UK-based company Eskimo was formed for a single purpose: “To save the world from the ugly and impractical saboteurs of interior design,” meaning radiators.
We looked at their Modernist towel heater here, and their Cliff series of regular radiators is worth a look. Monolithic in appearance, they’re covered in stone veneers.
The stone fascias are available in a variety of finishes, and the aluminum radiators within can be ordered in either water or electric. The veneers are thin enough that they can safely be wall-mounted, in either horizontal or vertical configurations, in standard construction; there’s no need to reinforce the wall.
These run £1,763 (USD $2,240) to £3,810 (USD $4,830), and have a lead time of 4-6 weeks.