Still paying for heating?

Save up to € 3,800 every year with bitcoin heating. Calculate your heating costs.

Buy now
Free shipping
30-day-return
Made in Austria

Get a Bitcoin Heater

Ofen

800 W
Power
32 m²
Area heated
35 dB
Noise level
€ 0.075 / kWh*
Bitcoin reward
52 × 35 cm
Size
up to 10 TH/s
Mining power

€990,00

incl. VAT & shipping
Buy now
21energy Ofen Rendering

Ofen Pro

Bestseller
1,100 W
Power
44 m²
Area heated
35 dB
Noise level
€ 0.28 / kWh*
Bitcoin reward
58 × 38 cm
Size
up to 40 TH/s
Mining power

€3.470,00

incl. VAT & shipping
Buy now
Free shipping
30-day-return
Made in Austria
*As at 08.2024 - 4-year average

How does it work?

Easy peasy. This is how you get up to 100% and more cashback and save our planet.

Ofen Explanation - Heating and getting Bitcoin Rewards

Step 1

Plugin your heater.

Step 2

Connect it to your wallet.

Ready!

Heat your apartment and earn bitcoin at the same time.
Buy now
Free shipping
30-day-return
Made in Austria
Ofen Explanation - Heating and getting Bitcoin Rewards

Heat smart. Earn more.

Heating area

Heat spaces up to 44 m² with a single device

Cashback

Cashback of up to € 0.28 / kWh

Whisper quiet

Whisper quiet 35 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 40 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
21energy Ofen Explosion Rendering
Buy now
Free shipping
30-day-return
Made in Austria

Calculate your annual heating savings

Select product:
Ofen Pro
Ofen
Country
Electr. costs (/kWh)
-
0.26
+
Area heated
80
Variable electricity price
By using a variable electricity provider on the spot market in combination with the 21energy app, you can reduce your electricity costs by up to 50%.
PV system
In summer, it is possible to monetize surplus electricity from a PV system, if one is available. The value is a rough estimate based on conventional data.
Heat pump
Heat pump
- € 1.400
/ Year
Gas & Oil
Gas & Oil
- € 2,800
/ Year
Electric
Electric
- € 4,160
/ Year
Bitcoin heater
Bitcoin heater
- € 4,160
/ Year
+ € 4,580
/ Year
Average heating cost savings per year. *
€ 4,372
Additional profit through surplus electricity monetization:
0 + 0 = € 0
save up to 3 tons of CO₂ / year
Calculate in detail
* The heating cost savings were determined by comparing them with the average heating costs of all heating systems.

Save up to € 3,800 every year with bitcoin heating.

Get Ofen Pro
Free shipping
30-day-return
Made in Austria
Ofen Pro
Ofen Pro
Ofen Pro
Get Bitcoin Reward up to
€ 0.28 / kWh
Get Ofen Pro
Free shipping
30-day-return
Made in Austria

What customers say

Andreas Streb

"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."

Andreas Streb
@ VR Bayern Mitte
Niko Jilch

"I heat my office with a heater from 21energy. This is how I secure the most important money network of all time and stay warm in winter. A brilliant idea!"

Niko Jilch
@ Was Bitcoin bringt.
Nano Grijalba

"With 21energy's Ofen you're not just heating your home, you also earn money at the same time. Who would have thought that staying warm could be so cool."

Nano Grijalba
@ Braiins
Marcus Izmir

"A great idea and a very exciting option for anyone who wants to keep a room warm - especially if the energy for this comes from your own PV system, for example."

Marcus Izmir
@ Crypto Investment Circle
Crypto Robby

"Heating my space while earning Bitcoin has been a game changer. Truly a unique find that's added warmth and a bit of excitement to my daily routine."

Robby Schwertner
@ CryptoRobby
Baby touching a 21energy Ofen21energy Ofen Pro in a living room

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Good for the environment

The operation of the Ofen can save up to 3 tons of CO₂ per year compared to conventional heaters, which underlines the environmentally friendly nature of the appliance. In addition, the Heater is CE-compliant and meets the highest safety standards.

save up to 3 tons of CO₂ / year

Why get any other device?

Ofen
Ofen
Dyson
Dyson HP07
Oil heating
Oil heating
Gas heating
Gas heating
Heat pump
Heat pump
Acquisition & installation costs
from € 990,00
€ 849,00
€ 17.000,00
€ 15.000,00
€ 15.000,00
Avg. area heated
up to 44 m²
40 m²
120 m²
120 m²
120 m²
Operating costs (Winter)
€ 4.160,00
€ 4.160,00
€ 2.915,00
€ 2.800,00
€ 1.040,00
Income (Winter single-family house)
up to € 4.620,00
€ 0,00
€ 0,00
€ 0,00
€ 0,00
Heating profit
from € 330,00
€ -4.160,00
€ -2.915,00
€ -2.800,00
€ 0,00
Calculations per second
up to 40 TH/s
0
0
0
0
CO₂ emissions in kilograms
as low as 0
880
7720
4940
as low as 0
Sustainability
Excellent
Moderate
Bad
Bad
Excellent
21energy App Mockup

Set up in 3 minutes using the app.

Download the app on the App Store Download the app on Google Play

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.

21energy App Feature Variable Electricity Price
Coming soon
Feature 1

Variable electricity price

Use your Bitcoin heater more efficiently than ever before! Automate use when electricity prices are low and save money - smarter heating has never been so easy.

21energy App Feature Home Assistant Integration
Coming soon
Feature 2

Home Assistant Integration

Perfectly connected: control your Bitcoin Heater directly via your smart home. Seamless integration for maximum convenience and full control.

21energy App Feature Bluetooth Thermostat
Coming soon
Feature 3

Bluetooth Thermostat

Precise temperature, optimum performance: With the Bluetooth sensor, your Bitcoin heater adapts flexibly to your home - for even greater efficiency.

Dive into the specifics

Discover our innovative Bitcoin heaters and find out how it helps you to heat more efficiently and save money.

Questions & Answers

Shipping

When will my products be delivered?

We typically ship all products within 2-3 business days. Following that, your order will reach you within a few business days, depending on the delivery location. Any pre-orders or delays will be indicated in the description or in a separate message.

In which countries does 21energy ship to?

Currently, we ship to the EU, Switzerland, Norway, Great Britain, US & Canada. If you want to find out if we deliver to your address, you can easily test this in the checkout process by entering your address there.

What are the shipping costs for me?

The shipping costs vary depending on the delivery location. To calculate your personal shipping costs, you can go through the checkout process. After entering the delivery address, the costs will be displayed to you.
All orders over 200€ qualify for free shipping!

Are there any additional costs for customs or taxes?

For all customers within the EU, there are no additional costs due to taxes and customs. All customers outside the EU pay only the net price in the store when ordering. Therefore, taxes and duties will be incurred upon import and are to be paid there.

Can I cancel my order?

Yes, every customer has a 30-day right of withdrawal. Within this period, you can cancel your order without providing any reasons. The paid amount will be refunded to you via the originally selected payment method.

Income

How do the 21energy heaters and computers (mining devices) make money?

21energy heaters and computers (mining devices) generate revenue through the process of Bitcoin mining, wherein specialized hardware solves cryptographic puzzles to validate and secure transactions on the blockchain network. As a reward for their computational work, miners receive newly minted bitcoins and transaction fees.

How much can I earn from heating with the heaters or other mining devices?

Your mining earnings depend on various factors such as the price of Bitcoin, market rates for computations, global hashing power, duration of operation, and hardware model. For your individual situation, we have developed a profitability calculator. The significant distinction from any other electric heater is that cash flow is generated while heating.

Performance

Do the different products require more electricity than traditional heaters?

No, these products do not require more electricity than traditional heaters. They efficiently convert 100% of the electrical energy into heat, simultaneously utilizing it to mine Bitcoin, effectively leveraging energy in a dual capacity.

Does my electricity bill change with 21energy products?

If the same heating method (electric heating) with the same heat demand is applied as before, the electricity bill usually does not change, as the entire electrical energy continues to be converted into heat.

Can the heating power be adjusted on the individual devices?

The heating power can usually be adjusted continuously within a specific range on all of our devices.

How much heating area do 21energy products cover?

The heating area of each heater is specified in the product descriptions, which may vary significantly depending on their characteristics. For all individual hardware devices, the heating area can be determined using various calculators available online, based on the specified power output.

Are the products allowed to be overclocked to achieve maximum yield?

Our heaters are only allowed to be operated at the maximum power specified in the description and/or user manual. Overclocking poses a high risk and will void the warranty immediately. Similarly, each individual Bitcoin mining device should only be operated at its maximum standard power.

Safety & Warranty

Are the devices designed for maximum safety and CE compliant?

All products sold have been tested according to the highest and latest safety standards and are CE compliant.

Are safety mechanisms installed in the various devices to prevent overheating?

All our heaters are equipped with a special operating system designed to prevent overheating by shutting down the device beforehand.

Can 21energy products be operated around children?

Yes, our products are designed for use in residential spaces like traditional homes. They are conventional electrical appliances. Therefore, the usual precautions for children apply.

Is there a warranty on 21energy heaters and other products?

Provided that the safety precautions outlined in the user manual are followed, our heaters come with a 12-month warranty. This also applies to all of our newly and originally packaged Bitcoin miners.

Business

I would like to partner with you. What options are available? Is it possible to collaborate with 21energy as a distribution partner?

Please feel free to submit an inquiry through our contact form on the website. Please provide all necessary information so that we can process your request as efficiently as possible.

Are there special pricing tiers for larger quantities?

Yes, we have specific pricing tiers for certain products starting from a certain quantity. Please feel free to send us an inquiry through our contact form for more information.

Is it possible to invest in 21energy?

Please feel free to email us at office@21energy.com and we will get back to you.

Are there any open positions at 21energy currently?

Please have a look at our open positions.

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