How a heater miner works
The short version: a Bitcoin miner is a space heater that also does mining work. Here's what that means for your room and your power bill.
1. Electricity in, heat out
A mining chip does billions of calculations a second, and nearly every watt it uses ends up as heat, just like an electric space heater. So a 1,000 W miner warms a room about as much as a 1,000 W heater.
A heater miner puts that chip in a quiet, room-friendly case with a fan, a thermostat or app, and heater-style modes. You run it when you want heat, and it mines while it does.
| Miner | Stated power | Heat (BTU/h) |
|---|---|---|
| Avalon Nano 3S | ≈140 W | ≈478 |
| Avalon Mini 3 | ≈800 W | ≈2,730 |
| Heatbit Maxi | ≈1,500 W | ≈5,118 |
Heat = stated watts × 3.412, at full power.
2. Where the money comes from
While it heats, the miner can earn bitcoin. There are two ways to run it:
- Pool mining: you join thousands of other miners. The pool finds blocks often and pays you a small share for your work, minus a pool fee. You get small, steady payouts that knock part of the power bill back down.
- Solo mining: you try to find a whole block on your own. If you do, you get the full reward (about 3.125 BTC plus fees), but for one home miner that's a long-shot lottery, and most of the time you get nothing.
Most heater-miner owners pool. Solo vs pool, explained.
3. What it won't do
- It won't usually cover your whole power bill. Pool earnings rise and fall with Bitcoin's price and the network's total hashrate. Your electricity rate decides how much they offset. We don't show earnings promises.
- It's not the cheapest heat. A heat pump can move several units of heat for each unit of electricity, so it heats for less than any electric heater, miners included. Heater miners make the most sense in place of a plain electric heater.
- It's not free in summer. If you don't need the heat, you're paying for power just to mine.
4. Before you buy
- Size: about 300–800 W suits a small or medium room. 1,500 W-class units are like a full-size space heater on high.
- Circuit: a US 15 A, 120 V circuit should carry about 1,440 W continuously. Put big units on their own circuit, and follow the maker's guidance.
- Noise: fans are louder in high-heat modes. Check the stated decibels.
- Stock: many heater miners sell out before winter, and pre-orders ship later. Check the badge on each listing.