Heating units- how often to you clean or replace

[Elmareefer]

Just wondering how often you clean or replace?
I have this unit. It talks about soaking the unit in vinegar dilution but how often? Also should you just replace the entire unit every other year?

 

[griss]

Clean? What’s that lol.

I’d soak in vinegar when/if calcium or other gunk builds up on it. I don’t replace mine until they fail or I notice a worn cord, etc.