Which type of 2 port valve

[Disk]

I have a system with 2 nos 2 port valves.

The actuator heads are Sunvic, motor open and motor closed 5 wire type, rather than actuators that use a spring in one direction (presumably to close) and I guess only have 3 wires.

Does anyone have any preference from experience for one type over the other and if so which make is thought to be most reliable?

The reason I ak is that I am contemplating the use of a Vaillant Control Centre VR 65 when I upgrade my Boiler later in the year and looking at their install details and having spoken to their Tech people the VR65 doesn't support the 5 wire valve, so I'll either have to change the actuators and valves or the controls manufacturer.

 

[clf-gas]

You seem to have done the research and found the answer from manufacturer. GO for the three wire

 

[Disk]

I may do that but was looking for some feedback on experience and relaibility of the different makes.

 

[gas4you]

I only ever use Danfoss or Honeywell valves.

The VR65 control center only uses the synchron motor live & neutral. The EBUS system takes care of the rest so the microswitch is redundant.