How to Choose an ASIC Miner: 8-Step Guide

Short answer: choose an ASIC miner by working backwards from what you already have: the coin you want to mine, the power you can supply, the space and noise you can live with, and your electricity price. Only then compare models. Compare them on efficiency, measured in joules per terahash (J/TH), as well as hashrate. Keep your power bill and a tape measure nearby for the eight steps below.

This guide covers SHA-256 (Bitcoin) miners first, with notes for other coins where the steps differ. It does not predict earnings: mining results change with network difficulty, coin prices and electricity costs, and Bitminers does not guarantee mining profitability.

Step 1: Decide which coin and algorithm you are mining

An ASIC miner runs one hashing algorithm and cannot switch. A Bitcoin miner runs SHA-256; a Litecoin and Dogecoin miner runs Scrypt; a Kaspa miner runs kHeavyHash. Pick the coin first, because it decides the whole list of machines you can choose from.

Bitcoin: Bitcoin miners (SHA-256)
Litecoin and Dogecoin: Scrypt miners
Kaspa: Kaspa miners
Everything else: see which coins can still be mined

If you are new to the hardware itself, What is an ASIC miner? explains what is inside the box.

Step 2: Define your scale and location

A machine that suits a warehouse is a poor fit for a spare bedroom, so decide where the miner will run:

Home or office, one unit: small home and solo miners that run from a normal outlet. They hash far less, and their rated noise is far lower (see Step 7). See home and solo miners and home Bitcoin miners compared.
Garage, shed or small shop, one to a few units: full-size air-cooled miners, if you can supply 200 to 240 V power and move the hot air outside.
Dedicated facility: rows of air-cooled units, or hydro and immersion miners with their own cooling loops. Planning for this scale is covered in how to plan a Bitcoin mining farm and mining containers explained.

Step 3: Check your electrical supply before you shop

Read the input voltage and power draw on the product page, then compare them with your circuit:

Most full-size air-cooled miners draw about 3,000 to 3,700 W and need a 200 to 240 V circuit.
Hydro-cooled units can draw 5,000 to 11,000 W or more and are designed for facilities with high-capacity power.
The National Electrical Code (NFPA 70, section 210.20(A)) sizes a breaker at no less than 125% of a continuous load, meaning one that runs for 3 hours or more. That is the same as keeping a continuous load to 80% of the breaker rating. A miner runs around the clock, so on a standard US 120 V household circuit a 15 A breaker should carry no more than 12 A, and a 20 A breaker no more than 16 A. Divide the miner’s watts by 120 to get its amps: a 1,000 W load is about 8.3 A, which fits a 15 A circuit; a 3,500 W miner would need about 29 A at 120 V, so it belongs on a 240 V circuit.

Our product pages state the rated power and input voltage for each model, and many include a short answer on whether the unit can run from a US outlet. If you are adding a circuit, have a licensed electrician size the wiring and breaker.

Step 4: Compare efficiency, not just hashrate

Hashrate (TH/s for Bitcoin) is how much work a miner does. Efficiency is how much electricity it uses for that work, measured in joules per terahash. Divide watts by terahashes to get it: a 3,500 W miner producing 200 TH/s runs at 17.5 J/TH. Lower is better.

Efficiency matters more over time than hashrate, because network difficulty rises as others add machines. Your miner’s hashrate stays the same, but its share of the network shrinks, and the efficient machines are the ones that stay worth running. Hashrate, terahash and J/TH explained covers the units, and ASIC miners compared by efficiency ranks current models.

Step 5: Work out the daily electricity cost

Electricity is usually the largest ongoing cost, and it is the one number you can pin down before you buy. Multiply the miner’s kilowatts by 24 hours, then by your rate:

3,500 W is 3.5 kW. Over 24 hours that is 84 kWh.
At $0.10 per kWh, 84 kWh costs $8.40 per day. At $0.15 per kWh it costs $12.60.

Compare that with an estimate of the machine’s revenue at today’s network numbers. Our ASIC miner profitability calculator does this with your own inputs, and what is hashprice? explains the revenue side. Treat any estimate as a snapshot: it changes with difficulty, coin price and transaction fees.

Step 6: Choose a cooling type you can support

Air-cooled: the simplest to install. They need a steady supply of cool air and a way to vent hot air, and they are loud, often 70 to 80 dB.
Hydro (water) cooled: no fans on the miner itself, but they need a coolant loop, pumps and a heat exchanger. Browse hydro-cooled miners or read air cooling vs hydro cooling.
Immersion: the miner sits in a tank of dielectric fluid. See immersion cooling explained and immersion miners.

Almost every watt a miner uses turns into heat, so a 3,500 W miner heats a room like a 3,500 W space heater. Plan the airflow before the machine arrives.

Step 7: Plan for noise

Check the rated noise on each product page. Full-size air-cooled miners are too loud for living space. Home units are rated far lower: the Bitaxe Gamma 601 listing gives 35 dB and the Avalon Nano 3S listing gives 40 dB. If the miner will run near people, noise may decide the model for you.

Step 8: Confirm condition, warranty, shipping and returns

Before you pay, make sure you know exactly what you are buying and what happens if it arrives faulty:

Condition: check whether the unit is new, used or refurbished. Bitminers sells new units, and each product page states the condition.
Warranty: Bitminers gives a 30-day limited warranty from the date of delivery, and a manufacturer warranty may also apply. See the warranty policy.
Shipping: flat-rate US shipping is $120 per order. See the shipping policy.
Returns: 20 days. See the return and refund policy.
Exact model and batch: the hashrate and power on the listing should match the machine you receive.

Where to buy ASIC miners in the US has a fuller checklist for judging any seller.

Common mistakes to avoid

Do not buy on price alone: a cheap, inefficient miner can cost more in electricity than the coins it mines are worth. Do not skip the electrical check either, because a miner that trips the breaker or overloads wiring is a safety problem as well as a cause of downtime. Heat and noise decide where the machine can run, and moving it later is expensive. Finally, you will need a mining pool account and a wired network connection before the miner can do anything; see mining pools explained.

Checklist before you buy

Coin and algorithm
Exact model, hashrate and power draw
Efficiency in J/TH
Input voltage, and the amps at your voltage
Cooling type and where the heat will go
Rated noise
Daily electricity cost at your rate
Condition, warranty, shipping and returns

Frequently asked questions

Is the miner with the highest hashrate always the right choice?

No. A higher hashrate usually comes with a higher power draw. Compare efficiency in J/TH and your daily electricity cost, and check that your circuit and cooling can support the machine.

Can I run an ASIC miner on a normal US outlet?

Small home and solo miners can. Most full-size miners draw 3,000 W or more and need a 200 to 240 V circuit. At 120 V, keep a continuous load to 12 A on a 15 A circuit or 16 A on a 20 A circuit.

Should beginners choose an air-cooled miner?

Air cooling is the simplest to install, but full-size air-cooled miners are loud and hot. For a first machine at home, a small home miner is easier to live with; for a garage or shop, an air-cooled unit with good ventilation is the usual choice.

How do I estimate a miner’s electricity cost?

Multiply its power in kilowatts by 24 hours and by your price per kWh. A 3,500 W miner uses 84 kWh a day, which costs $8.40 at $0.10 per kWh.

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How to Choose the Right ASIC Miner for Your Bitcoin Mining Operation