Avalon Nano 3S review 2026: is the 6 TH/s home miner worth it?

The Avalon Nano 3S by Canaan is a desktop miner that delivers roughly 6 TH/s at about 140 watts while staying quiet enough not to bother anyone in a living room. It brings its own power supply, is set up through an app or web interface, and after that needs nothing but power and a network connection. For a device the size of a thick book, that hashrate is remarkable.

This Avalon Nano 3S review puts that into context: how much electricity it actually draws, how loud it is in each mode, what the block odds really look like when solo mining – and where it wins or loses against open alternatives such as the Bitaxe Gamma, Nerdaxe Gaia and NerdQaxe++.

The short version: the Nano 3S buys you a lot of hashrate for comparatively little money. You pay for it in efficiency. Per terahash it needs roughly twice the power of a modern open-source miner – and electricity is the bill that comes back every month.

Avalon Nano 3S at a glance

Our rating: 8.0 / 10. Points for hashrate per euro, noise level and a setup that takes ten minutes even without prior knowledge. Deductions for efficiency – 23 J/TH is a clear step behind the roughly 10 J/TH of a Nerdaxe Gaia – and for the closed firmware.

Avalon Nano 3S technical specifications

What the Avalon Nano 3S is like day to day

Setup. Unbox, plug in, connect through the app, enter Wi-Fi and pool. The flow is deliberately built so nobody has to flash firmware or hunt for an IP address. Anyone who has set up a Bitaxe will notice the difference immediately: fewer options, but also fewer ways to get it wrong.

Heat. All 140 watts end up as heat in the room – roughly a laptop under full load. Pleasant in winter, noticeable in a small room in high summer. Canaan explicitly markets the Nano line as a small heater as well. It should still stand in the open; a closed cabinet is the fastest route to throttling and fan noise.

Continuous operation. The device is built for 24/7. Test reports mention isolated cases of overheated USB connectors – not a widespread problem, but a good reason to stick with the supplied power adapter.

How loud is the Avalon Nano 3S?

Short answer: quiet enough for a living room, too loud for a bedroom if you are a light sleeper. The published figures diverge, and there is a reason – almost no source states the measuring distance.

For reference: 30 dB is a very quiet room, 40 dB a soft conversation next door.

• Bedroom: not in high mode. In low mode, tolerable for many people.
• Office or living room: unobtrusive, as long as it is not right next to your head.
• Basement or utility room: completely unproblematic.

A Bitaxe Gamma is audibly quieter – at 15 to 18 watts its fan barely moves. A NerdQaxe++ sits in between at 80 watts. If you need maximum quiet, run the Nano 3S in low or medium mode: you lose hashrate but barely any efficiency.

Power consumption and electricity cost

The formula is simple: watts ÷ 1000 × 24 × 30 × price per kWh gives the monthly cost. High mode draws 140 W, so 100.8 kWh per month and 1,226 kWh per year.

The work modes change that considerably, calculated at €0.30/kWh:

Worth noting: at 21.3 J/TH, low mode is actually more efficient than high mode at 23.3 J/TH. You pay disproportionately for the last 1.2 TH/s. If the electricity bill matters to you, run medium – 80 percent of the hashrate for 74 percent of the draw. Run your own numbers in the mining calculator.

Efficiency: is 6 TH/s at 140 watts good?

J/TH (joules per terahash) tells you how much energy a miner needs for the same work. Lower is better. Over time this single number decides more about your cost than the purchase price does.

Two things stand out. First: the Nano 3S is the cheapest hashrate in the field. €49.83 per TH/s undercuts everything else clearly. Second: it is also the least efficient. Compared to the Nerdaxe Gaia it needs roughly 2.4 times the energy per terahash.

An honest comparison adds both together. For roughly equal hashrate you would need two Gaia – 5.2 TH/s at 50 watts for €398. That is €99 more upfront, but €132 instead of €368 of electricity per year. After about five months of continuous operation the more efficient option has made up the price difference.

More TH/s therefore does not automatically mean the better miner. For an hour a day efficiency barely matters; for 24/7 it decides everything. All devices side by side in the miner comparison.

Solo mining with the Avalon Nano 3S

When solo mining you are not working for a pool that splits rewards by share – you are trying to find a complete block yourself. If you do, the full reward is yours: currently 3.125 BTC plus fees. If you do not, you get nothing.

Every hash is its own lottery ticket. The probability rises linearly with hashrate: 6 TH/s is exactly 4.6 times as many attempts as the 1.3 TH/s of a Bitaxe Gamma – no more, no less.

With network data from 26 August 2026 (difficulty 125.807 T, network hashrate 893.6 EH/s) a block takes 5.4 × 10²³ hashes on average. For 6 TH/s that gives:

For comparison, same calculation: a Bitaxe Gamma comes to roughly 13,170 years, a Nerdaxe Gaia to 6,585, a NerdQaxe++ to 3,567 and a NerdOctaxe Hydro at 14 TH/s to 1,223 years.

Important context: treat the electricity cost for what it is – the price of participating. At €368 a year and annual odds of 1 in 2,853, this is a lottery ticket, not a savings plan.

Can the Avalon Nano 3S find a whole Bitcoin block?

Yes, technically it can. There is no lower limit below which a miner would be "too small" for a block.

A valid block exists when any hash falls below the current target. Whether that hash comes from a farm with 100,000 machines or from the Nano 3S on your desk makes no difference to the network – the block is accepted under the same rules and you receive the full reward.

What size changes is only the frequency of attempts. At 6 TH/s the chance is about 1 in 1,042,316 per day. Small, but not zero – and that is exactly the appeal for many home miners. For this to work you need to mine against a solo pool that pays the whole block to you. Our own solo pool works without registration.

Avalon Nano 3S vs Bitaxe Gamma

Take the Bitaxe Gamma if you want to understand how mining works, if the device sits next to your bed, or if low running costs matter more than absolute hashrate. Take the Avalon Nano 3S if you want 4.6 times the block odds without touching firmware.

Avalon Nano 3S vs Nerdaxe Gaia

The Nerdaxe Gaia is the more interesting opponent because its much newer BM1373 ASIC delivers the best efficiency in the field right now.

Over three years of continuous operation at €0.30/kWh: the Nano 3S costs €299 plus €1,104 of electricity, so €1,403 for 6 TH/s. Two Gaia cost €398 plus €394, so €792 for 5.2 TH/s. At roughly equal hashrate the open solution is about €600 cheaper over three years.

That is the real argument against the Nano 3S – not the firmware, but the electricity bill.

Avalon Nano 3S vs NerdQaxe++

The Nano 3S is €100 cheaper and 25 percent faster. The NerdQaxe++ saves €158 of electricity per year. After roughly eight months of continuous operation the Avalon's price advantage is used up; after that it becomes the more expensive machine.

It gets interesting in medium mode: there the Nano 3S delivers the same 4.8 TH/s as the NerdQaxe++ but needs 104 instead of 80 watts. The gap shrinks to €63 a year while the Avalon stays €100 cheaper to buy. Switching modes recovers a good part of the efficiency gap.

Open source or closed firmware – does it matter?

Yes, but probably not where you would first expect.

What AxeOS gives you: the source code is readable, so you can see what the device does and where it sends data. You can set frequency and voltage yourself and shift the operating point between efficiency and performance. Pools are freely configurable, updates come from the community, and schematics are documented if something fails. If the manufacturer disappears, the device keeps running.

What the Avalon gives you: a finished product. The app walks you through setup, the modes are tuned to each other, the power supply fits. You can do less wrong because there is less to set.

Both are legitimate answers to different questions. What you concretely give up with the Avalon: the fine tuning that often extracts another 10 to 20 percent of efficiency on open devices, and the option to keep running the machine on new firmware five years from now.

Who is the Avalon Nano 3S right for?

Buy the Avalon Nano 3S if …

• you want the highest block odds per euro spent and efficiency is secondary
• you have no appetite for firmware, tuning and troubleshooting
• the device will only run in winter anyway and the waste heat is welcome
• you have cheap or self-generated electricity – with surplus solar the whole calculation flips
• you are looking for a gift that works without a manual

Take an open miner instead if …

• the device runs 24/7 on a normal household tariff – then efficiency decides
• you mine in the bedroom and every decibel counts
• you want to understand and adjust what is happening
• you want to keep the option of modifying or repairing the device later
• you want to start on a small budget

Pros and cons

For

• 6 TH/s in a case the size of a thick book
• cheapest hashrate in the comparison: €49.83 per TH/s
• three power modes, switchable while running – low is even more efficient than high
• power supply included, no accessories to buy
• setup in under ten minutes, no prior knowledge needed
• freely selectable pool, solo mining possible
• quiet enough for living spaces

Against

• 23.3 J/TH – roughly 2.4 times the energy per terahash of a Nerdaxe Gaia
• about €368 of electricity per year at €0.30/kWh, more than the purchase price
• closed firmware: no tuning, no insight, no community updates
• partly contradictory manufacturer figures (29 J/T versus 23.3 J/TH)
• Ethernet only via adapter depending on version
• isolated reports of overheated USB connectors

Our verdict on the Avalon Nano 3S

The Avalon Nano 3S is the right choice when as much hashrate as possible in an uncomplicated device matters more to you than maximum efficiency and open software. For €299 you get the cheapest block odds in the field, a setup anyone can manage, and a machine that does not stand out in a living room.

The price for that sits on the electricity bill. At 23.3 J/TH it is among the least efficient home miners of its generation, and in continuous operation that costs you more every year than the device itself. If you mine around the clock on a normal tariff, a Nerdaxe Gaia or a NerdQaxe++ works out considerably cheaper over three years despite the higher purchase price.

Our advice: if the device only runs part of the time, in winter or on your own solar power, the Nano 3S is a very good deal. If it runs around the clock on a grid tariff, buy efficiency instead of hashrate. And if you are unsure, run it in medium mode – 4.8 TH/s at 104 watts is the most sensible point on its curve.