Roof with photovoltaic system

Heating with photovoltaics

A photovoltaic system on the roof turns every homeowner into a power producer. The electricity generated can be used for personal consumption or fed into the public grid – although this is becoming less attractive due to low feed-in tariffs. According to the German Environment Agency (UBA), heating accounts for around 75 percent of total energy consumption in private households.

A good reason to use self-generated solar power for heating your home instead. Another advantage is that the cost of photovoltaic systems continues to fall, self-produced solar electricity is cheaper than grid power, and electricity prices are likely to keep rising in the coming years. In addition, solar power is renewable, environmentally friendly, and allows homeowners to become more independent.

Photovoltaics

In a house with around 180 square meters of living space, a photovoltaic system with 13 kWp can cover a significant portion of both the electricity and heating demand. The electrical energy is stored as heat. In winter, a wood heating system provides additional support – either as a fully automatic pellet boiler or as a water-bearing tiled stove or fireplace.

House with installed solar panels on roof

Heating center as an energy manager

The better the interaction between wood heating and photovoltaics works, the greater the overall benefit. This is where the BRUNNER Heating Center (BHZ) comes into play.

It serves as the central interface between the heating and photovoltaic systems, harmonizing energy generation, distribution, and consumption throughout the house. Through a single control interface – which can be installed anywhere in the home – the user has all information at a glance without needing to make manual adjustments. The intelligent control system operates according to an eco-hierarchical principle, ensuring efficient energy use and distribution.

Log wood boiler adds comfort

Log wood gasification boilers add a new level of comfort to this heating system. During the summer months, heating with wood is unnecessary, as the photovoltaic system provides enough thermal energy for domestic hot water. In the transitional seasons, integrating photovoltaics into the heating system supplies more energy than comparable solar thermal systems, allowing for very long intervals between firings of the log wood boiler.

For darker days, BRUNNER boilers come equipped with an automatic ignition system as standard. Once the system storage tank is fully charged, the boiler is loaded with another batch of wood. When the stored heat energy is depleted, the boiler ignites automatically and recharges the storage unit. Only when this reserve is also used up does the homeowner need to refill it manually.

Scheitholzkessel und Heizzentrale
BRUNNER log wood boiler BSV with heating center

What about longer absences?

An additional oil boiler is not necessary because the photovoltaic integration will try to stretch the stored heat as long as possible and keep the building at the desired temperature. If this is no longer possible, electric heating can be activated automatically using grid power – but only exactly as much as the system calculates or as the homeowner manually sets.

Conclusion

Using solar power and heating with sun and wood, whether with pellets or log wood, has never been easier than with a BRUNNER heating system. The requirements for being “simple,” “clear,” “renewable,” “highly efficient,” “eligible for funding,” and “smart” are fully met through perfectly coordinated components.

Expert advice

The modern combination of sun and wood is more convenient than many might think. When building a new heating system or upgrading an existing one, be sure to consult a professional and mention this combination option if applicable.

Portrait of Klaus, Head of Customer Service
Klaus Leihkamm, Head of Craftsman Consulting & Customer Service

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