Home warranty for repairing floor heaters?

Has anyone had any luck having home warranty repair or replace floor heaters in 4 unit building?

We just closed on a 4 unit building in Southern California. Each unit is 1bedroom/1bath, they have floor heaters, that are installed under the floors in the crawlspaces. When we did home the inspection the tenants said they have never used them. Now looking into checking them, I couldnt find any with a wall thermostat to control them.

Any suggestions on how I should handle this with the home warranty? Would this item be covered? Should I just call and say, help the heaters dont work?


Thanks
JC