Alternatives to forced hot air in-wall units
I'm currently storing 9 240VAC 500 watt radiant (or infrared) panels; not sure if I'll use them or not, but they certainly exist in the US market. Mine were taken out and replaced with an oil-fired boiler as a less expensive source of heat. The space they were in had at least a 10 ft ceiling and they were ceiling-mounted, and quite effective, just expensive to run compared to other heat sources. They are a low-mass structure (steel panel with heating element attached, insulation behind.)

Storage/mass would only make sense if you had different electricity rates at different times - all electric resistance heat is basically 100% efficient; though cold-climate heat pumps can be 300% efficient and are thus a better choice if using electricity for heat. Mass makes the system slower to respond, not more efficient.

Without bothering to do an extensive search, I was able to quickly find 240V 250W panels in the USA currently. "240v radiant panel" as a search term, sift the bad results manually (I got 120V &amp; hot water radiators mixed into my results along with the correct item.)

If your condo is poorly insulated and/or has inadequate power provisioned for the living room heat circuit, you may need to upgrade that or add additional circuits to provide adequate heat. Unless you have bizarrely low electricity rates or very limited need for heating at all, some other heat option will probably be cheaper to operate, but that depends on what you have available in your local market / at the condo.

Fluid-based radiant floor &amp;/or wall heat (with whatever is the least expensive available method heating the fluid) is one option, but it is a major job to retrofit it, much easier/cheaper to build it in than to add it later.