Heat here is forced air over three ten kilowatt heat coils.
Over time, the wiring gets old and brittle.
Also, the relay that is supposed to pick to energize the coils doesn’t sound like it is picking since it isn’t buzzing anymore.
So it may be a matter of replacing the relay, the wiring, and the heat coils.
They have been in there since the place was built.
A number of questions, of course.
How much space needs to be heated?
How’s the electrical wiring elsewhere?
Do the heaters need to be “installed”, or can they be free-standing?
Why electrical? Is there no gas service?
Any other clues?
Oh, yeah.
Is this your house or your workplace?