Zahm and Nagel specifies 100 Watts/gallon of capacity. Be sure the US cleaner you're buying is powerful enough. Some of the cheap ones are pretty puny. Be sure it has a heater to keep your cleaning solution at 160F+.
I'd strongly recommend buying the largest cleaner you can afford. Once you start using it, you'll find it significantly speeds up and eases small parts cleaning. When ours broke down a few years ago, the brewer just about revolted at having to go back to hand-scrubbing everything. Ours has a 12 gallon capacity.
We use caustic lye in the cleaner, at about 1 cup/12 gallons of 160F water. We then use a passive rinse in cold water, then straight to the Grant w/PAA sanitizer. Parts are hand-washed for any heavy deposits before the US cleaner. This keeps the cleaning solution cleaner. We use the same fill of caustic and hot water for a full day.
You have to be somewhat careful with stones and sight glasses. They should not be in contact with anything else, or the stone will have its pores peened closed and the sight glasses will be scratched and fogged.
Timm Turrentine
Brewerywright,
Terminal Gravity Brewing,
Enterprise. Oregon.