Warmth that pays
Warmth that pays Earn bitcoin for every hour your room stays warm. Up to 42 TH/s.
Ofen 2
Price range: $1.816,00 through $2.387,00
| Weight | 24 kg |
|---|---|
| Dimensions | 90 × 32 × 14 cm |
| Power: | 1,000 W |
| Area heated: | up to 50 m² |
| Noise level: | 32 dB |
| Mining power: | 32 TH/s – 42 TH/s ± 10% |
| Bitcoin reward: | € 0.08 – 0.10 / kWh |
| Model | 35 TH, 42 TH |
Free shipping • 30-day-return • Made in Austria
We accept
The 21energy Ofen 2 is perfect for you, if you want to heat your home and earn Bitcoin at the same time. Imagine having a heater that not only keeps your home warm, but also provides you with additional income. The Ofen 2 offers a heat output of up to 1,000 watts and can heat rooms up to 50 m². It runs whisper-quiet — under 32 dB on the lowest setting, 35 dB on the medium setting, and 42 dB on the highest setting.
The Ofen 2 from 21energy offers a heat output of up to 1,000 watts and enables uncomplicated plug & play commissioning for particularly easy handling. This combination of performance and user-friendliness enables effortless use and optimum heat supply. Simple connection via WLAN and initial configuration takes just a few minutes. With the supplied operating instructions and a video tutorial, installation is very easy and child’s play even for non-technical users.
Thanks to the innovative combination of convection and radiation, the heater provides even heat distribution. Even at it’s high output, the Ofen 2 remains extremely quiet and ensures quiet operation with less than 42 dB at 1,000 watts, creating a pleasant room climate.
The Ofen 2 made of premium materials & powder‑coated steel not only gives the heater an aesthetic appearance, but also ensures robustness and durability. With a mining power of up to 42 TH/s and an efficiency of up to 20 J/TH, the Ofen 2 offers impressive performance.
The air and dust filters of the Ofen 2 provide effective protection against dirt deposits in the appliance, protecting the internal hardware and extending the life of the heater. The galvanized sheet metal provides durability and corrosion resistance, ensuring reliable use of the heater in a wide range of conditions.
The built-in Bitcoin miner is compatible with various mining pools and can also be used for solo mining.
The savings potential of the Ofen 2 depends on individual energy costs and Bitcoin mining profitability.
In the box
Ofen 2
1.000 W
Power cord
1 m
Manual
Quickstart guide
Designed for the way you live
Automation
Termostat & time schedules that maximize comfort and BTC yield.
Sleek and elegant
Premium materials & powder‑coated aluminium.
Why choose Ofen 2
More warmth, more bitcoin, & zero compromise.
Ofen 2
1,000 W
Power*50 m²
Area heated32 dB
Noise levelup to 35 TH/s
Mining power*€ 0.08 / kWh
Bitcoin reward
(1-year average)**€ 0.18 / kWh
Bitcoin reward
(4-year average)**90 x 32 x 14 cm
Size24 kg
Weight
* ± 10%
** As at 06.2025
Price range: $1.816,00 through $2.387,00
incl. VAT & shipping
How does it work?
Easy peasy. This is how you get up to 100% and more cashback and save our planet.
Step 1
Plugin your heater.
Step 2
Connect it to your wallet.
Ready!
Heat your apartment and earn bitcoin at the same time.
Free shipping • 30-day-return • Made in Austria
Heat smart. Earn more.
Heating area
Heat spaces up to 50 m² with a single device
Cashback
Cashback of up to € 0.22 / kWh**
Whisper quiet
Whisper quiet 32 dB (as silent as a fridge)
Sustainable
Save up to 3× as much CO₂ as an electric car
Thermostat (coming soon)
Temperature control for optimal comfort and energy savings
Mining power
Up to 42 TH/s hashrate for efficient Bitcoin mining*
App
User-friendly app for monitoring and controlling your heating from anywhere
Variable electricity costs
Optimize energy use and reduce costs by heating during off-peak times
Save up to 7 tons of CO₂ / year
The heating cost savings were determined by comparing them with the average heating costs of all heating systems.
What customers say
“I wouldn’t have thought that mining in Germany would be so easy. I now have a warm garage and the profitability of my PV system has also improved.”
@ VR Bayern Mitte
Set up in 3 minutes using the app.
See our new features
Good news: Already purchased devices are fully compatible - the new features are conveniently added to your smartphone via a software update.
