I bought my Spectra 200C 20 years ago. One reason, was sailing on a boat
with a PUR35. The '35 seems to use a ram pump design. So it would "wind up, then slam" every few seconds. To me it sounded like something that needed to be fixed ASAP. My ear is tuned for things that don't sound 'right' when sailing. So trying to ignore or accept this slamming, was a risk to ship's safety
. The CAT pumps simply need too much power
, compared to the Spectra designs.
The extra $$ for the Spectra was considerably more, and soon forgotten.
My 20 year old Spectra 200C still makes 6gph on 7 amps straight off the solar panels
. Its steady hum is a much more natural sound. Also, only consumables have been replaced. No repairs
have ever been needed. The modular design let me tuck its parts away as I could fit them in the head. It's not cheap
, but quietly sailing along whilst making fresh water from sunshine is pure Freedom . Cheers.