Bitmain Antminer S21+ Hydro 358 TH/s – hydro-cooled SHA-256 ASIC miner for Bitcoin

Overview of Bitmain Antminer S21+ Hydro 358 TH/s

Bitmain Antminer S21+ Hydro 358 TH/s is a next-generation hydro-cooled SHA-256 ASIC miner
engineered for industrial Bitcoin mining farms and professional hosting facilities. The
unit delivers a powerful hashrate of 358 TH/s while consuming approximately 5.3–5.5 kW
at the wall, reaching an energy efficiency level around 15 J/TH. This combination of high
performance and low joules per terahash places the S21+ Hydro among the most efficient
Bitcoin miners currently available, making it especially attractive for sites with
competitive electricity rates and long-term mining strategies.

Instead of traditional high-speed fans, the Antminer S21+ Hydro uses a liquid-cooling
system. Coolant circulates through cold plates attached to the hash boards and then moves
to an external cooling station equipped with pumps, radiators and heat exchangers. This
architecture ensures stable chip temperatures, reduces dust accumulation on components and
allows high-density miner deployments with much lower noise directly at the rack. The
device is controlled through Bitmain’s standard web interface, where you can configure
mining pools, set worker names, monitor real-time hashrate and temperatures, and apply
firmware updates and performance profiles.

Profitability and ROI of Bitmain Antminer S21+ Hydro 358 TH/s

The profitability of the Bitmain Antminer S21+ Hydro 358 TH/s depends on five key
variables: Bitcoin price, SHA-256 network difficulty, your pool fee, your electricity
price per kWh and the real power consumption of your hydro setup. With a rated hashrate
of 358 TH/s and power usage around 5.3–5.5 kW, the miner reaches an efficiency close to
15 J/TH, which can significantly reduce operating expenses compared to older generations
with higher energy consumption per terahash. In practice, this means more net Bitcoin
mined for the same electricity budget when you upgrade from less efficient ASICs.

To calculate expected profitability, use any online Bitcoin mining calculator. Enter the
hashrate of 358 TH/s, power draw of about 5370–5500 W, your actual electricity price and
the fee of your chosen pool. The calculator will show the projected daily and monthly
revenue in BTC and in fiat, plus your energy cost and net profit after power. For a quick
payback estimation, apply a simple formula: payback period equals miner price divided by
monthly profit after electricity. By creating conservative, base and optimistic scenarios
with different Bitcoin prices and difficulty growth assumptions, you can estimate how
quickly the S21+ Hydro could pay for itself under various market conditions.

In environments with low to medium electricity rates and stable infrastructure, this
hydro-cooled model often shows a shorter payback period than many air-cooled miners with
similar total hashrate but worse efficiency. At the same time, mining income is never
guaranteed and will fluctuate with Bitcoin price volatility, difficulty adjustments and
halving events. Regularly updating your profitability calculations and managing risk
through portfolio diversification and staged hardware purchases is essential for a
sustainable mining strategy.

Key technical characteristics

• Algorithm: SHA-256 (Bitcoin and other SHA-256-based coins).
• Hashrate: 358 TH/s in standard rated mode.
• Power consumption: approximately 5370–5500 W at the wall.
• Energy efficiency: around 15 J/TH under nominal conditions.
• Cooling: hydro-cooling (liquid loop with external cooling station).
• Input voltage: three-phase 380–415 V AC, 50–60 Hz.
• Input current: up to about 12 A per unit at nominal power.
• Form factor: compact hydro module designed for rack or tank integration.
• Noise level: low at the miner itself; most noise is concentrated in the cooling station.
• Intended environment: mining data centres, industrial farms and professional hosting sites.

Advantages of Bitmain Antminer S21+ Hydro 358 TH/s

• Top-tier efficiency and hashrate – 358 TH/s at around 15 J/TH
  offers one of the best performance-to-power ratios in the SHA-256 segment, which
  helps reduce the cost per mined Bitcoin over the long term.
• Hydro-cooling for thermal stability – liquid cooling maintains
  stable chip temperatures, minimises thermal throttling and extends component
  lifetime, even in dense racks and hot climates.
• High-density deployment – the hydro design allows you to place
  many units close together and offload heat to a central cooling loop rather
  than filling the mining room with hot air.
• Reduced dust and noise at the rack – without high-speed fans
  blowing air through the chassis, the device accumulates less dust and produces
  much less noise directly in the miner room, which is important for data-centre
  environments.
• Optimised for professional farms – three-phase input, industrial
  connectors and firmware tuned for 24/7 operation make the S21+ Hydro a natural
  choice for large-scale Bitcoin mining operations and hosting providers.

Potential drawbacks and what to consider

• High power requirement per unit – with more than 5.3 kW of
  continuous draw, each miner needs robust three-phase electrical infrastructure
  with properly sized cabling, breakers and distribution.
• Complex hydro-cooling setup – to operate the S21+ Hydro you must
  install or connect to a liquid-cooling loop with pumps, heat exchangers,
  coolant, monitoring and safety systems, which increases initial capital
  expenses and design complexity.
• Not suitable for home use – due to its power draw, three-phase
  requirement and dependence on a hydro loop, this miner is intended for
  industrial or professional sites, not for residential premises or small office
  setups.
• Exposure to BTC market volatility – profitability depends on
  Bitcoin price and network difficulty; long bear markets or rapid hashrate
  growth can extend the payback period significantly.
• Generational competition – as new ASIC generations arrive with
  even better efficiency, the relative advantage of the S21+ Hydro will gradually
  decrease, so it is important to consider lifecycle, depreciation and possible
  resale value.

Who is Bitmain Antminer S21+ Hydro 358 TH/s suitable for?

Bitmain Antminer S21+ Hydro 358 TH/s is designed for professional miners, industrial
data centres and hosting companies that want to maximise hashrate density while
controlling energy costs and heat management. It is an excellent option for projects
that are building or already operating liquid-cooled mining containers or halls and
are ready to invest in centralised hydro infrastructure. For operators upgrading from
older air-cooled fleets, integrating S21+ Hydro units can significantly improve
overall efficiency and reduce operating costs per terahash across the farm.

The model is also suitable for long-term investors who view Bitcoin mining as a
strategic infrastructure play rather than a short-term speculation. When deployed in
a well-designed electrical and cooling ecosystem, the S21+ Hydro can deliver stable
operation and predictable energy usage across multiple difficulty cycles and halving
events, helping you plan your mining business for years ahead.

How to buy Bitmain Antminer S21+ Hydro 358 TH/s from us

To buy the Bitmain Antminer S21+ Hydro 358 TH/s from us, start by checking the current
price, stock status and detailed specifications on this product page. If you need
assistance with profitability calculations for your electricity price or want help
designing the necessary power and hydro-cooling infrastructure, contact our team and
we will prepare individual recommendations and sample ROI models tailored to your
project, including the number of units, expected energy consumption and potential
monthly income.

When you are ready to place an order, add the Antminer S21+ Hydro 358 TH/s to your
cart and complete the checkout process. We support secure payment methods such as
bank transfers and cryptocurrency payments, and for bulk purchases we can offer
flexible pricing, volume discounts and customised delivery terms. After payment is
confirmed, each miner is tested before shipment, carefully packed and dispatched
with tracked delivery so you can monitor its journey from our warehouse to your
mining facility.

Our support does not end with shipping. After you receive your Bitmain Antminer
S21+ Hydro 358 TH/s, our specialists can help you integrate the miner into your
hydro-cooling loop, connect it to your preferred Bitcoin mining pool, configure
network settings and update firmware. This ensures that you can start mining as
quickly as possible and keep your equipment running safely, efficiently and
profitably throughout its lifecycle.