Bitcoin Forum

I’m considering adding an S21 Pro to my home mining setup, but I’m hesitant due to the high electricity costs here in Ireland. I’m worried the earnings might just cover the electricity bill. My other option is to go for an S21e XP Hydro and host it instead. Any suggestions?

We would need to know your electric rate per kWh, however based on the average rate in Ireland of €0.34, you should expect the following:

Cost to run 1 x S21 Pro per day: €28.64
BTC earnings per day: €13.58

Total loss per day: €15.06

Hosting companies are mostly scams - and very unlikely anyone would host one single unit like that. S21 Hydros require additional equipment, pumps, filters, water infrastructure etc. Typically you will need to invest in 10 units or more, purchased through the hosting company. But expect to get ripped off!

Your best bet would almost certainly be to invest in BTC and hold, rather than mining. As a general rule, you need free or very cheap electric to be profitable in BTC mining. That means around €0.05 per kWh or less

Asicminervalue is showing an estimated profit of '$14.18' daily for Antminer S21 Pro.
The estimated cost of electricity per day's use is '$8.47' - Electricity cost isn't mentioned, so this value varies depending on your electricity cost.

The total estimated profit will be $5.71.

ASICs are expensive, and the stock gets sold more quickly than GPUs. At eBay, sellers usually sell used ASICs cheaply, but I wouldn't go that route.

This is wrong and misleading. You need to configure the OP's electric cost in order to get an 'accurate' approximation from Asicminervalue. You are either using the website default setting (or one specific to you).

Typical power rate in Ireland is 0.34 Euros / €0.34.

S21 Pro uses 3500w or 3.5kW. 3.5 kW x 24 = 84 units per day.

84 x €0.34 = €28.56 daily cost to run.

Asicminervalue earnings figure for S21 Pro = $14.12 (USD) which is €13.55 euro

So... €28.56 running cost, €13.55 earnings = MASSIVE LOSS

Yes, I am using the website's default preset. I don't know OP's electricity, and it's nowhere mentioned.
I did mention that the total profit will vary based on OP's electricity bill.

S21 Pro's without electricity bill profit is also mentioned (Depending on when the profit is estimated considering the bitcoin's at the moment value).

The average electricity bill in Europe is around 0.28 Eur. Asian countries have even lower, around 0.1$

Understood, and apologies if my response seemed harsh - however I see so many people get caught out here (spending large amounts on miner(s) without realising how important the power cost is), and I didn't want the OP to take false hope from your response. Even if the OP is on the cheapest rate available in Ireland, it will be a huge loss (unless he is generating his own, or has access to free electricity).

I have sold hundreds of used miners over the years, and despite making it very clear how much these cost to run, people still seem to ignore this and assume they will make a profit

It is ok, I didn't take it personally.

I started with GPU mining with a laptop; I did it for months. It was years back. I was new and mining just for the sake of doing something new. I was enjoying the process, and making numbers, I guess that's what most people do who get into mining, it's a learning process, and there's no fixed book on how to mine, tech will continue to evolve, so will hardware.

OP BitSean did not mention their electricity bill. There are, however, cases I've seen where some people can get electricity for cheap, with subsidies and connections (These people make the most profit).

You will also make a profit in bitcoins if you mine them and hold them for a decade or so (This isn't 100% guaranteed, but chances are pretty high if you look at history)

If the op were to mine in house he should consider a piece of gear like this.


https://altairtech.io/product/canaan-avalon-mini-3/

its quiet and serves a duty as a space heater.

it burns 800 watts an hour on high and about 500 on low

so 20 kwatts a day on high
and 12 kwatts a day on low.

that is about  6.8 euros a day on high and about  4.08 euros a day on low

it earns maybe 2.4 euros on high

and maybe 1.5 euros on low.  but you get heat if you need it which has value . As a space heater of 800 watts cost the same 6.8 euros to run giving you 0 euros back.

If he points to viabtc.com and just leaves the coin in set to 0.01 btc for auto withdrawal it is fairly painless way to dca and hodl the coins.

I suggest to get you also Noise cancelling box. Miner box here: https://minerboxes.com/ (https://minerboxes.com/)

We have them in offices and basically for heating we use these boxes. We have cancelled gas heating already :).
Also for testing asic miners after repairs we use these boxes. So the noise does not obstruct our work
This one:
https://minerboxes.com/products/anti-noise-box-antminer-cryptomining-at-home-white
 (https://minerboxes.com/products/anti-noise-box-antminer-cryptomining-at-home-white)
https://minerboxes.com/cdn/shop/files/mb-white-large-6.jpg?v=1710253818

There is also video for this box.
If electricity is expensive just buy that miner including hosting https://oneminers.com/products/antminer-t21-190-th-s (https://oneminers.com/products/antminer-t21-190-th-s) where for exotic country like Ethiopia or Nigeria in hosting.
This miner can produce 5.42 USD per day today. Tomorrow maybe more, maybe less - who knows where BTC price and difficulty will go.
Exact calculation you can find as asicprofit pages here: https://www.asicprofit.com/miners/bitmain/antminer-t21-190th (https://www.asicprofit.com/miners/bitmain/antminer-t21-190th)
https://i.postimg.cc/mrHphVx8/Antminer-T21-190-TH-Bitcoin-miner-profitability-5-USD-per-day-in-hosting-oneminers.jpg

So if you have free electricity or you can benefit from heat than home mining and solar and noise reduction box.
If not go for hosted version. There make sure you are really buying real ASIC miner in real hosting center and not some virtual Cloud services that are basically scam from nature of business.

I suggest buying a Russian noisebox, immediately + 10% to the hashrate and you will get a convenient handle for carrying your system unit :)
A rusty canister from the Soviet Union, such a product will only become more expensive over time

https://www.talkimg.com/images/2025/05/04/U2lrdC.md.jpeg (https://www.talkimg.com/image/U2lrdC)

https://www.talkimg.com/images/2025/05/04/U2l1zb.md.jpeg (https://www.talkimg.com/image/U2l1zb)

Must you buy and run a Bitcoin miner? I don't know why people are making it seem like a do or due thing when it's actually not, Bitcoin mining is not a must but the passive income side have affected many thinking they could get away with anything, Bitcoin mining isn't luck related unless you are a solo miner with very cheap electricity.

Bitcoin mining requires full math before venturing into the business, in your case OP don't try it, and please stop trying to full yourself. You have the clear answer but you don't want to accept it.

I said this because it's clear you knew that electricity isn't cheap in your country but you want someone to confuse you, it's all math, do some calculations, it's best you use the money to buy some Bitcoin and hold it, then go back to your daily life.

As reminder, oneminers dot com is a probable scam mining company (https://bitcointalk.org/index.php?topic=5534176.0). minerboxes dot com also appear to be scam since it list at 3 scam/probable scam website as it's authorized seller.


Or rather, why he even consider mining in first place. Ireland and some parts of Europe have expensive electricity rate (usually $0.2/kWh or higher).

I have already written that mining should be tried if there is a great desire. You can buy an ASIC in Ireland and after a month of mining tell other cryptocurrency miners in Ireland about the advantages of ASIC mining and sell your ASIC. And when the buyer starts talking badly about ASIC and mining, you should explain to him that he will not get rid of the ASIC in this way :)

Bitcoin mining has been questionable profit-wise for the last year or so unless you have minimal upfront cost and a solar/renewable source of energy.

I'm more inclined to mine obscure altcoins and give them a go, but that's me, I like a little bit of fun and uncertainty (doesn't have to be high stakes though).

Dude, over the last 2 years the Bitcoin network hashrate has doubled
https://www.blockchain.com/explorer/charts/hash-rate
Have you looked at the earnings reports of major mining companies before writing this post?
If the investments were questionable, we wouldn't see such growth on the charts.

The s21 xp earns $13.50 and at 10 cent power it burns $8.40

Thus

13.50
- 8.40
$5.10 after power.

That is 1800 a year.

But it does cost 7,000

So that means it will take 4 years to make money.

This?
https://www.asicminervalue.com/ru/miners/bitmain/antminer-s21-xp-hyd-473th
Such an ASIC also needs an additional water cooling system, which will have to be bought or made, but at a price of 5 cents per kilowatt, the payback looks good.
Now it is necessary to use the latest generation of ASICs to have maximum profitability.

That's a completely different context IMHO (major mining companies), as per the OP, we're talking about a scenario of a single user having a machine or two "for fun," and the one my comment was addressed towards.

Firstly, it is a very expensive entertainment to buy an ASIC for 5-7 thousand dollars, which will consume more than 5 kilowatts per hour. You have many risks of ASIC breakdowns, overheating of the electrical network, and so on. Beginners do not buy such equipment. And if the equipment is also water-cooled, then this is an additional problem.

no i meant aircooled version.

not the liquid cooled three phase one.


https://altairtech.io/product/bitmain-antminer-s21-xp/

the aircooled one is above i have four of them.

There are so many models of ASICs with air, water and immersion cooling now that it is very difficult to immediately understand which model is being discussed. I have always been a supporter of air cooling, as the easiest to maintain and proven by 10 years of experience.

also if you have 1 phase 240 volt

refit to three phase is costly.

I purchased a fifth s21 xp it will go on line next week.

Explain what the problem is with a three-phase system if you have your own generator? In Russia, for example, the generator is shared among a certain number of houses, and to connect 4 cables instead of the standard 2, we need to obtain a special permit. This adds extra control, where current limiters are installed on each wire to restrict power consumption to no more than 5 kilowatts. There are no restrictions with a single-phase connection. The thickness of the wires limits the power consumption ;D