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you need to show how you arrived at this transfer function

Your new board has some sort of grey paste around the base of the electrolytic capacitors. Is that intentional? Unusual for printed circuit boards. You might check the voltage across the electrolytic capacitors when powered. Then when with outpower, check their resistance with an ohm meter in...

With old compressors like that, the bearings get warn, and would not start only to blow the breaker and shutdown. Recognizing the motor/compressor was 20+ years old, after checking for shorts, the tech put in a larger starting capacitor and it ran. He mentioned, that we really needed a new...

Fluid composition solids content, etc., installation, including pipe size. Summary if issues encountered, and frequency of re-occurance. Please explain why you are seeking a retractable design, since inline measurement are used in the original design.

What ambient temperature, is your heat pump dealing with

https://www.energy.gov/energysaver/heat-pump-water-heaters

If used for temperature control of you living space, you need an updated controller suitable for your unit. The conventional thermostats are on-off for preselected heat or cooling only. But, as your intro refers to water heating, you need to sort out what you want the unit to accomplish.

Basically, you'll have to go through the process design, and review the design ratings of all components and processes down stream.

what do you mean by a "product catalogue"

Your supplier can direct you

Irregular flow distribution, seems to be the most likely in such a case

Be sure to check the fuel valve actuators, under flowing conditions

Best to contact your manufacturer

Keep it simple, the operating and maintenance personnel, have to identify real world operational problems on the fly.

Diesels are more efficient at coolant temperatures exceeding 80 Deg C, and must be kept warm by blocking the radiator on large trucks in cold weather.

The capacitor is supposed to disconnect (RPM Switch) after starting pump. Check your pressure controller too.

your process operating environment dictates your options, as you have noted.

Great Summary WTF, you've been there done that for sure!

RTD's are typically insulated from ground, so the cable wiring to the RTD including the shielding must be referenced to the DCS ground not a ground connection in the field.

for control panels typical meter instrumentation used by instrument and electrical technicians is more than adequate.