One more question, do motorized valves produce a full shut off, such that if
I use a motorized zone valve on the flow and a ball valve on the return I
can isolate a section of the CH circuit?

Fash

"Christian McArdle" wrote in message
. net...
Can they also be used as a mains stop cock?

Yes. Use 1/4 turn full bore lever valves for everything, except for
isolating low flow appliances such as washing machines and basin taps,
which
can use cheap reduced bore isolating valves.

Christian.