Yes, the heat energy your solar thermal panels generate can be used to supplement your existing central heating system. How this works is that the heat your solar thermal panels collects is circulated through your home’s radiators or underfloor heating setups and used to warm your home in combination with your existing system of boilers or heat pumps.
While this is possible, however, there’s a major flaw in the logic: the time of year you’re most likely to need central heating (the colder months) is also the time of year your solar thermal panels will be least effective (the darker months). With the energy that your solar thermal panels can produce vastly diminished, they aren’t a cost- or energy-efficient choice for heating your property in winter.