Heating with photovoltaics - sustainable and cost-saving
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Photovoltaics is one of the key technologies of the energy transition. Self-generated solar power not only offers advantages in terms of electricity supply, but can also be used for heating in a cost-effective and environmentally friendly way. By using surplus energy for heating, households can become less dependent on fossil fuels and reduce their energy costs in the long term.
How does heating with photovoltaics work?
A photovoltaic system converts sunlight into electricity that can be used in various heating systems:
- Heat pumps: Powered by solar electricity, they extract heat from the environment and heat your home with virtually zero emissions.
- Direct heating systems: Electric heating systems use the electricity produced directly - ideal for well-insulated buildings.
- Water heating: Surplus solar power can be used to heat water in storage tanks, saving additional heating costs.
- Bitcoin heaters: As well as producing heat, this type of heater mines bitcoins - so you earn money while heating
Optimum use of solar power requires intelligent load management so that energy production is coordinated with consumption.
„Those who make optimum use of photovoltaics reduce their energy costs and actively contribute to climate protection. The combination with Bitcoin heating systems or heat pumps in particular shows how efficient this technology is.“
Ofen 2 in a nutshell
More warmth, more bitcoin, & zero compromise.
Ofen 2
New1,000 WPower50 m²Area heated32 dBNoise levelup to 35 TH/sMining power€ 0.10 / kWhBitcoin reward
(1-year average)
As of 06.2025€ 0.22 / kWhBitcoin reward
(4-year average)
As of 06.202590 x 32 x 14 cmSize24 kgWeight€1.650,00-21%€2.090,00incl. VAT & shippingBuy now
Free shipping30-day-returnMade in Austria
Advantages and challenges of heating with photovoltaics
Advantages:
- Reduced energy costs: Self-consumption significantly reduces running costs.
- Climate protection: Photovoltaics is an emission-free technology and therefore helps to reduce CO₂ emissions.
- Independence: With your own system, you reduce your dependence on rising electricity and heating costs.
Challenges:
- High initial costs: The initial costs can be high, but are offset by savings in the long term.
- Weather dependency: In winter or in bad weather, additional electricity from the grid is often required.
- Storage requirements: Batteries are required to use surplus electricity efficiently.
Tip: In order to weigh up the costs and benefits optimally, professional energy advice is recommended.
Costs: Photovoltaic heating compared to alternatives
The initial investment in a photovoltaic system often pays for itself after a few years. A comparison of the costs:
| Heating system | Acquisition costs | Running costs (p.a.) | Savings potential |
|---|---|---|---|
| Photovoltaics + heat pump | € 15.000 – € 25.000 | Very low | High |
| Gas heating | € 10.000 – € 15.000 | Medium (€800–€1.200) | Medium |
| Oil heating | € 8.000 – € 12.000 | Very high (€3.000–€5.500) | Low |
| Direct heating (without PV) | € 1.000 – € 5.000 | Very high(€1.500+) | Very low |
| Photovoltaic system + Bitcoin heating | € 10.000 – € 15.000 | - | Very high |
Calculate your annual heating savings
Practical tips for using photovoltaics for heating
- Storage solutions: Batteries or thermal storage units help to avoid energy losses and use electricity even at night or when it is cloudy.
- Intelligent load management: Optimize the use of energy-intensive appliances by operating them during periods of high energy production.
- Check funding opportunities: Subsidy programs can cover a considerable part of the investment costs.
Would you like to purchase a photovoltaic system for your home? We've summarized the most important information for you in our beginner's guide to photovoltaics at home!
Integration of smart home technologies for maximum efficiency
The combination of photovoltaics with modern smart home technologies enables even more efficient use of self-generated solar power. Intelligent energy management systems can analyze power consumption and automatically operate devices such as heaters or hot water tanks at the optimum times. This maximizes self-consumption and further reduces dependence on the public power grid.
Apps and control software also provide a transparent overview of the energy flow so that users have control over their consumption data at all times.
Long-term prospects: photovoltaics as part of a sustainable energy concept
Heating with photovoltaics is not only a short-term solution for reducing energy costs, but also an important building block for a sustainable future. With the ongoing development of storage technologies and ever more efficient solar modules, it will be even easier in future to cover a household's entire energy requirements with renewable energies. Anyone who invests in a photovoltaic system today will benefit from stable energy costs in the long term and actively contribute to climate protection.
Photovoltaics and Bitcoin heaters: An innovative combination
Bitcoin heaters from 21energy are an interesting addition to conventional heating systems. These devices use surplus solar power to mine Bitcoin and provide heat for your home at the same time.
Advantages of the Bitcoin heater:
- Dual use: while surplus electricity is used for mining, the heat generated in the process is used directly.
- Additional source of income: With Bitcoin heaters, you not only generate heat, but also Bitcoin.
21energy offers innovative solutions that can be perfectly combined with photovoltaic systems to maximize both ecological and economic benefits.
Ofen 2 in a nutshell
Ofen 2
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As of 06.2025
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