My 1988 Adler Barbour unit (air cooled) just gave out.
Seeing as how it has lasted since 1988 that gives me a good feel for the quality of the units. I understand they are far better with less current draw these days.
The way I see it. Why mess with something that proved itself to be a die hard.
Just like the Groco toilet. My existing has started to have seal leaks after being installed way back new in 1988. I think I'll simply go for a new Groco.