Harnessing thermal energy: generating heat via solar-powered water systems
Solarthermie, the conversion of sunlight into heat and hot water, is gaining traction as an eco-friendly energy solution for households. This technology, which is distinct from photovoltaic systems that generate electricity, can be a cost-effective means of meeting heating and hot water needs.
One of the key advantages of Solarthermie is its lower acquisition costs compared to photovoltaics. For those considering a switch, the good news is that solar thermal systems can be combined with a variety of heating systems, such as heat pumps, pellet heating, and gas heating, creating a hybrid solar system.
The costs of a solar thermal system can vary significantly, depending on factors like the capacity of the system, type of collectors, size of the hot water storage tank, location and orientation of the house to the sun, and necessary renovation measures in the building. On average, a solar system with storage in a single-family house ranges between 5,000 and 15,000 €.
Fortunately, there are several financial incentives to encourage the adoption of solar thermal energy. Homeowners can apply for a grant from the state funding bank KfW through program 458 for the purchase and installation of a solar thermal system. The grant within the framework of the new heating funding is at least 30% of the costs, but can be increased to a maximum of 70% through various bonuses, such as the Efficiency Bonus (up to 5% of the costs for a solar thermal system) and the Climate Speed Bonus (providing up to 20% of the costs for a heating system replacement by 2028).
Additionally, private renovation loans can be used to finance a solar thermal system, and households with an annual income of up to 40,000 € may qualify for the Income Bonus, which can provide up to 30% of the costs. For households with taxable income below 90,000 €, additional loans from KfW (Programme 358, 359) can be applied for, amounting to a maximum of 120,000 € per residential unit.
It's essential to carefully calculate the economic viability of solar thermal energy based on individual factors such as insulation of the building, hot water consumption, and technology used in the home. With the right considerations, solarthermie can cover around 60% of a household's hot water needs and around 25% of the heat required for heating.
In conclusion, solarthermie offers an attractive and environmentally friendly alternative for meeting heating and hot water needs. With the help of state funding programs, grants, and loans, the costs of investment can be significantly reduced, making it an appealing choice for many homeowners.
