The cost of solar underfloor heating depends on a number of factors, including which system you opt for and the amount of floor space that you have.
The cost of solar underfloor heating will be higher than regular systems, due to the fact that solar panels will also need to be installed. If solar panels are already installed, this will drastically reduce the overall costs.
In any event, while the initial costs may seem high, the benefits are endless, and the payback period for PV solar panels is around 7 years on average, giving you free electricity for around two more decades for free.
As underfloor heating is incredibly energy efficient, the savings will be even more. Underfloor heating costs will depend on the installer and the materials they use, so the best method of gauging the price is to receive a quote from a reputable installer.