In article ,
Andy Hall wrote:
That is the point, it is cheap to install, with no zone valves, etc.

Zone valves are hardly expensive, are they?

'Zone valves, etc' require a basic understanding of electricity to
install. Guess why our resident 'expert' doesn't like them...

--
*Don't use no double negatives *

Dave Plowman London SW 12
RIP Acorn