Can you heat your house with a Bitcoin miner?

Yes. An ASIC miner converts almost 100% of its electricity into heat, so it works exactly like an electric heater — a 1,000 W miner produces about 1,000 W of heat — while also earning cryptocurrency. Purpose-built 'Bitcoin heaters' like the 21energy Ofen are designed to do this quietly in a living space.

Is a Bitcoin heater worth it?

If you already heat with electricity, yes — you get the same warmth plus mined coins, so your effective heating cost drops. A 21energy Ofen 2 mines roughly $1.40/day at mid-2026 prices, offsetting part of its electricity. The upfront cost is much higher than a normal heater and it mainly earns during the heating season, so it suits cold-climate homes.

How much heat does an ASIC miner produce?

Almost all of its power draw becomes heat. A 1,000 W miner outputs about 1,000 W of heat (enough for a ~50 m² room); a 3,000 W miner outputs about 3,000 W. That's the same heat as an equivalent electric heater.

What is the 21energy heater?

21energy is an Austrian company that makes Bitcoin heaters — space heaters that mine Bitcoin. The Ofen 2 outputs up to 1,000 W of heat, runs at about 42 TH/s, and is whisper-quiet (under 35 dB on its low setting), so it can sit in a living room unlike a standard Antminer.

Are mining heaters noisy?

Purpose-built ones are quiet. The 21energy Ofen 2 runs under 35 dB on low and around 45 dB on high — quieter than a fridge. That's the whole point: standard miners are 70+ dB and unusable indoors, while heat-miners are engineered for living spaces.

Do mining heaters work in summer?

They still mine in summer, but you don't want the heat — so most people run them only during the heating season and either switch to a hosted miner or pause for the warm months. That seasonality is the main limitation of a mining heater versus a year-round hosted rig.

Bitcoin Heater 2026: Mine Crypto & Heat Your Home

Here's a fact that changes how you think about mining: an ASIC miner converts very nearly 100% of the electricity it draws into heat. A 1,000-watt miner is, physically, a 1,000-watt electric heater — one that happens to earn cryptocurrency while it warms the room. A new category of "Bitcoin heaters" is built around exactly this idea, and in cold, high-electricity-price Europe it's one of the few ways mining at home genuinely adds up.

How a Bitcoin heater works

Electric resistance heaters turn power into heat at ~100% efficiency. So does a miner — the chips do useful computation first, then shed that energy as heat. If you were going to run an electric heater anyway, swapping it for a mining heater gives you the same warmth plus a stream of crypto on top. You still pay for the electricity, but part of it comes back as mined coins, so your effective heating cost drops.

21energy: Bitcoin heaters made in Austria

The clearest example is 21energy's Ofen series ("Ofen" is German for furnace). These are purpose-built Bitcoin heaters designed to look and behave like a premium space heater, not a screaming data-centre box:

Model	Heat output	Heats up to	Hashrate	Noise	Price
Ofen 2	up to 1,000 W	~50 m²	~42 TH/s	<35–45 dB	$1,770
Ofen 2 Pro	up to 1,100 W	~55 m²	up to ~60 TH/s	quiet	$2,240

The key number is the noise: under 35 dB on the low setting is quieter than most fridges, which is what makes these usable in a living room or office where a normal Antminer (70+ dB) never could be.

VolcMiner: the low-noise "radiateur"

If you'd rather mine Litecoin and Dogecoin while you heat, the VolcMiner D1 Pro and D3 are Scrypt miners built with home use and low noise in mind — searched for in French as "volcminer radiateur" (radiator). They put out serious heat (3,000W+ class) and earn LTC + DOGE together, making them a powerful workshop or garage heater that pays you back.

The maths: does a Bitcoin heater pay?

Take the Ofen 2 at ~42 TH/s and 1,000 W. Running 24/7 it uses about 24 kWh/day. At a typical European residential rate of €0.30/kWh that's ~€7.20/day of electricity — the same as any 1 kW heater. At mid-2026 Bitcoin hashprice (~$0.033/TH/day) it mines roughly $1.40/day, offsetting around 20% of that energy cost. So you heat your home for ~€6/day instead of €7.20, and the colder/longer you run it, the more BTC you stack. Where power is cheaper, the offset is proportionally bigger — and a mining heater is always strictly better than a dumb electric heater, because you get identical heat plus coins. (Figures are estimates; BTC price and hashprice move daily.)

Pros, cons and who it's for

The honest trade-offs: a Bitcoin heater costs far more upfront than a €40 electric heater, it only earns its keep during the heating season, and it's electric heat (more expensive per kWh than a heat pump or gas). But for a cold-climate home or workshop that already uses electric heating, it turns a pure cost into a partly-earning asset — quietly, in a living space, which ordinary miners can't do. It shines for Bitcoiners in Northern and Central Europe who want to mine without the noise, heat dump and bill of a conventional rig.

Want to mine year-round, not just in winter?

Heaters are perfect for the cold months. For the rest of the year, host a standard high-efficiency miner with us from $0.018/kWh and keep earning all summer.

Explore hosting →

See the heat-miners and the wider range on the miners page, or read our Litecoin & Dogecoin miner guide for the Scrypt options.

Bitcoin Heater 2026: Mine Crypto and Heat Your Home