ᐅ Invisible Radiators

Hello,
I am currently buying an apartment that is being renovated by the seller. Unfortunately, they cannot install underfloor heating, so we will need to use radiators (but not placed in front of the windows; wall heating and cooling ceilings are also not an option). Do you know of any radiator solutions or models (water-based, not electric) that are stylish, discreet, and save wall space? This is not about the bathrooms but the bedrooms and living areas. Ideally, the radiator elements would only be mounted on the wall.
Thank you and best regards,
Paul

Off the top of my head, I can only think of flat panel radiators and mirror radiators. Just try asking good old Google 😉

Ceiling heating systems are still available as well....