Halving is coming!

It's Halving Week! Enjoy discounts of up to 32% on our products to celebrate this monumental event in the bitcoin world. Hurry, this offer ends on Sunday!

Bitcoin Halving Event Bitcoin Halving Event

Our halving sales


Bitcoin Heater

Ofen Pro

Bitcoin Heater


Industrial Heater

Bitmain Antminer S9

Bitcoin Miner

S9 Silent

Bitcoin Miner

Bitmain Antminer S19k Pro

Bitcoin Miner

How does it work?

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

We put a bitcoin miner in a soundproof heater casing.


You start the heater and connect it to your wallet.


You heat your apartment and earn bitcoin at the same time.

Calculate your savings potential
Known from

Earn money with heating your home

Heat spaces up to 480 ft² with a single device

Cashback of €0.28 / kWh

Whisper quiet 40 dB (as silent as a fridge)

Save 3x as much CO₂ as an electric car

Dyson HP07
Oil heating
Gas heating
Acquisition costs
from € 990,00
€ 849,00
€ 14.000,00
€ 12.000,00
Installation costs
€ 0,00
€ 0,00
€ 3.000,00
€ 3.000,00
Maintenance effort
Avg. area heated
up to 44 m2
40 m2
120 m2
120 m2
Operating costs (Winter)
€ 4.160,00
€ 4.160,00
€ 2.915,00
€ 2.800,00
Income (Winter single-family house)
up to € 4.613,00
€ 0,00
€ 0,00
€ 0,00
Heating profit
from € 453,00
€ -4.160,00
€ -2.915,00
€ -2.800,00
Calculations per second
up to 40 TH/s
Income per kWh
up to € 0,288
€ 0,00
€ 0,00
€ 0,00
CO2 emissions in kilograms
as low as 0
Two-dimensional energy use

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."

Andreas Streb
@ VR Bayern Mitte

"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

"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

"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

"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."


Profitability calculator

From whisper-quiet heating systems for your living room to large-scale business solutions. Find out whether the innovative Bitcoin heating system is also worthwhile for you.

Calculate profitability

Dive into the specifics

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

The Bitcoin Heater from Tyrol - Visit to 21energy

This saves much more oil than a Tesla

The Bitcoin Heater for Home and for Construction

Energy Transition through Bitcoin Mining

Questions & Answers


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. Shipping to the USA will also be launched in the next coming weeks. 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.


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.


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.


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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