My primary parts cleaner is a 55-gallon drum. It has a false floor about
12 inches down. Another 12 inches down is the pump.
I use kerosene or diesel oil.
The bottom 10-12" is water. The idea is that the heavier particles
settle into the water and keeps the solvent cleaner. Seems to work.

As far as I know the water/soap types must be heated to work well.

If you have one of the Chinese units with a flat bottom, a magnetic
engine heater is perfect for that.

Have you found need of disposing of the solvent? If so, where to you
off load the kero or diesel? This to me is the biggest issue.

My parts washer is infact of of the chinese units. I have a brick
under the legs opposite of the pump end and then a couple more bricks
inside of the tank to reduce the volume

The idea of needing to heat up the water based cleaner does not appeal
to me - I do not use the parts washer frequently and consequently
would not want to keep it heated up, on the other hand when I want to
use it, I would not want to have to wait for the solution to heat up.