I wasn't being facetious in the least and offered several examples. There's not really a reason to be unappreciative or sarcastic unless you're waiting for someone else to search through all the heaters on the market and make a specific list for you...?
There are several controllable heaters on the market that fit in AC20s, AC30s.
Best of luck to you.
Thanks for that.
I actually have already heard of Google but I still haven't been able to find a heater with a thermostat that will fit into an HOB filter sized for the Ebi. Amazingly, I was able to use the interweb and had already found all of those retailers and brand names that you illuminated.