Skip to content
Trustpilot
  • English
  • Deutsch
  • Français
  • Norsk
  • Svenska
  • Suomi
  • Albania (EUR €)
  • Andorra (EUR €)
  • Austria (EUR €)
  • Belgium (EUR €)
  • Bosnia & Herzegovina (EUR €)
  • Bulgaria (EUR €)
  • Croatia (EUR €)
  • Cyprus (EUR €)
  • Czechia (EUR €)
  • Denmark (EUR €)
  • Estonia (EUR €)
  • Finland (EUR €)
  • France (EUR €)
  • Germany (EUR €)
  • Greece (EUR €)
  • Hungary (EUR €)
  • Iceland (EUR €)
  • Ireland (EUR €)
  • Italy (EUR €)
  • Latvia (EUR €)
  • Liechtenstein (EUR €)
  • Lithuania (EUR €)
  • Luxembourg (EUR €)
  • Malta (EUR €)
  • Monaco (EUR €)
  • Montenegro (EUR €)
  • Netherlands (EUR €)
  • Norway (EUR €)
  • Poland (EUR €)
  • Portugal (EUR €)
  • Romania (EUR €)
  • Serbia (EUR €)
  • Slovakia (EUR €)
  • Slovenia (EUR €)
  • Spain (EUR €)
  • Sweden (EUR €)
  • Switzerland (EUR €)
  • Ukraine (EUR €)
  • United Kingdom (EUR €)
  • Heaters
    • Home Heaters
    • Industrial Heaters
    • Heater Accessories
  • For Bitcoiners
    • Bitcoin Heater
    • Bitcoin Miner
    • Solo Miner
    • Miner Controller
    • Mining Equipment
    • Services
  • Support
  • About us
  • Business Solutions
  • English
  • Deutsch
  • Français
  • Norsk
  • Svenska
  • Suomi
  • Albania (EUR €)
  • Andorra (EUR €)
  • Austria (EUR €)
  • Belgium (EUR €)
  • Bosnia & Herzegovina (EUR €)
  • Bulgaria (EUR €)
  • Croatia (EUR €)
  • Cyprus (EUR €)
  • Czechia (EUR €)
  • Denmark (EUR €)
  • Estonia (EUR €)
  • Finland (EUR €)
  • France (EUR €)
  • Germany (EUR €)
  • Greece (EUR €)
  • Hungary (EUR €)
  • Iceland (EUR €)
  • Ireland (EUR €)
  • Italy (EUR €)
  • Latvia (EUR €)
  • Liechtenstein (EUR €)
  • Lithuania (EUR €)
  • Luxembourg (EUR €)
  • Malta (EUR €)
  • Monaco (EUR €)
  • Montenegro (EUR €)
  • Netherlands (EUR €)
  • Norway (EUR €)
  • Poland (EUR €)
  • Portugal (EUR €)
  • Romania (EUR €)
  • Serbia (EUR €)
  • Slovakia (EUR €)
  • Slovenia (EUR €)
  • Spain (EUR €)
  • Sweden (EUR €)
  • Switzerland (EUR €)
  • Ukraine (EUR €)
  • United Kingdom (EUR €)
Log in
No account yet? Create Account
  • Albania (EUR €)
  • Andorra (EUR €)
  • Austria (EUR €)
  • Belgium (EUR €)
  • Bosnia & Herzegovina (EUR €)
  • Bulgaria (EUR €)
  • Croatia (EUR €)
  • Cyprus (EUR €)
  • Czechia (EUR €)
  • Denmark (EUR €)
  • Estonia (EUR €)
  • Finland (EUR €)
  • France (EUR €)
  • Germany (EUR €)
  • Greece (EUR €)
  • Hungary (EUR €)
  • Iceland (EUR €)
  • Ireland (EUR €)
  • Italy (EUR €)
  • Latvia (EUR €)
  • Liechtenstein (EUR €)
  • Lithuania (EUR €)
  • Luxembourg (EUR €)
  • Malta (EUR €)
  • Monaco (EUR €)
  • Montenegro (EUR €)
  • Netherlands (EUR €)
  • Norway (EUR €)
  • Poland (EUR €)
  • Portugal (EUR €)
  • Romania (EUR €)
  • Serbia (EUR €)
  • Slovakia (EUR €)
  • Slovenia (EUR €)
  • Spain (EUR €)
  • Sweden (EUR €)
  • Switzerland (EUR €)
  • Ukraine (EUR €)
  • United Kingdom (EUR €)
  • English
  • Deutsch
  • Français
  • Norsk
  • Svenska
  • Suomi
21energy logo darkgreen
Search
Cart (0)(0)
  • Heaters
    • Home Heaters
    • Industrial Heaters
    • Heater Accessories
    Ofen 2
    Bestseller
    2 Colours

    Ofen 2

    -15% €1.780,00
    €2.090,00
    Ofen 2 Pro
    New
    2 Colours

    Ofen 2 Pro

    -10% €2.240,00
    €2.490,00
    Edge
    Edge - 21energy Edge - 21energy

    Edge

    €6.400,00
  • For Bitcoiners
    • Bitcoin Heater
    • Bitcoin Miner
    • Solo Miner
    • Miner Controller
    • Mining Equipment
    • Services
    Ofen 2
    Bestseller
    2 Colours

    Ofen 2

    -15% €1.780,00
    €2.090,00
    Ofen 2 Pro
    New
    2 Colours

    Ofen 2 Pro

    -10% €2.240,00
    €2.490,00
    Bitmain Antminer S19k Pro
    Bitmain Antminer S19k Pro - 21energy Bitmain Antminer S19k Pro - 21energy
    Bestseller

    Bitmain Antminer S19k Pro

    -10% €690,00
    €770,00
    Canaan Avalon Q 90 TH
    Canaan Avalon Q 90 TH - 21energy Canaan Avalon Q 90 TH - 21energy
    Bestseller

    Canaan Avalon Q 90 TH

    -15% €1.990,00
    €2.340,00
    Bitmain Antminer S9 13.5 TH
    Bitmain Antminer S9i 13.5 TH - 21energy Bitmain Antminer S9i 13.5 TH - 21energy
    Bestseller

    Bitmain Antminer S9 13.5 TH

    -30% €59,00
    €84,00
  • Support
  • About us
  • Business Solutions

Verifying your email...

Spin & get a discount for your first order

Confirm your email

We've sent you a confirmation email. Please confirm your address in your inbox and we'll send your discount code right after.

Shop now

Confirming your email...

Oil vs. Bitcoin Heating: End Your Dependency on Fossil Imports - 21energy
May 13, 2026

Oil vs. Bitcoin Heating: End Your Dependency on Fossil Imports

The Strait of Hormuz has been effectively closed to commercial shipping for ten weeks. Oil throughput has dropped to ...

Read article
  • Subsidies for replacing heating systems: clever use of subsidies - 21energy

    Subsidies for replacing heating systems: clever use of subsidies

    January 30, 2025
  • How the heat pump works - simply explained - 21energy

    How the heat pump works - simply explained

    January 28, 2025
  • Incentives for Heat Pumps in Austria – Your Step-by-Step Guide - 21energy

    Incentives for Heat Pumps in Austria – Your Step-by-Step Guide

    January 28, 2025
  • Cozy Warmth in the Living Room: How to Heat Efficiently and Sustainably - 21energy

    Cozy Warmth in the Living Room: How to Heat Efficiently and Sustainably

    January 28, 2025
  • Revolution in heating technology: How efficient are electric heating systems really? - 21energy

    Revolution in heating technology: How efficient are electric heating systems really?

    January 28, 2025
  • Myths and facts: Which heating system is the best? A comprehensive comparison - 21energy

    Myths and facts: Which heating system is the best? A comprehensive comparison

    January 28, 2025
  • Calculating heating costs: everything you need to know - 21energy

    Calculating heating costs: everything you need to know

    January 27, 2025
  • Winter garden heating: tips and technologies for year-round comfort - 21energy

    Winter garden heating: tips and technologies for year-round comfort

    January 27, 2025
  • Heating with electricity or gas? A comprehensive comparison - 21energy

    Heating with electricity or gas? A comprehensive comparison

    January 27, 2025
  • Alternative heating in old buildings: Efficient solutions for old buildings - 21energy

    Alternative heating in old buildings: Efficient solutions for old buildings

    January 27, 2025
  • Electric heating consumption - How to heat economically with electricity - 21energy

    Electric heating consumption - How to heat economically with electricity

    January 27, 2025
  • Bedroom heating: How to create the perfect feel-good temperature - 21energy

    Bedroom heating: How to create the perfect feel-good temperature

    January 27, 2025
  • 1
  • 2
  • 3
  • 4
  • 5

Blog 21energy

21energy logo white

Sustainable heating

Business
  • About us
  • Careers
  • Blog
  • Press
Business
  • About us
  • Careers
  • Blog
  • Press
Help & Resources
  • Personal analysis & consultation
  • Mining Calculator
  • Profitability Calculator
  • Solo Mining Calculator
  • PV-Mining Calculator
  • Manuals
  • Support
Help & Resources
  • Personal analysis & consultation
  • Mining Calculator
  • Profitability Calculator
  • Solo Mining Calculator
  • PV-Mining Calculator
  • Manuals
  • Support
Account
  • Orders
  • Account
Account
  • Orders
  • Account
Legal
  • Order Withdrawal
  • Refunds & Returns
  • Terms & Conditions
  • Privacy Policy
  • Legal Notice
Legal
  • Order Withdrawal
  • Refunds & Returns
  • Terms & Conditions
  • Privacy Policy
  • Legal Notice
  • English
  • Deutsch
  • Français
  • Norsk
  • Svenska
  • Suomi
  • Albania (EUR €)
  • Andorra (EUR €)
  • Austria (EUR €)
  • Belgium (EUR €)
  • Bosnia & Herzegovina (EUR €)
  • Bulgaria (EUR €)
  • Croatia (EUR €)
  • Cyprus (EUR €)
  • Czechia (EUR €)
  • Denmark (EUR €)
  • Estonia (EUR €)
  • Finland (EUR €)
  • France (EUR €)
  • Germany (EUR €)
  • Greece (EUR €)
  • Hungary (EUR €)
  • Iceland (EUR €)
  • Ireland (EUR €)
  • Italy (EUR €)
  • Latvia (EUR €)
  • Liechtenstein (EUR €)
  • Lithuania (EUR €)
  • Luxembourg (EUR €)
  • Malta (EUR €)
  • Monaco (EUR €)
  • Montenegro (EUR €)
  • Netherlands (EUR €)
  • Norway (EUR €)
  • Poland (EUR €)
  • Portugal (EUR €)
  • Romania (EUR €)
  • Serbia (EUR €)
  • Slovakia (EUR €)
  • Slovenia (EUR €)
  • Spain (EUR €)
  • Sweden (EUR €)
  • Switzerland (EUR €)
  • Ukraine (EUR €)
  • United Kingdom (EUR €)
Visa
Mastercard
Maestro
American Express
Klarna
EPS
Apple Pay
Google Pay
Bitcoin
Geizhals Preisvergleich idealo - beliebteste Plattform für Preisvergleiche in Österreich seit über 20 Jahren
© 2026 21energy • Cookie Settings
Shopping cart
Free Shipping Truck Only left until free shipping
Package Icon
Shipping costs:
📦 Weight: 0.0kg
🌍 Zone: ...
💰 Current shipping: ...

Your cart is empty

Start shopping

Loading...

Recommendations for you
Ofen 2 Pro
Ofen 2 Pro

Ofen 2 Pro

€2.240,00 €2.490,00
Ofen 2
Ofen 2

Ofen 2

€1.780,00 €2.090,00
Bitmain Antminer S19k Pro
Bitmain Antminer S19k Pro

Bitmain Antminer S19k Pro

€690,00 €770,00
Bitmain Antminer S9 13.5 TH
Bitmain Antminer S9 13.5 TH

Bitmain Antminer S9 13.5 TH

€59,00 €84,00
Total:
€0,00
Visa
Mastercard
Klarna
Apple Pay
Google Pay
Bitcoin

You've earned 3.5% off!

Welcome! You've been referred by a friend and earned 3.5% off your order with our refer-a-friend program. Start shopping to use your discount!

  • Choosing a selection results in a full page refresh.