Bitmain Antminer S21+ Hydro 395 TH/s – Bitcoin ASIC miner

Key information about Bitmain Antminer S21+ Hydro 395 TH/s

Bitmain Antminer S21+ Hydro 395 TH/s is a high-performance liquid-cooled ASIC miner designed for efficient Bitcoin mining on the SHA-256 algorithm. This model delivers a hashrate of 395 TH/s with power consumption of about 5925 W, resulting in an outstanding energy efficiency of roughly 15 J/TH in real operating conditions. Such parameters place the S21+ Hydro 395 TH/s among the most efficient BTC miners currently available and make it especially attractive for large-scale farms that want to maximize hashrate per kilowatt while maintaining stable performance under continuous load .

The miner uses an advanced hydro cooling system that circulates coolant through integrated water blocks to keep chip temperatures stable even under sustained full load. This design eliminates the need for high-speed fans on the device itself, significantly reducing noise at miner level and shifting most of the sound to pumps and external equipment. The S21+ Hydro 395 TH/s is built for 24/7 operation in professional environments such as hydro mining rooms, containers and industrial boiler facilities, where it is integrated into a closed liquid loop with pumps, manifolds and heat exchangers.

Specifications

• Model: Bitmain Antminer S21+ Hydro 395 TH/s
• Hashrate: 395 TH/s (SHA-256)
• Algorithm: SHA-256 (Bitcoin and related coins)
• Power Consumption: approximately 5925 W
• Energy Efficiency: approximately 15 J/TH in real conditions
• Cooling Type: hydro cooling (liquid-cooled)
• Input Voltage: 380–415 V AC (three-phase power supply)
• Noise Level: around 50 dB at miner level (most noise from pumps and external infrastructure)
• Release Date: around January 2025
• Dimensions: approximately 339 × 163 × 207 mm (miner body)
• Weight: about 13.1 kg net
• Network Connection: Ethernet (RJ-45)
• Typical Use Case: professional BTC mining farms, hydro containers, boiler rooms and heat-recovery projects

Profitability and ROI of Bitmain Antminer S21+ Hydro 395 TH/s

The profitability of the Bitmain Antminer S21+ Hydro 395 TH/s is driven by its high hashrate of 395 TH/s and excellent energy efficiency of about 15 J/TH, as well as by external factors such as Bitcoin price, network difficulty, pool fees and your electricity cost. To estimate potential income, you can use ASIC mining calculators, entering a hashrate of 395 TH/s and a power draw close to 5925 W for your real operating conditions. This will show expected daily and monthly revenue and help you compare the S21+ Hydro 395 TH/s with other miners in terms of net profit and payback period .

The basic ROI formula remains simple: payback period equals miner price divided by the difference between monthly mining income and monthly electricity bill. Thanks to its very strong efficiency, the S21+ Hydro 395 TH/s can offer a more favorable cost per terahash than older air-cooled generations, especially in regions with industrial electricity tariffs or access to cheap or surplus power. At the same time, Bitcoin price and network difficulty are dynamic, so profitability is not fixed and should be reviewed regularly. Professional operators typically model several scenarios over 12–36 months with different BTC prices, difficulty growth rates and potential heat-recovery benefits to evaluate the long-term potential of this miner.

Advantages of Bitmain Antminer S21+ Hydro 395 TH/s

Outstanding energy efficiency – with about 15 J/TH, the Bitmain Antminer S21+ Hydro 395 TH/s is significantly more efficient than many previous ASIC generations, enabling more hashrate per kilowatt and lower electricity costs per terahash. High hashrate density – 395 TH/s per unit allows you to reach very high total hashrate with a relatively small number of miners, which is important for sites with limited rack space or power distribution points. Hydro cooling – liquid cooling keeps chip temperatures stable, reduces thermal stress on components and removes the need for noisy, high-speed fans on the miner itself, which improves reliability and reduces dust exposure [web:61].

Another key advantage is the potential for heat reuse. Because almost all the power consumed by the S21+ Hydro 395 TH/s is transferred into the coolant, it is relatively easy to integrate this thermal energy into heating systems, dry coolers or industrial processes that require hot water. In cold regions or in buildings with constant heating demand, this allows you to mine Bitcoin and heat premises simultaneously, offsetting part of your electricity cost with useful heat. For industrial projects, multiple S21+ Hydro units can provide substantial thermal power, making them attractive for “mining plus heat” concepts where both BTC and heat are valuable outputs.

Potential drawbacks and what to consider

Complex hydro infrastructure – Bitmain Antminer S21+ Hydro 395 TH/s is not a plug-and-play device for beginners. It requires a properly designed liquid loop with pumps, manifolds, pipes, filters, expansion tanks and heat exchangers, as well as careful attention to coolant quality, possible use of antifreeze, leak detection and regular maintenance. Initial capital expenditure for such infrastructure is higher than for simple air-cooled racks, and errors in hydraulic design can reduce performance or even damage equipment.

Higher entry threshold – as a modern high-efficiency hydro miner, the S21+ Hydro 395 TH/s usually has a higher purchase price than many air-cooled alternatives and requires industrial-grade electrical and hydraulic infrastructure, including three-phase power supply at 380–415 V. Profitability, as with any ASIC, remains sensitive to electricity price, Bitcoin market conditions and network difficulty, so investors should plan with a long-term perspective and be prepared for periods of lower income. The miner reveals its full potential mainly in projects where both competitive power and real opportunities for heat reuse are available.

Who is Bitmain Antminer S21+ Hydro 395 TH/s suitable for?

Bitmain Antminer S21+ Hydro 395 TH/s is best suited for professional mining companies, large-scale investors and industrial projects that already have or plan to build hydro infrastructure and want to maximize efficiency and heat-recovery potential. It is an excellent choice for boiler-room projects, district heating integrations, industrial facilities and high-density mining containers where noise and dust must be minimized and where there is a real demand for hot water or heating. For such projects, the S21+ Hydro 395 TH/s can act both as a powerful BTC miner and as a stable heat source, improving overall project economics.

The model is also attractive for hosting providers specializing in hydro-cooled solutions who want to offer their clients cutting-edge performance with reduced noise at the device level. For experienced miners upgrading from older generations, moving part of the fleet to S21+ Hydro units can significantly increase overall efficiency and open up new possibilities for heat-recovery strategies. In all cases, successful deployment of this miner requires careful electrical and hydraulic design and realistic profitability calculations tailored to the specific site conditions .

How to buy Bitmain Antminer S21+ Hydro 395 TH/s from us

Buying Bitmain Antminer S21+ Hydro 395 TH/s in our shop is straightforward. First, check the current price and availability on this product page and review the key specifications, including hashrate, power consumption, cooling type and infrastructure requirements. If you need help choosing the right number of units or estimating profitability for your electricity rate and potential heat-recovery use cases, contact our support team and we will prepare an individual calculation for your project. We can also help you compare this model with other hydro and air-cooled ASIC miners if you are building a mixed fleet.

After you confirm the configuration, add the Antminer S21+ Hydro 395 TH/s to your cart and proceed to checkout. We support secure payment methods, including bank transfer and cryptocurrency, and for bulk orders we can reserve miners after receiving a deposit. Once payment is confirmed, we test the devices before shipment, carefully pack them and arrange delivery with tracking so you can monitor the order on its way. Our team also provides basic guidance on integrating the miners into your hydro loop, connecting them to mining pools and monitoring performance, so you can start mining and using the recovered heat as quickly as possible.

Bitmain Antminer S21+ Hydro 395 TH/s Video Review

To increase user engagement on the product page, you can embed a video review of the Bitmain Antminer S21+ Hydro 395 TH/s that shows real hashrate, power consumption, coolant temperatures and stability under load in a working hydro setup. A video overview helps potential buyers understand how the miner behaves in practice, what to expect during installation and how quiet and efficient a correctly designed hydro-cooled Bitcoin mining system can be.