A Space Heater from a Bitcoin AntMiner

April 22, 2024    Bitcoin

A Space Heater from a Bitcoin AntMiner

In February, 2024, my co-worker sent me a picture of an ASIC S9 AntMiner at the local pawnshop. I couldn’t get the idea out of my head, so I started searching for resources and finally went it bought for $120 (they had it listed for $139.99, but I offered less). Suprisingly the owner did know some things about Bitcoin and had mined Ethereum in the past.

Ocean Hashrate

Joining the Ocean Pool

I decided on the Ocean pool, though it’s small after the promise of Lightning payments in the future. I did look into Braiins Pool, but just went with Ocean pool.

My Miner Info

The original ASIC dashboard. I’ve since changed this to Braiins OS to use less Watts. Firing up the S9 for the first time

My Hashrate from the Ocean dashboard Ocean Hashrate


I found a full tutorial how to turn the ASIC into a space heater . I decided it’d be a fun chance to learn about mining and to let my kids learn more about electronic hardware.

The S9 was created in 2019. So it is way out of date and it’s efficiency is no match for the s19s or the brand new s21 .

Working with my boys


The In the charts on the page for the S9 , you can see that the projected revenue does not match the electricity expenses.


  • Network Hashrate (7D) 651.05 EH/s
  • Block Rewards (24h) 6.40 BTC The halving is estimated for April 20, 2024 (today as I write this), so the Block Rewards will be 3.125 after that.

Mining Calculator


My Rewards So Far

As of 4/19/24, after running for about a month, I have 0.00028359 BTC (or 28359 SATS about $18 worth (28359 / 1554) : https://usdsat.com/) .

Ocean Rewards So far

The estimated earnings went to 7250 Sats after the Halving on April 20th.


  • $120 for the ASIC S9 Miner
  • $5 3d printed adapter by a friend
  • $32 2 Noctua NF-P14s fans
    • these reduced the sound level immensely
  • Electricty: this is very rough but about $2.80 W per hour to 19.2 KWH per day * .15 per KWH = $2.88
    • $2.88 per day X 30 = $86.44

3d printed adapter

At current prices, I spent about $243.40 and am waiting to gain $18 worth of Sats.

Update on 5/21/2024

  • I used 547 extra Watts in April, it was about $2 more per day on average
  • after almost 2 whole months, I’ve made 49,683 SATS for around $170 in electricty.
  • It’s getting warm out, so it’s time to shut it off. I don’t need extra heat.
  • I need to setup Bolt12 Lightning so that I can get my payment.
  • I’m happy with the experiment and will consider bringing it back online when it’s cold out again.

I knew I wouldn’t make money, but at least my basement is a bit warmer :-)


The Avalon Nano 3 is only $99 (as of 4/24/2024). I think more and more options will come out as time goes on.

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