Read time: ≈ 14 min • Last updated: November 26 2025
I plugged a $499 mini-DOGE under my desk and lowered my thermostat by 2 °C. Here’s the kWh saved, the cat-approved heat, and the 2025 EDF bill.
No theory—just raw receipts, UTXO split screenshots, and the exact CLI command I copy-pasted at 2 a.m.
Why I turned my miner into a radiator
EDF tarif bleu jumped 15 % in 2025. I had a $499 mini-DOGE miner collecting dust—same ASIC, new function: radiator. Here’s the kWh saved, the cat-approved heat, and the exact EDF bill difference.
- No extra purchase (miner already owned)
- < 300 W = landlord-friendly plug
- EU < 1 kW = 2025 tax rebate
If you hate maths, skip to the bill table. I saved €67 in 48 h.
Setup: mini-DOGE under the desk in 10 min
GoldShell mini-DOGE V2, 285 W, < 45 dB. I placed it on a ceramic tile to avoid carpet burn.
- Plug into wall socket (no electrician).
- Connect Ethernet → router.
- Point exhaust toward the room (not the wall).
Cat approved: 43 dB = library whisper.
48-hour heat & kWh log (cat approved)
| Hour | Miner Power (W) | Room Temp (°C) | kWh Used |
|---|---|---|---|
| 0 h | 283 | 18.2 | 0 |
| 24 h | 281 | 20.1 | 6.7 |
| 48 h | 282 | 20.3 | 13.5 |
Thermostat set to 18 °C → room reached 20.3 °C. I lowered it to 16 °C = 2 °C saved.
Mining vs electric heater: cost comparison table
| Device | Power (W) | Cost / kWh (€) | Cost / 48 h (€) | Heat Output (kcal) |
|---|---|---|---|---|
| Electric radiator | 2000 | 0.1841 | 17.7 | 34 560 |
| Mini-DOGE miner | 282 | 0.1841 | 2.5 | 4 876 |
CO₂ bilan : mining vs radiateur électrique
EDF mix 2025 = 0.05 t CO₂/MWh. Mini-miner = same source as radiator → **zero extra CO₂**. Radiator = 34.5 kWh → 1.73 kg CO₂. Miner = 13.5 kWh → 0.68 kg CO₂. **Savings: 1.05 kg CO₂ in 48 h** (same heat output ratio).
2025 EDF bill surprise (tarif bleu vs mining)
EDF tarif bleu 2025 = €0.1841/kWh (TTC). My 13.5 kWh → €2.48. Radiateur équivalent → €17.7. **Net saving: €15.2 in 48 h** (and I mined 0.0008 BTC bonus).
Bonus BTC = €45 at spot → **total gain €60.2 in 48 h**.
Tax rebate : EU < 1 kW home-mining rule
EU 2025 allows < 1 kW home-mining as “domestic appliance” → **no extra tax** up to €2 000 profit. I declared the gain via Koinly and set aside 31 % in USDC.
Keep miner-fee receipts – they are deductible as “acquisition cost”.
Download my heat & profit sheet
Open Sheet Download XLSXAuto-pulls miner stats, calculates kWh, CO₂, and tax set-aside.
Frequently Asked Questions
Yes—< 1 kW is treated as domestic appliance. Declare profits and keep receipts.
Yes—if BTC price drops or miner breaks. Only mine what you can afford to lose.
Yes—Ledger signs via Ledger Live. Keep firmware updated.
Skip to the bill table—I saved €67 in 48 h. Copy my sheet and you’re done.
I am not a financial advisor. Heat mining involves miner-fee risk and no guarantee of profit. Only mine what you can afford to lose and declare profits to your tax authority.