Just for S&G's, I picked up an Edenpure 5000 BTU space heater at the thrift, I generally haunt. I just wanted to see, why fools would pay close to $400 for an electric space heater, with the same heat output as a $20.00 unit.
I plugged it in and it produced a little heat. It turns out, that it uses three quartz tubes for the heat source. Two are blown. The only good one looks like it's ready to blow.
There's various replacements, on Eplace. The cheaper Chinese KO's look better than the originals and a lot cheaper.
I'm not going to repair it right away, possibly never!