Synchronous Motors - Hot Water No CH Poterton Neataheat Profile 30e - 80e?

Hi,

Further to my recent (and ongoing since Oct/Nov 2009!!) Answer/Post/update - under title; 'Hot Water But No CH Poterton Neataheat Profile 30e-80e' (in which I also included the more detailed versions of these questions) I would love to know the following;

Has anyone had any experience of Cal-Chem vs Fernox (I have used Fernox in the past, yet the Cal-Chem product seems to cover more bases/uses and appears to be a littl more cost effective)?;

Do Synchronous Motors come with 'End Switches' and is it worth replacing just the motor if it comes with such - as it appears that it is just the 'End Switches' which are faulty (our motor works okay, yet the whole 3 Port Valve is over 20 years old so may be more cost effective to change the whole unit etc. becuase of the intermittent nature of the fault and draining down etc. etc...)?;

Are Gated Pump Valves better than Ball Pump Valves or vice versa (i.e. the isolating/shut off valves which isolate the Pump). I have used ball-valves on other applications with good success, yet some Plumbers have mentioned to me that they would not use ball-valves for the Pump application?

Many thanks in anticipation.

Regards,