21ENERGY — Sustainable Heating Solutions. powered by Bitcoin.
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Mine earn heat visualization

Cash flow heaters?

Plug in, heat sustainably, hash and make money*! This is the future of heating with heaters from 21ENERGY. In addition to waste heat, these produce a permanent cash flow by calculating 10 to 120 trillion computing operations per second using high-performance computers. In this way, you reduce your heating costs*, save tons of CO2, stabilise the electricity grid and at the same time ensure the sensible use of surplus renewable electricity.

From whisper-quiet heating systems for your living room to large-scale business solutions for commercial and industrial applications, we have the perfect heating solution for your needs.

Our new product: Heater S19

Heating powerup to 3,000 watts
Calculationsup to 120 TH/s
Silent Heatingas low as 45 dB
CO2 savingsup to 10.8 tons / year
Shipping from09/2023

€ 9.110 / year Cashflow (48- months moving average)

Up to 120 trillion calculations per second

Highest efficiency thanks to latest hardware generation

Silent Heating: best suited for the living room

Known from

Austrian Blockchain Award 2023

Only four months after our founding, 21ENERGY was already nominated as the best Austrian Blockchain Start-Up 2023.

Computing Heater X9

Heating power2.000 watts
Calculationsup to 24 TH/s
Noise level55 dB
CO2- savingsup to 7,2 tons / year
Amortization periodas low as 7 months
Sizeapprox. 100 x 65 x 40 cm | ~50 kg
Availablefrom 07/2023

The new construction container standard

€ 1.820 / year Cashflow (48- months moving average)

Up to 24 trillion calculations per second

High heating cost savings potential

Scalable – large construction sites and construction corporations

Fully automatic payout to your bank account?

Sell the heated Bitcoins fully automatically and get the proceeds automatically transferred to your bank account every month in euros? Yes! Atour partner Coinfinity 21ENERGY customers can set up a Bitcoin withdrawal savings plan.

You can also use Bitcoin heaters to simply heat more cheaply, even if you are not (yet) a convinced Bitcoiner.
So companies can also use Bitcoin as a technology to heat more cheaply, without having to take Bitcoin onto the balancesheet straight away.

To activate the Bitcoin Withdrawal Savings Plan at  Coinfinity send us a short email to entnahmesparplan@21energy.io.

Bitcoin Heater S9x

Heating powerup to 2.500 watts
Calculationsup to 30 TH/s
Whisper quiet<40 dB
CO2- savingsup to 9 tons / year
Shippingwithin 2 business days

€ 2.280 / year Cashflow (48- months moving average)

Up to 30 trillion calculations per second

High heating cost savings potential

Whisper quiet and best suited for the living room

Was Bitcoin bringt Logo

"Was Bitcoin bringt." - German Podcast

„Was Bitcoin bringt.“ wants to make Bitcoin understandable – in words, sound and pictures. The project is the initiative of financial journalist Niko Jilch. The goal: to strengthen and network the German-speaking Bitcoin community – and to bring the Bitcoin phenomenon closer to as broad a mass as possible. Our Co-Founder and CEO Maximilian Obwexer joined him on the podcast to talk about why heating with Bitcoin is sustainable.

"Das spart viel mehr Öl als ein Tesla" - Max Obwexer

BTC Prague

From 08 – 10 June, we were an exhibitor at BTC Prague, the largest Bitcoin conference in Europe. In addition to our Bitcoin Heater S9x we also exhibited the Computing Heater X9 at our first international show and received great feedback. You can find more dates to get to know us and our products live here.

Die Bitcoin Heizung für daheim und für den Bau - 21ENERGY Interview auf der Prag Konferenz

Blocktrainer Beach 2023

On Sunday, 23.07.2023, the Blocktrainer Beach Event took place in Oberhausen. At Germany’s biggest Bitcoin summer festival, there was again the opportunity to admire our Bitcoin Heater or to buy Bitmain Antminer S9. As a small highlight, our co-founder Lukas Waldner was on stage as a speaker. Don’t miss the chance to get to know us and our products better at other live events. You can find all dates here.

Energiewende durch BITCOIN Mining!⚡Panel vom Blocktrainer Beach 2023

experience 21ENERGY live

Berlin BItcoin Space
Berlin Bitcoin Space (Best of Blockchain)
5. – 7. October 2023 | STATION Berlin

21ENERGY for networking


Arroganz, Dekadenz, Inkompetenz: Europa am Abgrund - Marc Friedrich
Bitcoin - Fluch oder Segen? Im Gespräch mit Marc @BITCOIN-HOTEL

How it all began

Heizen mit Bitcoin Mining... in Europa? Ist das möglich?!?

Peter Kotauczek about 21ENERGY

Die 12 Stufen der Bitcoin-Adoption - Peter Kotauczek

Partner & Cooperations

is a platform focused on bitcoin education and energy consulting. A very special focus is on Bitcoin mining in combination with renewable energy and heat recovery. Through daily contact and constant consultations with companies, they are very good at assessing the demand for special products in the industry. We use these synergies together to develop innovative heating systems with high-performance computers.

21ENERGY and MIM use synergies in the purchase of hardware on the world market to offer better conditions to the customers of both companies.

is a fellow Tyrolean Bitcoin company where you can purchase 21ENERGY Merchandise and much more.

The Bitcoin Channel with Niko Jilch. He is a financial journalist, speaker and moderator. He has been studying our monetary and financial system, inflation, central banks, gold and, of course, Bitcoin for more than ten years.

The new heating standard

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At present, we supply our products to all EU countries, Switzerland and Norway. (except Malta & Cyprus)

The savings potential varies depending on the given energy prices. If applicable, the cost savings can be very high. With our profitability calculator you can calculate your individual heating cost savings. https://21energy.io/en/profitability-calculator/

All our products are very robustly built so that they last for many years.
Should a device still become defective in the first year, we will of course replace it and are also available for very favorable replacement parts at any time after one year.

Yes! The products are classic electrical devices. Thus, the usual precautions apply. All our products sold are CE compliant.

You can find detailed information about the individual products directly in the product descriptions, as well as in the respective operating instructions.

The Bitcoin Heaters may be operated with a maximum power of 2.0 2.5 or 3.0 kW as specified for the respective product.

Overclocking miners will void the warranty with immediate effect.

From 10 pieces we make you an individual offer. Please send us an e-mail to office@21energy.io.


Maximilian Obwexer, 21ENERGY Co-Founder & CEO

Maximilian Obwexer

Co-Founder & CEO
Lukas Waldner, 21ENERGY Co-Founder

Lukas Waldner


Bitcoin Heaters

  • incl. VAT

    Bitcoin Heater S19

    4.970,00  (incl. VAT plus shipping costs)
  • incl. VAT

    Bitcoin Heater S9x

    1.490,00 2.470,00  (incl. VAT plus shipping costs)
  • incl. VAT

    Computing Heater X9

    1.497,00  (incl. VAT plus shipping costs)
  • incl. VAT

    S19 Silent

    3.470,00  (incl. VAT plus shipping costs)
  • incl. 20% VAT

    S9 Silent

    390,00  (incl. VAT plus shipping costs)

Bitcoin Mining Equipment​

  • incl. VAT

    S19 Silent Kit

    249,00 449,00  (incl. VAT plus shipping costs)
  • incl. VAT

    S19 Silent

    3.470,00  (incl. VAT plus shipping costs)
  • incl. VAT

    Bitmain Antminer S19

    2.280,00 2.760,00  (incl. VAT plus shipping costs)
  • incl. 20% VAT

    S9 Silent

    390,00  (incl. VAT plus shipping costs)
  • incl. 20% VAT

    Bitmain Antminer S9

    160,00  (incl. VAT plus shipping costs)
  • incl. 20% VAT

    Bitmain APW3++

    60,00  (incl. VAT plus shipping costs)
  • incl. 20% VAT

    S9 Silent Kit

    50,00  (incl. VAT plus shipping costs)


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