.
When does the S21 XP+ Hyd make sense?
The S21 XP+ Hyd is a different class of deployment from the air-cooled S21 models. TechRadar’s buyer guide, last updated 3 December 2025, lists it at 500 TH/s and 5,500 W and describes it as a self-contained liquid-cooled ASIC. The guide also notes that it requires an industrial power connection, which can limit home installation. Its approximately 400 V connection and liquid-cooling needs point toward professional facilities or hosting with the required infrastructure, rather than a like-for-like home upgrade. TechRadar does not state an efficiency figure in the cited guide, so it cannot be ranked against the air-cooled models on J/TH from these figures.
Rank #4
- SUPERIOR HASHING POWER: Unlock 13.8 TH/s of mining performance with the updated Rev 3.1 architecture. Engineered for SHA-256 algorithm efficiency, this unit provides a powerful and consistent hashrate for Bitcoin and compatible cryptocurrency mining.
- ULTRA-LOW ENERGY CONSUMPTION: Experience the perfect balance of performance and efficiency. Running at a remarkably low 230W, this miner maximizes your output while keeping your electricity costs manageable, making it the ideal choice for 24/7 sustainable home mining.
- WHISPER-QUIET LIQUID COOLING: Designed specifically for home environments, our advanced integrated hydro-cooling system dissipates heat effectively while maintaining near-silent operation. Enjoy high-performance mining without the noise disturbance typical of industrial-grade equipment.
- PLUG-AND-PLAY SETUP: Get started in minutes with our user-friendly, open-source interface. The device features integrated Wi-Fi connectivity and an intuitive dashboard, allowing both beginners and experienced enthusiasts to manage their mining pool settings with ease.
- COMPACT & ROBUST DESIGN: Built with durability in mind, the Rev 3.1 features a sleek, space-saving form factor that fits perfectly on any desk or shelf. It includes a high-quality power supply unit (PSU) and is ready for immediate deployment in your home or office.
ASIC miners versus PCs
An ASIC is purpose-built for SHA-256 mining and is not readily repurposed for unrelated algorithms or general computing. That specialization is why an ASIC is the relevant class of machine for competitive Bitcoin mining. A GPU or CPU system offers more flexibility for other workloads, but the cited buyer guide does not establish a current profitability comparison between those systems and Bitcoin ASICs. Choose based on the work you intend to do, not on an assumption that a general-purpose PC can substitute for a Bitcoin mining ASIC.
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Quick Recap
Best Value
- ✅Premium Aluminum Construction: Constructed from high-quality aluminum for enhanced durability and heat dissipation, ensuring longevity and optimal performance.
- ✅ Accommodates 8 GPUs: Designed to house up to 8 graphics cards, providing ample space for expanding your mining setup and maximizing efficiency.
- ✅ Superior Airflow and Cooling: Engineered with optimized airflow design to prevent overheating and maintain optimal operating temperatures for prolonged mining sessions.
- ✅ Easy Assembly: Simple and straightforward assembly process allows for quick setup, getting you up and running in no time.
- ✅ Sleek and Space-Saving Design: Compact and minimalist design saves space while adding a professional touch to your mining rig setup.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
