A company's approach is visible in what its products do not have. Three decisions describe this range better than any statement of values would.
The supply already has pressure
The under-sink and commercial systems are built to work on the pressure a municipal supply provides, without a booster pump and without an electrical connection. That removes the noisiest component, the one most likely to fail, and the requirement for a socket in a cabinet that rarely has one. It also puts a condition on the installation: each model carries a minimum inlet pressure, and below it the specification does not hold.
Stages in one body rather than four housings
Integrating stages reduces the number of housings, seals and connections in a cabinet nobody looks inside between services. The cost is stated plainly elsewhere on this site: a combined cartridge retires stages that still had life in them, which is a real trade and not a free win.
One model that breaks the rule
The A95R has a 25W priming pump and a 12-24V supply, and it is the one model in the range rated for open sources such as a river or a lake. It exists because the rest of the approach depends on a mains supply that some sites simply do not have.
Everything above is a design position rather than a specification. The figures — output, minimum pressure, service intervals — are published per model, because that is the only level at which they mean anything.
