Ceil Heat radiant heating thermostat question
 

This house was built in 1969 using a system built by Ceil Heat in Knoxville Tenn and they are long gone. I need to replace several thermostats that run wide open unless you turn the setting to OFF. Guess age has wore out the insides? Is there a place to find a replacement part or is there something else I can use in place of the original ones. The part number is Model CHT-DI-22 AMP
It's a 125/250 VAC ONLY

Thanks in advance!!

I have a house the same age with a similar problem.
Can anyone help?

Shop around for a >22 amp line voltage thermostat or
get a >22 amp, 240 vac relay and a 'stat that can handle the coil current for said relay.

Posting legible copies of whatever schematics you have wouldn't hurt, either. It might not be the 'stat.