Space heating from photovoltaics



Solar energy, and thus also electricity from your own photovoltaic system, is available in abundance during the day. In the evening or in winter, when more electricity is needed, the sun is gone. This means: storage is the central point with regard to renewable energies. As a rule, one third of the self-generated energy is used and two thirds of it is fed back into the grid. The payments for this have generally been falling for years. On the other hand, those for fossil fuels such as gas and oil are rising, and the general cost of electricity is also steadily increasing. On the other hand, photovoltaics are becoming cheaper and more effective - more surplus electricity is being generated. Our goal must therefore be to use more photovoltaic electricity for our own consumption.


How about an electric heating system using electricity from the photovoltaic system?

In order to do so, you need to know that in our latitudes, photovoltaics can also supply appreciable energy in winter. Especially because electric heaters have the reputation of being very expensive to operate, self-produced photovoltaic electricity is an exciting alternative. With our innovative products, you can finally keep the energy in the house to use it for something useful like heating. Of course, you don't have to do without supplying both your electricity needs and hot water via the photovoltaic system.


Space-saving – Economical – Efficient – Upgradeable

Electric heating with electricity from the photovoltaic system saves enormous investment costs! The operating costs are also reduced by up to 30 % compared to conventional heating systems. However, this requires a well-insulated building. Nowadays, however, this is usually self-explanatory in new buildings and renovations.

Compared to photovoltaics, a heat pump can "only" generate heat. It does not make any contribution to the electrical consumers in the building. In contrast, photovoltaics supply the normal electrical household consumers primarily before heat generation and thus contribute to reducing operating costs to the greatest extent possible. The remaining energy required for heating is drawn from the public electricity grid. The exact amount hereby depends on the insulation of your living space and the dimensioning of your photovoltaic system.

Photovoltaic electricity for space heating: How does this work technically?

The prerequisite for heating with photovoltaics is a well-insulated building and a powerful photovoltaic system. Ideally, all suitable roof surfaces are used completely for electricity generation. If the heating requirement per square metre and year is less than 50 kWh, space heating can be covered sensibly and efficiently with photovoltaics.

Good to know: Our system can also be used to support an existing water-based room heating system. The heating element is then either installed in the combination or buffer storage tank, or two heating elements (hot water storage tank, heating buffer) are connected.

Depending on how much sun is available, the energy is stored in the hot water and in the heating. This all works in a stepless and precisely metered manner. This makes an electric heating system suitable for photovoltaics, this way it gets "PV-ready"!

Hot water & space heating combined

Our principle of heating with photovoltaics works reliably and without line losses. In the long term, this is the best solution for low-energy houses. Electricity from your photovoltaic system provides a comfortable room temperature simply and directly.

You reduce the technical effort for heat generation to an absolute minimum and operate a system that does not require extensive service and maintenance. Unlike heat pumps, you have a silent, more or less invisible system.

This is how you know photovoltaic systems ...

Household consumers are supplied, surplus energy is fed into the grid. The share of self-consumption is low.

Surplus energy can also be used to heat water. Stepless and grid-compliant. This supports the economy and protects the electricity grids.

Optionally, the AC•THOR can also supply electric heating systems with clean energy from the photovoltaic system.

Modern houses require less electricity from the grid for space heating with the AC•THOR than with heat pumps. And with "cables instead of pipes" everything is much simpler and cheaper.


​​You can achieve all this with a compact, intelligent device, our AC•THOR or AC•THOR 9s for larger systems.

Is generating heat for space heating with photovoltaic electricity economical?

We have been facing enormous price increases of gas and oil for a long time. At the same time, the costs of solar power are falling and photovoltaics are becoming more and more efficient. Seen in this light, generating space heating with photovoltaics is more economical in the long term than operating a gas or oil heating system. Basically, every kilowatt hour that is powered by solar electricity instead of grid electricity counts. This protects the environment and the climate and reduces heating costs. Do you ask yourself:

  • How high is the current feed-in tariff of solar electricity?

  • How expensive would space heating be if you had to buy it in or produce it in another way?

  • In which case do you gain more: if you feed the electricity into the grid or use it yourself?

What costs can be expected for a purely solar-electric house?

The size of the photovoltaic system influences operating and investment costs equally. In general, the greater the photovoltaic output, the lower the subsequent operating costs. If a single-family house is equipped with a 10 kWp photovoltaic system, for example, the costs for the purchase are not even higher than the comparative variant with an air heat pump, but the operating costs (electricity, hot water and space heating) will also be significantly lower. In Austria, a reduction in running costs of up to 30 % can be assumed, in Germany even 45 % is possible!

Make an initial cost estimate? Calculate and compare savings? The my-PV Power-Coach will help you calculate your possible savings and design your system.

Calculate now

Your benefits with space heating with photovoltaics

What points speak in favour of generating heat with your own solar power from the photovoltaic system? Heating with photovoltaics means 30 % lower operating costs and up to 30 % lower investment costs compared to conventional heating systems (e.g. air heat pumps). Maintenance costs are zero. They generate the energy themselves, consume it efficiently and sensibly directly on site, and can store it.

With a water-guided heating system, the primary heating system should be switched off during high-yield photovoltaic months - this protects the heating system, saves operating costs and extends the service life of your heating system. 

Space heating with photovoltaics …

  • saves energy costs through lower demand from the conventional and increasingly expensive electricity grid.

  • improves the carbon footprint through self-generated solar power.

  • ensures optimal use and storage of solar energy.

  • saves fossil fuels such as gas and oil.

  • reduces the uneconomical feeding of the surplus into the electricity grid through higher self-consumption.

  • does not need additional pipelines, pumps, etc.

  • is noiseless.

  • is space-saving – no heating and fuel storage room necessary.

  • is also easy to use for renovations (e.g. no chiselling work required on the screed).

  • is of course also possible in water-guided heating systems.

  • protects your existing heating system and extends its service life.

    • generates heat where it is needed.

Take a look at some of our reference projects

Single-family home in Upper Austria

Renovated single-family home in Upper Austria

A solar-electric housing project in Graz

Applications of the innovation from my-PV for heating with photovoltaics

In which areas and under which circumstances can heating with photovoltaic power be used?


my-PV GmbH
Betriebsstraße 12
A-4523 Neuzeug

+43 7259 39328

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About us


We at my-PV get more out of photovoltaics than just electricity, we move your building technology into the future. Use your solar power yourself instead of feeding it into the public grid: Electricity, hot water, heating and charging options for your e-car. With our products, you can use your self-generated photovoltaic electricity for your own needs without any detours. This way, you save costs in the long term and act environmentally friendly!



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