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A sound first-pass estimate follows five steps: list every miner and its specified wall power, define exactly what the facility boundary includes, add cooling and other auxiliary loads without double-counting, convert the in-boundary electrical load into heat, and test an air- or liquid-cooling design against the site’s climate, water, utility and equipment limits. The result is a planning estimate—not construction-ready electrical or mechanical design.
What the estimate must answer
A mining-site estimate has two linked outputs:
- Electrical demand: the power the utility, transformers, switchgear, distribution equipment and cooling plant must supply.
- Thermal demand: the heat that must be carried away while miners remain within their specified inlet conditions.
They cannot be sized independently. Fans, pumps, evaporative equipment, chillers and controls consume electricity, and that electricity generally becomes additional heat inside the facility boundary. A site can have enough capacity for the ASIC nameplate load yet still fail because its cooling path, air distribution, water system or heat-rejection equipment is undersized.
Use the estimate to compare site options, determine whether a proposed miner count is plausible and identify the information an engineer must verify. Final design requires the exact equipment documentation, local weather design data, utility information, applicable electrical and mechanical codes, and qualified site engineering.
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Start with a row for every miner model and operating mode. Do not use hashrate, efficiency in joules per terahash, or a product-family average as a substitute for specified watts. Record the source and revision date of each specification because firmware, operating mode and hardware revisions can change the load.
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| Field | Why it matters |
|---|---|
| Model and hardware revision | Different revisions can have different power, airflow and temperature limits. |
| Quantity | Determines the number of identical loads in the row. |
| Wall-power specification | Use the stated operating or maximum value that matches the planned mode. |
| Input voltage and phase | Determines how the load can be distributed through panels, transformers and power supplies. |
| Airflow or liquid requirements | Sets the cooling-path inputs for fans, pumps, manifolds and heat exchangers. |
| Allowable inlet conditions | Defines the temperature, humidity and other limits that the cooling system must maintain. |
| Source and date | Preserves the basis of the estimate and flags specifications that need reconfirmation. |
For each row, calculate:
ASIC load (kW) = quantity × specified wall power (W) ÷ 1,000
Then sum all rows. Keep typical, expected and maximum values in separate columns when the documentation provides them; do not silently replace one with another.
Illustrative specification: Antminer S21 XP
ViaBTC’s September 11, 2026 explanation reproduces a model-specific example for the Bitmain Antminer S21 XP: typical wall power of 3,645 W at a 25°C inlet-air condition, typical hashrate of 270 TH/s, and 220–277 V AC single-phase input. The article also notes manufacturer tolerances around the typical figures. These numbers illustrate the method only. Procurement and design should use the current manufacturer specification for the exact revision and operating setting.
For a hypothetical quantity of 10 units using that stated typical value, the ASIC-only calculation is 10 × 3,645 W = 36,450 W, or 36.45 kW. That is not yet the site load because it excludes whatever the chosen facility boundary defines as supporting equipment.
Step 2: Draw the facility boundary and add auxiliary loads
Write one sentence that defines the boundary before adding numbers. Common choices are:
- Miner boundary: only the miners’ wall input.
- Container boundary: miners plus container fans, pumps, controls, networking, lighting and integrated cooling equipment.
- Whole-site boundary: the container or building plus upstream pumps, heat-rejection equipment, offices, transformers, battery systems and other loads that the utility connection must serve.
Every load must belong to one boundary, and a vendor rating must be checked for inclusions before you add it. Otherwise, the same fan, pump or control panel can be counted twice.
| Load category | Typical accounting treatment |
|---|---|
| ASIC miners | Sum quantity multiplied by the specified wall power for each row. |
| Fans and ventilation | Add the electrical input of supply, exhaust and recirculation fans inside the boundary. |
| Pumps and liquid loops | Add pump input, controls and any fluid-conditioning equipment inside the boundary. |
| Evaporative or spray equipment | Add fan and pump input; separately quantify water consumption. |
| Chillers, dry coolers and heat exchangers | Use the equipment’s actual operating input for the design condition, not only its cooling capacity. |
| Networking, controls and lighting | Include switchgear controls, monitoring hardware, lights and other continuous auxiliaries. |
| Upstream site loads | Include them only when the selected boundary is the utility or whole-site boundary. |
Do not double-count an integrated rating
Upstream Data’s 200 kW Hash Hut specification sheet states that its continuous rating is based on a maximum 4,000 W per miner while including ancillary loads. The same sheet lists a maximum cooling ancillary load of 7.5 kW and networking, control and lighting of 0.5 kW. Its stated relationship is:
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ASIC capacity = (continuous power rating − ancillary load) ÷ ASIC load rating
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Those figures describe that product and should not be adopted as a general allowance for another container. If a container’s rating already includes its cooling and controls, separate those loads before calculating how many ASIC watts remain.
Keep demand and energy separate
Report at least three different quantities:
- Average operating demand: the power expected during normal operation.
- Maximum simultaneous demand: the highest combination of miners and auxiliaries that the electrical and cooling systems must support.
- Energy use: demand accumulated over time.
For a steady load, energy (kWh) = power (kW) × operating hours. A continuous 36.45 kW ASIC load, for example, would consume 36.45 × 24 = 874.8 kWh per day before auxiliary loads. Do not turn an arbitrary percentage into a “reserve margin”; any margin should come from the equipment, utility or engineering basis being used.
Step 3: Convert the electrical load into heat
Within a defined indoor or container boundary, nearly all electricity consumed by miners becomes heat that must be removed. BITMAIN’s computer-center guidance describes approximately 98% of electrical consumption changing into heat energy. The exact fraction depends on what crosses the boundary—for example, heat rejected outdoors by equipment located outside it—but the near-equivalence is the appropriate first-pass assumption for ASIC rooms and containers.
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heat (kW) ≈ in-boundary electrical load (kW)heat (Btu/h) = electrical power (kW) × 3,412
ViaBTC’s worked example uses one 3,645 W miner: 3.645 kW × 3.412 ≈ 12,437 Btu/h. At continuous operation, the same miner uses 3.645 kW × 24 = 87.48 kWh per day. The Btu/h and daily-energy figures are arithmetic based on that model-specific example, not field measurements or universal specifications.
Apply the conversion to the complete boundary after auxiliaries are added. Cooling equipment’s electrical input also becomes heat somewhere. If a chiller is inside the building boundary, its compressor and fan heat must be rejected by the building’s cooling path; if the heat-rejection equipment is outside, state that boundary explicitly.
Step 4: Size the cooling path, not just a nameplate
ASHRAE’s Chapter 20 states that the goal of a good datacom cooling design is to match cooling capacity to the actual heat load. That means checking the complete path from miner inlet to outdoor heat rejection, including restrictions, controls, fouling and worst-case weather.
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Air cooling
For a first-pass sensible-heat calculation, the required air mass flow rises with heat load and falls as the permitted air-temperature rise increases:
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air mass flow = heat load ÷ (specific heat of air × allowed temperature rise)air volume flow = air mass flow ÷ site air density
Use the site’s air density rather than assuming sea-level conditions. Then check the selected fan at the actual static pressure, including filters, louvers, ducts, racks, screens and fouling. A fan’s free-air rating is not its delivered flow in a loaded system.
The design must also prevent exhaust air from returning to miner inlets. ASHRAE identifies inlet temperature, upstream air heating and equipment self-heating as interacting factors. BITMAIN guidance emphasizes climate-aware air distribution, filtration, balanced airflow and avoiding dew or condensation. Use the relevant hot-weather design condition and keep every inlet within the exact miner specification; there is no universal airflow-per-miner number that can replace this calculation.
Evaporative assistance
Outside-air systems can use evaporative pads or mist to lower entering-air temperature without a conventional chiller. A U.S. Department of Energy research report modeling 30 MW Texas crypto-mining data-center scenarios includes outside-air cooling with evaporative pad or mist assist and no chillers. Evaporation can reduce mechanical cooling but introduces water use, humidity control, treatment, drift and freeze or scaling concerns. Quantify those effects for the actual climate and equipment rather than assuming that an evaporative system is automatically cheaper or smaller.
Liquid cooling and immersion
For a liquid system, obtain the miner or container supplier’s specified:
- Supply and return temperatures.
- Flow rate, pressure and allowable pressure drop.
- Coolant type and fluid-quality requirements.
- Manifold, pump and heat-exchanger capacities.
- Heat-rejection temperature and ambient design condition.
- Leak detection, isolation and maintenance provisions.
A BITMAIN AntSpace HK3 V2 parameter sheet from 2022 illustrates the level of detail required: 210 miners, up to 1,100 kW total consumption, 52 kW of supporting consumption, 1,000 kW heat dissipation, 230 m³/h spray-pump flow, and external spray-water consumption of 1.15 m³/h. It specifies 35°C miner inlet water and 45°C outlet water. BITMAIN warns that another manufacturer or version may differ, so these are not sizing rules for a different installation.
Liquid-cooled components commonly transfer heat to a facility loop through liquid-to-liquid heat exchangers. The loop still needs pumps, controls, expansion and fluid management, and the outdoor heat-rejection equipment must be sized for the site’s design ambient condition.
Compare cooling architectures against the site
No single architecture is optimal for every mining location. The DOE scenarios demonstrate that outside-air, evaporative-assisted, immersion and dry-cooler/liquid-loop arrangements can all be modeled. Compare the following dimensions before selecting one:
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| Design axis | Air or evaporative-assisted | Water-cooled or immersion |
|---|---|---|
| Climate | Ambient temperature and humidity determine available cooling and recirculation risk. | Ambient conditions affect dry or wet heat rejection and feasible supply and return temperatures. |
| Water | Evaporative pads or mist can consume water; quantify local supply, treatment and discharge. | Closed loops may still use water at towers or spray heat rejection; verify the exact design. |
| Auxiliary power | Fans and evaporative equipment add electrical demand. | Pumps, dry coolers, towers, heat exchangers or chillers add electrical demand. |
| Equipment compatibility | Verify airflow, filtration and inlet-temperature limits for each miner. | Verify container, coolant, flow, pressure and temperature compatibility. |
| Operations | Plan for dust, filters, weather protection, airflow balance and noise. | Plan for fluid quality, leaks, pumps, heat exchangers, controls and maintenance access. |
| Heat recovery | Exhaust air is often lower-temperature heat; assess whether a real use exists. | Warmer liquid loops may offer more useful heat, depending on operating temperatures and heat exchangers. |
Check electrical and thermal constraints together
After calculating the miner and auxiliary loads, test the same operating case against the complete electrical path:
- Confirm that the utility service and site transformer can supply the calculated maximum simultaneous demand.
- Confirm voltage, phase, distribution topology and equipment ratings for the exact miner input requirements.
- Account for cooling and support loads at the same ambient condition used for thermal design.
- Check that panels, feeders, disconnects, protection and grounding are selected by a qualified engineer under applicable codes.
- Verify that the cooling system can reject the calculated heat while maintaining miner inlet conditions, including fan or pump failure scenarios that the design intends to survive.
- Document which loads are continuous, which are intermittent and which can be curtailed when the utility or weather limit is reached.
Do not infer a breaker size, service size, reserve percentage, power-usage effectiveness value or annual operating cost from the miner count alone. Those values depend on the specific electrical design, tariff, climate and operating policy.
Site inputs that can change the answer
Before treating the estimate as a capacity decision, gather:
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- Local design dry-bulb and wet-bulb temperatures, humidity and seasonal extremes.
- Altitude or other conditions that change air density and fan performance.
- Dust, smoke, salt or other contaminants that affect filtration and fouling.
- Water source, pressure, quality, treatment, discharge limits and seasonal availability.
- Utility voltage, available capacity, service limits, outage characteristics and curtailment requirements.
- Noise, footprint, drainage, weather exposure and maintenance access constraints.
- Manufacturer limits for every miner, container, pump, fan, heat exchanger and control system.
Use the hottest relevant design case for cooling and the maximum simultaneous electrical case for distribution. If those cases occur at different times, document both rather than combining them without explanation.
Commissioning and monitoring once miners are running
Measure the variables that connect the calculation to actual operation:
- Per-miner or per-circuit electrical power and total facility demand.
- Miner inlet and exhaust-air temperatures, or liquid supply and return temperatures.
- Fan speed, filter pressure drop and measured airflow where available.
- Pump status, flow, pressure, fluid temperature and leak alarms.
- Outdoor temperature and humidity, plus wet-bulb conditions where evaporative equipment is used.
- Water flow, makeup consumption, treatment status and discharge conditions.
- Hashrate, hardware faults, thermal throttling, automatic shutdowns and curtailment events.
- Alarms, trend data and the operating mode associated with every excursion.
Compare measurements with the manufacturer’s allowable envelope and the design assumptions. A rising inlet temperature with stable miner power points toward airflow, recirculation or heat-rejection capacity. A rising pressure drop suggests filter or coil fouling. A temperature rise with falling liquid flow suggests a pump, valve, blockage or heat-exchanger problem. Unexpected facility demand with stable ASIC readings indicates an auxiliary load or control issue. Investigate the cause before increasing miner count.
Common estimation mistakes
- Using hashrate as power: hashrate describes computation, not wall input.
- Applying one model’s watts to another model: inventory every exact model and mode.
- Ignoring auxiliaries: fans, pumps, controls, networking and lighting can consume meaningful power.
- Double-counting an integrated container rating: identify what the vendor rating already includes.
- Calculating heat from ASICs only: include in-boundary cooling and support equipment.
- Using a free-air fan rating: evaluate flow at actual static pressure and fouling.
- Ignoring recirculation: separate hot exhaust from miner inlets and verify distribution.
- Assuming a generic water figure: flow, temperatures and consumption are configuration-specific.
- Designing for average weather: test the relevant hot and humid condition.
- Treating a planning estimate as stamped design: obtain professional electrical and mechanical review before construction.
A compact worksheet
- List each miner model, quantity, operating mode, wall watts, voltage, phase and inlet limits.
- Calculate and sum ASIC kW by row.
- Write the boundary in plain language and list every included auxiliary.
- Subtract any auxiliaries already embedded in a vendor’s continuous rating before calculating remaining ASIC capacity.
- Report average demand, maximum simultaneous demand and kWh over the intended operating period.
- Convert the complete in-boundary load to heat in kW and, when useful, Btu/h using 3,412 Btu/h per kW.
- Select candidate air, evaporative or liquid paths and collect their flow, temperature, pressure, water and auxiliary-power data.
- Check fans or pumps at real system resistance, reject heat at the local design ambient and prevent recirculation.
- Compare the resulting electrical and thermal demands with utility, equipment, weather, water and code constraints.
- Define commissioning measurements and the operating actions for overheating, low flow, high pressure drop or utility curtailment.
This worksheet produces a defensible first-pass capacity estimate while keeping every assumption visible. It does not replace detailed site engineering, but it tells you exactly where that engineering must begin.
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