I'm just recently into the US and cleaning game ...
Bought a Trusonik 1.5L (60W with 100W heater) from ebay,
I do 10:1 with vinegar and then 10:1 soak in simple green, then a soak in clean water to get rid of the simple green funk (as per my reg instructor).
5 minutes is plenty, and metal parts with plastic go in for 2-3 minutes into the cycle (probably the whole cycle could be shorter honestly, but it works for timing as I'm cleaning/moving parts from the next step to the rinse). As I use it more, I'll figure out to do either shorter cycles, or dilute it down more.
I don't think it's big enough to hold a centre manifold in one go as is (but maybe), but holds a balanced diaphragm 1st stage no problem.
BRad