"Ed Sirett" wrote in message
...
IMM wrote:

"Ed Sirett" wrote in message
...

If you decide to go the 3 port way - be strongly advised that the
diveter valve variant (either but not both CH and HW) - has been found
wanting by many.

This new to me. A 3 port diverter is as simple as a two port. They use
the
same heads.


I don't mean to imply that there was a reliability issue. As you say the
heads are the same as a two port unit. What I mean is that people are
unhappy with a system that cannot simutaneously run the heating and the
water!
More than once I have been asked to 'fix' a system with a diverter valve
that the owners perceived as broken, and as you know, the customer is
always right.

I assume they have old fashioned British Standard pig of a cylinder and not
a quick recovery. If they had a quick recovery they would not complain as
they would not notice the heating has been off for a few minutes or so.


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