I just started mining on a diy setup at my house. The goal of mining is to break even and get the heat byproduct out of it. It’s quite a crazy Frankenstein system but it makes sense in my head!

I have a tank with two Avalon a1566i asics. I have two more holding tanks for storage. The ASICS loop goes through a 1/25 hp circulation pump to 3/4” copper then splits into (3) 1/2” copper coils submerged into the holding tanks. The holding tank is currently at 32°c and with one ASICS running, the boards are holding steady at 71°c. With both running, they are slightly above 80°c. Wondering if upgrading to 1” and adding another submerged coil will make a significant difference.

I have a closed cooling loop connected via plate heat exchanger that will kick on a fan and radiator in my garage as well, but would like to dial in my main cooling first.

running a small setup, 40 machines at a hosting site. every time i plan upgrades or a new batch i need a guess for hashprice over the next month and what the next couple of difficulty adjustments look like

right now its a spreadsheet: the last few adjustments, a rough hashrate trend, and whatever btc price i feel like typing in lol. its usually way off, mostly because of the btc price part

how do you guys do this? do you just use the estimated next adjustment from the explorers, or does anyone model it properly? and how do you handle btc price in it, one number or a range

Friday's difficulty adjustment came in at -9.1%, the biggest cut since mid-June. BTC is near $66K, down about 13% this week, so revenue per TH is only up about 3.6% from Friday. Every number on the flyer is revenue minus power at 7.75¢/kWh.

Used Antminer S21 XP pallets, USA stock

• 270T each, 13.5 J/T, about $1.45/day profit per machine at 7.75¢/kWh

• 2-pallet deal: 40 units for $70,200 ($6.50/T), shipping extra

• More pallets available. Message us for larger orders.

• https://805mining.com/product/antminer-used-s21xp-40-units/?utm_source=reddit&utm_medium=organic&utm_campaign=flyer_20261114&utm_content=btc_bulk

Most profit per day

• Antminer S23e U2H Hydro 865T (10 J/T): about $10.28/day, $10,190

• Antminer S21e XP Hydro 860T (13 J/T): about $5.42/day, $7,880

• Bitdeer A3 Pro Hydro 660T (12.5 J/T): about $4.77/day, $10,300

• WhatsMiner M74S+ 330T (12.5 J/T, air): about $2.39/day, $5,150

Air-cooled options

• Antminer S21 XP 270T, new: $3,090

• WhatsMiner M70S 262T: $3,370

• Antminer S21 Pro+ 245T: $2,130

Used, USA stock (ships within the week, 7-day DOA)

• Antminer S21 XP 270T: $2,280 each

• Antminer S21 Pro 220–245T: from $1,170

Hosting: air-cooled at 7.75¢/kWh, metered by the kWh, in Iowa and Idaho. The SLA is 97%, and the historical average is about 99%. Setup is $50 per machine bought from us. Rewards go straight to your own pool and wallet.

Paying: 300+ cryptocurrencies, card or wire. We confirm the price after you order, because quotes move during the day.

Full list: https://805mining.com/shop/?utm_source=reddit&utm_medium=organic&utm_campaign=flyer_20261114&utm_content=btc

Revenue is from MiningNow.com at the time the flyer was made, with power at 7.75¢/kWh. It changes by the minute and isn't a guarantee of future earnings. Questions are welcome in the comments, or DM us.

The retarget lands in the next few hours (block 975,744), and mempool.space currently estimates -8.6%. That would be the biggest cut since the -10% in late May. It also comes right after two increases in a row (+5.9% and +5.5%), so a lot of people are asking what it means for their machines. Here's the short version, with this week's numbers.

How the adjustment works

• Every 2,016 blocks (about two weeks) the network resets difficulty so blocks average 10 minutes.

• When hashrate leaves, blocks slow down. Over this period they've averaged about 10 min 57 sec, so difficulty comes down to match.

• Lower difficulty doesn't change how much hashrate you have. It changes your share of each block reward.

Why it's dropping

• Price. BTC is around $68k today, below $70k for the first time since August. It's down about 8–9% on the week. Reports point to a hotter-than-expected inflation print, a stronger dollar, spot ETF outflows and over $1B in leveraged liquidations.

• Hashrate leaving. Mempool.space's estimate is down roughly 15% from a month ago. With hashprice in the low $30s per PH/day, older machines on mid-priced power are underwater, so some got switched off.

• Industry moves. Binance Pool shut down on Nov 10. It was under 1% of blocks, so it doesn't explain the drop on its own. Core Scientific is moving out of Bitcoin mining, and miners have been sending more BTC to exchanges.

What it does to your revenue

• A -8.6% difficulty change means about +9.4% more BTC per TH at the same hashrate, because 1 / 0.914 ≈ 1.094.

• But BTC also fell about 8–9% this week. In dollars per TH, most of that gain just puts you back roughly where you were a week ago.

• Rough hashprice after the cut, at today's price: about $32 per PH/day, or about 3.2¢ per TH/day. That uses mempool's estimate and assumes fees stay flat.

Break-even power cost after the cut (rough: revenue ÷ power, fees flat)

Efficiency |Example class |Break-even
12 J/TH |newest hydro / top air |~11¢/kWh
15 J/TH |S21 Pro class |~9¢/kWh
17.5 J/TH |S21 class |~7.5¢/kWh
21.5 J/TH |S19 XP class |~6¢/kWh
30 J/TH |S19j Pro class |~4.5¢/kWh The math: break-even ¢/kWh = (revenue per TH per day) ÷ (J/TH × 0.024 kWh). If you're within a cent of your line, small price moves decide whether you're making money that day.

What to actually do

1. ⁠Don't rush to turn things OFF just because bitcoins price fell. Run your own numbers with your real power cost, including fees and demand charges.

2. If you're near break-even, look at underclocking rather than shutting off. Most current firmware lets you trade some hashrate for noticeably better J/TH.

3. Expect the next adjustment to depend on price. If price recovers, hashrate tends to come back and the next retarget goes up. If it doesn't, the shake-out may continue.

4. Home and solo miners: nothing changes mechanically. Your odds per hash improve by about 9%, which is still lottery odds on a small machine.

Not financial advice. Curious where everyone's break-even sits: what power rate are you running at, and did you switch anything off this month?

What would you want to see improved in a tool like this? Are there particular features, statistics, or usability issues that matter to you?

GitHub:
https://github.com/easyblockfinder/easy-block-finder-4000

Thanks for taking a look! I'm actively working on improving it.

Heating season is here and difficulty is set to drop about 8% tonight, so here's how the two Avalon home miners compare, measured at the wall.

Avalon Q: $1,399 ($15.54/TH) 53 / 80 / 90 TH/s at 850 / 1,414 / 1,674 W (16.0 to 18.6 J/TH), 39 to 47 dB. On a regular 15 A outlet, run Eco; Standard and Super need a 20 A circuit or 240 V. Free Q exhaust shroud when you add it to your cart.

Avalon Mini 3: $789 ($21.04/TH rated) Our unit did 21.4 to 41.6 TH/s at 419 to 805 W (18.1 to 19.6 J/TH), and 31 dB in Night mode. Runs on any 120 V outlet and doubles as a baseboard heater with a thermostat.

• Ships within 1 business day! DDP shipping available for our international customers.

• For US customers, price includes all tariffs/duties

• New, from an authorized Canaan distributor, 1-year Canaan warranty

Avalon Q: https://altairtech.io/product/avalon-q/

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

Happy to answer questions below.

I’m posting this to warn other small miners using HMPool (hmpool.io).
I won their Weekly BTC Reward and completed the worker ownership verification process. Here is my timeline:Has anyone else actually received the weekly BTC reward from HMPool, or is this just a bait to attract hashpower without paying out?
Be careful before pointing your miners to this pool. I will update this post if the admin ever resolves this and sends the promised payout.

****UPDATE****

After this post, at 1pm+-, i did received from HMPOOL BTC Weekly Rewards.

i have 2 apartment buildings with 70 units each. There is a giant boiler in each building that heats them during cold months. They are currently gas powered. What are the possibilities?

Item: Canaan Avalon Q home Bitcoin miner - Houston TX

Condition: Excellent

Hashrate: 95 TH/s

Price: $700

Payment Methods Accepted: Zelle, Cash App, Bitcoin or credit card with 3.5% fee.

Shipping Information: Shipping included

Other Notes: 
About 4 months Canaan warranty left (serial / warranty check at pickup)
Local pickup in Houston or will ship in original box.

94 TH/s Super mode
Power modes: Eco ~800W / Standard ~1300W / Super ~1674W
Quiet Eco mode ~45dB
110-240V, plugs into a normal circuit
WiFi + Ethernet, Avalon app

Barely used.

I bought a 5070 2 months ago and i get electrivity at 4 cent per kwh. Can i make some money on the side or is it not worth the hastle/can reduce my gpu lifespan (planing to use this gpu for 5 yrs)

Hi all, we're building a lending protocol and trying to figure out if it fits Bitcoin miners.

The idea is a fixed-term loan against your BTC for up to 1 year, with no margin calls. You don't have to worry about the price during the term, so you can pay power and hosting now, keep your BTC, and wait until the price is better before you sell.

found an abandoned Antminer S5 and a server 1000 W PSU modded to have only 6-pin leads. connected everything to its place, reset the thing and it came up, there's a web UI and everything. added it to a solo mining pool and... I guess things are happening?

I got no illusions it's gonna spike the lottery, it's burning 500ish Watts and is a neat space heater that I turn on when it's cold outside. downlocked it to 300M so it can run with one silent fan and no issues thus far, stays within 75-85 C. was just wondering:

• I just yank it off power when I want to turn it off, no need to initiate some shutdown or sumsuch?

• on the off chance a spike does happen, where/how is that notified, the "FoundBlocks" field?

thanks for taking the time.

Wondering if it would improve airflow and reduce noise.

New to mining but noticed on multiple pools that my hash rate is almost half. Anyone have experience with this? I feel like I’m getting robbed….

I recently purchased a Canaan Avalon Q for residential Bitcoin mining and have created a Braiins Pool account.
I’m in Massachusetts, where electricity is relatively expensive, but I also have an existing 11.62 kW rooftop solar installation.
I’m considering running the miner in my basement initially, then potentially relocating it to a ventilated shed with dedicated electrical power and Ethernet.
I’m not expecting to get rich mining Bitcoin. I’m interested in learning, accumulating BTC over time, and understanding whether home mining can make economic sense with solar generation.
I’d appreciate firsthand feedback from Avalon Q owners:
What actual power consumption and hashrate are you seeing?
What are your real electricity costs and mining returns?
Have you successfully underclocked or optimized the Avalon Q for efficiency?
How are you handling heat, ventilation, and noise?
Has anyone integrated mining with excess rooftop solar production?
Would you purchase a second Avalon Q, or invest that money directly into Bitcoin instead?
What problems or unexpected costs have you encountered?
I’d especially appreciate real measurements and lessons learned rather than manufacturer specifications.
Thanks!

Has anyone seen this problem before.

After a month the machine suddenly stopped
Restarting does not work. The fans turn a notch.

Are you a Bitcoin Knots 29.4 refugee? You want to filter non-monetary transactions but stay on the sha256 version of Bitcoin?

Releasing bmf, an open-source relay filter that sits between your Bitcoin node and the internet, so you choose your own relay policy without touching consensus software.

I've also added performance optimisations to detect when new blocks have been mined, so you can start mining on the latest template sooner. The design is a non-blocking epoll loop that maintains connections to 128 peers, and it can fan out a race to find a node with the latest block.

Bitcoin Core has this horrible problem where it asserts global mutexes, slowing new block template generation. When used with bmf, Bitcoin Core only connects to bmf, resolving the blocking issue.

https://github.com/pdath/bmf

Hi everyone,

I'm looking for recommendations for a suitable coolant for my Antminer S19 Hydro.

I'm currently using Aquacomputer DP Ultra, but I suspect it might be causing issues with my circulation pump (similar to a Grundfos pump).

After the system has been shut down for a longer period, the pump rotor becomes difficult to turn manually. However, after rotating it several times, the resistance gradually disappears, and the pump starts and runs normally.

I suspect the coolant might be contributing to this issue.

My cooling loop:

• 1× Antminer S19 Hydro

• Materials: copper, brass, and aluminum

• No antifreeze protection needed

• Maximum coolant temperature: approximately 60°C

I'm looking for a coolant that:

• Is compatible with copper, brass, and aluminum

• Contains corrosion inhibitors to protect against galvanic corrosion

• Prevents bacterial and algae growth

• Is suitable for continuous operation

• Is preferably available in the EU

Has anyone experienced similar pump issues with DP Ultra? What coolant would you recommend for this setup?

Thanks in advance for any advice!

I wanted to try solo mining I didn't want to rely on a public solo pool or pay fees.

This gets what it needs from my node rather than a solopool. thought I would share just been a fun thing to mess with :)

Hi guys, im wondering if theres any firmware that can turn two of the hash boards off without producing an error, So i can mine cooler and quieter. Any recommendations would be appreciated.

BTC is near $76K, down about 2% this week, and the next difficulty adjustment (Nov 13) is estimated at about -4.3%. Margins are thin on older machines, so this week's flyer leans on efficiency. Every number on it is revenue minus power at 7.75¢/kWh.

Most profit per day

• Antminer S23e U2H Hydro 865T (10 J/T): about $11.38/day, $10,050

• Antminer S21e XP Hydro 860T (13 J/T): about $6.52/day, $7,770

• Bitdeer A3 Pro Hydro 660T (12.5 J/T): about $5.62/day, $10,160

• WhatsMiner M74S+ 330T (12.5 J/T, air): about $2.81/day, $5,080

Air-cooled options

• Antminer S21 XP 270T, new: $3,050

• WhatsMiner M70S 262T: $3,330

• Antminer S21 Pro+ 245T: $2,100

Used, USA stock (ships within the week, 7-day DOA)

• Antminer S21 XP 270T: $2,280

• Antminer S21 Pro 220–245T: from $1,170

Hosting: air-cooled at 7.75¢/kWh, metered by the kWh, in Iowa and Idaho. The SLA is 97%, and the historical average is about 99%. Setup is $50 per machine bought from us. Rewards go straight to your own pool and wallet.

Paying: 300+ cryptocurrencies, card or wire. We confirm the price after you order, because quotes move during the day.

Full list: https://805mining.com/shop/

Revenue is from MiningNow.com at the time the flyer was made, with power at 7.75¢/kWh. It changes by the minute and isn't a guarantee of future earnings. Questions are welcome in the comments, or DM us.

Not sure why. But anyway, figured I'd share this. Avalon Q In an apartment.

Hey everyone! 👋

I've deployed and opened a public **Bitcoin SOLO / Lottery Mining Pool** (CKPool running on my own full Bitcoin Core node in Europe) — zero registration, low ping, and live telemetry updating every 10s.

If anyone wants to point a Bitaxe, Antminer, or test some hashpower in solo mode, feel free to hop on:

⚡ **Live Dashboard:** https://mining.x39matrix.org

🔌 **Stratum URL:** `stratum+tcp://mining.x39matrix.org:3333`

👤 **Username / Wallet:** `YourBitcoinAddress.worker`

🔑 **Password:** `x` *(99% block reward directly to the finder, 1% pool fee)*

Currently running around **766 TH/s**. Any ping/latency feedback from EU or overseas miners is super welcome! 🍻